Load Specifications
Load data in caliber .257 Weath. Mag. with .257 | 72gr | CutEdge ESP Raptor bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.
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>> | 84% | 54,505 psi | 85% | 3661 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,824 psi | 86% | 3655 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 3658 fps | 97.8% |
| Accurate 4064 | <<locked>> | 86% | 55,027 psi | 86% | 3724 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,565 psi | 89% | 3822 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 82% | 54,534 psi | 85% | 3760 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 88% | 56,028 psi | 88% | 3763 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,797 psi | 89% | 3766 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,216 psi | 87% | 3901 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,579 psi | 89% | 3789 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,869 psi | 89% | 3816 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,522 psi | 90% | 3901 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,230 psi | 87% | 3865 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3845 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,805 psi | 75% | 3688 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 3934 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,940 psi | 86% | 3766 fps | 99.5% |
| Bofors RP3 | <<locked>> | 88% | 57,667 psi | 90% | 3809 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 57,101 psi | 89% | 3770 fps | 97.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,971 psi | 89% | 3789 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,331 psi | 85% | 3750 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 90% | 57,014 psi | 89% | 3845 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 57,000 psi | 89% | 3806 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 82% | 55,129 psi | 86% | 3776 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,940 psi | 85% | 3737 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,869 psi | 88% | 3812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,536 psi | 89% | 3852 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 56% | 2493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,390 psi | 87% | 3760 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,566 psi | 90% | 3796 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,694 psi | 86% | 3734 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,116 psi | 90% | 3757 fps | 97.9% |
| IMR 4350 | <<locked>> | 94% | 54,824 psi | 86% | 3734 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,288 psi | 87% | 3737 fps | 97.5% |
| IMR 4831 | <<locked>> | 98% | 54,215 psi | 85% | 3757 fps | 99.4% |
| IMR 4895 | <<locked>> | 84% | 54,621 psi | 86% | 3786 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 56,797 psi | 89% | 3766 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,665 psi | 86% | 3724 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,000 psi | 89% | 3740 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,129 psi | 86% | 3734 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,172 psi | 86% | 3734 fps | 98.7% |
| Lovex S070 | <<locked>> | 94% | 56,652 psi | 89% | 3776 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 56,550 psi | 89% | 3757 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,377 psi | 90% | 3757 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,115 psi | 88% | 3796 fps | 99.9% |
| Norma 204 | <<locked>> | 94% | 55,825 psi | 87% | 3786 fps | 96% |
| Norma MRPᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3865 fps | 97.7% |
