Load Specifications
Bullet Manufacturer:Cutting Edge
Bullet Weight:82 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.257 Weath. Mag. load data
Case Length (l3):2.549"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:84 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:7.5
Load data in caliber .257 Weath. Mag. with .257 | 82gr | CutEdge ESP Raptor bullet and 181 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand and Alliant Reloder-16.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,360 psi | 85% | 3471 fps | 100% |
| Accurate 2495 | <<locked>> | 82% | 55,317 psi | 87% | 3491 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,505 psi | 85% | 3488 fps | 97.8% |
| Accurate 2700 | <<locked>> | 84% | 57,479 psi | 90% | 3573 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3579 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 3606 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 55,114 psi | 86% | 3537 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,999 psi | 88% | 3556 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,884 psi | 89% | 3655 fps | 99.9% |
| Accurate 4350 | <<locked>> | 90% | 53,998 psi | 85% | 3609 fps | 99.8% |
| Accurate High Country | <<locked>> | 96% | 54,114 psi | 85% | 3701 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 55,680 psi | 87% | 3579 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,463 psi | 88% | 3599 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,505 psi | 85% | 3632 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 96% | 55,680 psi | 87% | 3658 fps | 97.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 3688 fps | 96.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3720 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,303 psi | 87% | 3720 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,478 psi | 89% | 3743 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,752 psi | 86% | 3629 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,912 psi | 88% | 3655 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,565 psi | 89% | 3606 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,363 psi | 90% | 3625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,768 psi | 89% | 3635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,595 psi | 90% | 3655 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,143 psi | 85% | 3665 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,201 psi | 87% | 3688 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,434 psi | 87% | 3688 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,797 psi | 89% | 3717 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,998 psi | 85% | 3615 fps | 97% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,129 psi | 86% | 3642 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3681 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3711 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3606 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3632 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,136 psi | 71% | 3494 fps | 98.4% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,137 psi | 72% | 3524 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,782 psi | 89% | 3773 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,606 psi | 84% | 3714 fps | 99.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,386 psi | 79% | 3579 fps | 96.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,547 psi | 81% | 3606 fps | 96.7% |
| Bofors RP3 | <<locked>> | 86% | 57,537 psi | 90% | 3622 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 54,766 psi | 86% | 3579 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3681 fps | 97.5% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3711 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 56,971 psi | 89% | 3602 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 54,215 psi | 85% | 3553 fps | 98% |
| Hodgdon H380 | <<locked>> | 84% | 54,070 psi | 85% | 3573 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 55,114 psi | 86% | 3596 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 88% | 57,014 psi | 89% | 3675 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,565 psi | 89% | 3671 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 56,869 psi | 89% | 3635 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 88% | 55,941 psi | 88% | 3625 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,418 psi | 85% | 3570 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,492 psi | 87% | 3593 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,782 psi | 87% | 3625 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,579 psi | 89% | 3645 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,405 psi | 88% | 3684 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 90% | 57,580 psi | 90% | 3711 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 57% | 2352 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,230 psi | 57% | 2362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,216 psi | 87% | 3576 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,826 psi | 89% | 3609 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,186 psi | 85% | 3550 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,302 psi | 85% | 3547 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,898 psi | 88% | 3583 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,927 psi | 89% | 3586 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,042 psi | 86% | 3556 fps | 98.6% |
| IMR 4350 | <<locked>> | 92% | 54,752 psi | 86% | 3570 fps | 98.1% |
| IMR 4350 | <<locked>> | 92% | 55,666 psi | 87% | 3589 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,085 psi | 86% | 3570 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,999 psi | 88% | 3593 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 54,723 psi | 86% | 3596 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 54,679 psi | 86% | 3599 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 54,520 psi | 85% | 3602 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,347 psi | 87% | 3625 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,696 psi | 90% | 3612 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3678 fps | 96.1% |
| Lovex S060 | <<locked>> | 82% | 56,333 psi | 88% | 3550 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 57,130 psi | 90% | 3566 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,143 psi | 86% | 3553 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,970 psi | 88% | 3570 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,201 psi | 87% | 3563 fps | 99.3% |
| Lovex S065 | <<locked>> | 90% | 56,130 psi | 88% | 3586 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 56,550 psi | 89% | 3609 fps | 98.9% |
| Lovex S070 | <<locked>> | 92% | 57,522 psi | 90% | 3629 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,426 psi | 71% | 3386 fps | 97.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,586 psi | 73% | 3415 fps | 98% |
| Norma 201 | <<locked>> | 82% | 56,144 psi | 88% | 3566 fps | 100% |
| Norma 201 | <<locked>> | 82% | 57,000 psi | 89% | 3586 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,290 psi | 90% | 3570 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,043 psi | 88% | 3619 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,855 psi | 89% | 3635 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,695 psi | 87% | 3625 fps | 97.2% |
| Norma 204 | <<locked>> | 92% | 56,898 psi | 89% | 3655 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 54,955 psi | 86% | 3707 fps | 98.6% |
| Norma MRP | <<locked>> | 98% | 56,449 psi | 88% | 3740 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 55,535 psi | 87% | 3638 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 56,536 psi | 89% | 3658 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 57,377 psi | 90% | 3642 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,404 psi | 85% | 3596 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3691 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 92% | 54,665 psi | 86% | 3629 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 55,854 psi | 88% | 3655 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,187 psi | 86% | 3638 fps | 98.2% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,661 psi | 78% | 3537 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 57% | 2405 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 58% | 2415 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,172 psi | 85% | 3550 fps | 98.8% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,129 psi | 86% | 3573 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,882 psi | 86% | 3684 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,014 psi | 88% | 3707 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,319 psi | 90% | 3678 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,462 psi | 85% | 3632 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,941 psi | 88% | 3711 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,145 psi | 90% | 3740 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,483 psi | 70% | 3507 fps | 96.5% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,759 psi | 72% | 3550 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 84% | 57,058 psi | 89% | 3573 fps | 100% |
| Rottweil R 902 | <<locked>> | 82% | 54,215 psi | 85% | 3530 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,624 psi | 90% | 3619 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,882 psi | 86% | 3576 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,347 psi | 88% | 3599 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 96% | 57,203 psi | 90% | 3622 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 57,029 psi | 89% | 3668 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 54,288 psi | 85% | 3622 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,971 psi | 89% | 3602 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,215 psi | 85% | 3553 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,201 psi | 87% | 3563 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,130 psi | 88% | 3586 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 55,143 psi | 86% | 3553 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,970 psi | 88% | 3570 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,550 psi | 89% | 3609 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 57,522 psi | 90% | 3629 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,825 psi | 87% | 3622 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,811 psi | 89% | 3645 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,376 psi | 88% | 3599 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,421 psi | 90% | 3622 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,072 psi | 89% | 3494 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,795 psi | 86% | 3432 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,608 psi | 87% | 3451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,013 psi | 86% | 3504 fps | 98.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,927 psi | 88% | 3527 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,550 psi | 89% | 3661 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,853 psi | 84% | 3615 fps | 97.3% |
| Somchem S335 | <<locked>> | 82% | 56,666 psi | 89% | 3481 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 57,464 psi | 90% | 3501 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,377 psi | 90% | 3612 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,694 psi | 86% | 3573 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,274 psi | 87% | 3642 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,376 psi | 88% | 3661 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,580 psi | 90% | 3635 fps | 98.5% |
| Somchem S385 | <<locked>> | 96% | 54,911 psi | 86% | 3593 fps | 98.2% |
| Unknown powder | <<locked>> | 90% | 56,043 psi | 88% | 3642 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 84% | 57,043 psi | 89% | 3471 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,363 psi | 90% | 3524 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 54,766 psi | 86% | 3488 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,043 psi | 89% | 3530 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,216 psi | 87% | 3501 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,637 psi | 87% | 3533 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,391 psi | 88% | 3543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,623 psi | 89% | 3606 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 54,926 psi | 86% | 3586 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 3494 fps | 97.1% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3560 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 57,000 psi | 89% | 3556 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 57,159 psi | 90% | 3547 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,145 psi | 90% | 3665 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 90% | 54,244 psi | 85% | 3589 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 54,360 psi | 85% | 3635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,390 psi | 87% | 3658 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,536 psi | 89% | 3727 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,172 psi | 85% | 3527 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,274 psi | 87% | 3543 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,014 psi | 89% | 3675 fps | 98.8% |
| Winchester 760 | <<locked>> | 90% | 56,840 psi | 89% | 3678 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,572 psi | 75% | 3661 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,342 psi | 77% | 3694 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,667 psi | 90% | 3625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,144 psi | 88% | 3596 fps | 97.4% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,492 psi | 87% | 3586 fps | 97.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 50,908 psi | 80% | 3415 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 51,895 psi | 81% | 3435 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,237 psi | 69% | 3278 fps | 95.4% |
| Accurate 2700 | <<locked>> | 80% | 49,966 psi | 78% | 3428 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 38,435 psi | 60% | 3219 fps | 95.5% |
| Accurate 3100 | <<locked>> | 90% | 39,305 psi | 62% | 3245 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 48,254 psi | 76% | 3419 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 49,168 psi | 77% | 3438 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,767 psi | 58% | 3215 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 37,565 psi | 59% | 3241 fps | 96.9% |
| Accurate High Country | <<locked>> | 94% | 50,183 psi | 79% | 3615 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 45,977 psi | 72% | 3389 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,543 psi | 73% | 3402 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 47,630 psi | 75% | 3484 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 92% | 48,486 psi | 76% | 3510 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 52,388 psi | 82% | 3609 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 98% | 53,403 psi | 84% | 3638 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,256 psi | 80% | 3642 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,373 psi | 82% | 3668 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,703 psi | 75% | 3481 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 48,805 psi | 76% | 3510 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,369 psi | 73% | 3415 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,210 psi | 74% | 3435 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,603 psi | 78% | 3497 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,430 psi | 79% | 3520 fps | 99.8% |
| Alliant Reloder-16 | 54.9 gr | 80% | 35,897 psi | 56% | 3232 fps | 96.5% |
| Alliant Reloder-16 | 54.9 gr | 80% | 36,593 psi | 57% | 3258 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,176 psi | 65% | 3396 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,148 psi | 66% | 3422 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,094 psi | 74% | 3468 fps | 95.3% |
| Alliant Reloder-19 | <<locked>> | 92% | 48,211 psi | 76% | 3497 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 47,906 psi | 75% | 3527 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,716 psi | 72% | 3484 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,950 psi | 47% | 3045 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 84% | 30,516 psi | 48% | 3068 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,898 psi | 58% | 3271 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 37,594 psi | 59% | 3297 fps | 96% |
| Alliant Reloder-26 | 65.2 gr | 86% | 35,244 psi | 55% | 3268 fps | 95.6% |
| Alliant Reloder-26 | 65.2 gr | 86% | 36,245 psi | 57% | 3301 fps | 96.3% |
| Bofors RP15 | <<locked>> | 98% | 46,963 psi | 74% | 3504 fps | 95.3% |
| Bofors RP15 | <<locked>> | 98% | 48,080 psi | 75% | 3533 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,688 psi | 73% | 3422 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 47,514 psi | 74% | 3445 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 47,906 psi | 75% | 3527 fps | 95.7% |
| Bofors RP5 | <<locked>> | 94% | 45,716 psi | 72% | 3484 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 43,714 psi | 69% | 3323 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 44,411 psi | 70% | 3343 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,137 psi | 74% | 3428 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,950 psi | 75% | 3455 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,612 psi | 67% | 3369 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 82% | 42,743 psi | 67% | 3376 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 46,978 psi | 74% | 3435 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 45,687 psi | 72% | 3409 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,431 psi | 52% | 3104 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,171 psi | 54% | 3130 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,617 psi | 76% | 3494 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,678 psi | 83% | 3576 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 44,643 psi | 70% | 3442 fps | 96% |
| Hodgdon Superformance | <<locked>> | 82% | 42,250 psi | 66% | 3386 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 42% | 2113 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 42% | 2123 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,486 psi | 76% | 3448 fps | 99.9% |
| Hodgdon VARGET | <<locked>> | 80% | 53,200 psi | 83% | 3543 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,720 psi | 79% | 3488 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,904 psi | 70% | 3356 fps | 99.2% |
| IMR 4064 | <<locked>> | 80% | 48,936 psi | 77% | 3451 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,077 psi | 69% | 3314 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,329 psi | 80% | 3481 fps | 97.9% |
| IMR 4350 | <<locked>> | 86% | 44,817 psi | 70% | 3360 fps | 95.7% |
| IMR 4350 | <<locked>> | 84% | 42,772 psi | 67% | 3317 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,467 psi | 67% | 3294 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,163 psi | 68% | 3317 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 34,258 psi | 54% | 3127 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 36,071 psi | 57% | 3179 fps | 96.5% |
| IMR 4895 | <<locked>> | 80% | 50,937 psi | 80% | 3533 fps | 99.9% |
| IMR 4895 | <<locked>> | 80% | 51,779 psi | 81% | 3556 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,969 psi | 85% | 3543 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 50,981 psi | 80% | 3599 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 52,997 psi | 83% | 3491 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,824 psi | 84% | 3507 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,428 psi | 76% | 3428 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,269 psi | 77% | 3448 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,856 psi | 62% | 3228 fps | 96.2% |
| Lovex S065 | <<locked>> | 80% | 40,582 psi | 64% | 3251 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 40,814 psi | 64% | 3268 fps | 95.3% |
| Lovex S070 | <<locked>> | 82% | 41,510 psi | 65% | 3291 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 39,639 psi | 62% | 3248 fps | 95.9% |
| Lovex S071 | <<locked>> | 94% | 37,913 psi | 59% | 3209 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,750 psi | 83% | 3507 fps | 100% |
| Norma 201 | <<locked>> | 80% | 53,606 psi | 84% | 3527 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,563 psi | 84% | 3507 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,979 psi | 77% | 3481 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 49,806 psi | 78% | 3504 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 48,254 psi | 76% | 3474 fps | 95.3% |
| Norma 204 | <<locked>> | 88% | 49,371 psi | 77% | 3504 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 44,019 psi | 69% | 3471 fps | 96.1% |
| Norma MRP | <<locked>> | 90% | 41,843 psi | 66% | 3419 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,767 psi | 58% | 3215 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 37,492 psi | 59% | 3241 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 49,661 psi | 78% | 3501 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 80% | 50,662 psi | 79% | 3524 fps | 99.9% |
| Ramshot Grand | 71.5 gr | 98% | 51,329 psi | 80% | 3615 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 82% | 38,363 psi | 60% | 3261 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 82% | 39,233 psi | 61% | 3287 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 94% | 43,062 psi | 67% | 3379 fps | 95% |
| Ramshot Magnum | <<locked>> | 96% | 42,395 psi | 66% | 3369 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 43% | 2165 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 43% | 2172 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,224 psi | 74% | 3409 fps | 97.5% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,153 psi | 75% | 3435 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,830 psi | 69% | 3471 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,846 psi | 70% | 3494 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,724 psi | 58% | 3232 fps | 96.2% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,652 psi | 59% | 3258 fps | 96.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,882 psi | 56% | 3235 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,666 psi | 57% | 3264 fps | 95.9% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,423 psi | 65% | 3422 fps | 95.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,221 psi | 66% | 3455 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,082 psi | 78% | 3445 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 50,952 psi | 80% | 3468 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,801 psi | 69% | 3353 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 44,657 psi | 70% | 3376 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 52,620 psi | 82% | 3530 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 94% | 53,447 psi | 84% | 3553 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 92% | 46,079 psi | 72% | 3448 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 47,224 psi | 74% | 3474 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 43,714 psi | 69% | 3323 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 44,411 psi | 70% | 3343 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,856 psi | 62% | 3228 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,582 psi | 64% | 3251 fps | 96.6% |
| Shooters World Precision | <<locked>> | 80% | 48,428 psi | 76% | 3428 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 49,269 psi | 77% | 3448 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,814 psi | 64% | 3268 fps | 95.3% |
| Shooters World SW4350 | <<locked>> | 82% | 41,510 psi | 65% | 3291 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,295 psi | 71% | 3419 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,079 psi | 72% | 3438 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,808 psi | 83% | 3533 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,577 psi | 84% | 3553 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,548 psi | 84% | 3438 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,223 psi | 71% | 3268 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,832 psi | 72% | 3281 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,858 psi | 66% | 3225 fps | 95.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,697 psi | 62% | 3179 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 45,658 psi | 72% | 3438 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,804 psi | 73% | 3471 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 53,359 psi | 84% | 3428 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 54,157 psi | 85% | 3448 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,164 psi | 69% | 3356 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 44,976 psi | 70% | 3376 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 33,141 psi | 52% | 3153 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 33,910 psi | 53% | 3179 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 43,714 psi | 69% | 3353 fps | 95.4% |
| Somchem S385 | <<locked>> | 90% | 44,556 psi | 70% | 3376 fps | 95.8% |
| Unknown powder | <<locked>> | 80% | 39,726 psi | 62% | 3291 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 80% | 50,546 psi | 79% | 3363 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,415 psi | 79% | 3412 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,126 psi | 80% | 3425 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,082 psi | 78% | 3412 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,692 psi | 81% | 3442 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,768 psi | 59% | 3166 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 42,989 psi | 67% | 3291 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 39,755 psi | 62% | 3255 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 80% | 38,928 psi | 61% | 3245 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 44,802 psi | 70% | 3356 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 94% | 44,266 psi | 69% | 3350 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,937 psi | 78% | 3435 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 49,995 psi | 78% | 3425 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,437 psi | 63% | 3307 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 38,406 psi | 60% | 3238 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 84% | 33,112 psi | 52% | 3136 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 82% | 31,647 psi | 50% | 3094 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 96% | 52,504 psi | 82% | 3645 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,652 psi | 59% | 3182 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,421 psi | 60% | 3205 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 42,612 psi | 67% | 3369 fps | 95.6% |
| Winchester 760 | <<locked>> | 82% | 42,946 psi | 67% | 3383 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,442 psi | 45% | 3071 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 29,080 psi | 46% | 3104 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,998 psi | 85% | 3560 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 48,283 psi | 76% | 3442 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,848 psi | 75% | 3438 fps | 95.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 181 powders for .257 Weath. Mag. loaded with the .257 | 82gr | CutEdge ESP Raptor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,773 fps; across all powders the maximum-charge window runs from 2,352 fps to 3,773 fps. Accurate 3100 gives the best case fill at 100 %, and 181 of the 181 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 82.0 gr projectile in 0.257" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 3100, ADI AR 2213 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, Ramshot Grand, Alliant Reloder-16 rank at the top here: for .257 Weath. Mag. with the .257 | 82gr | CutEdge ESP Raptor they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.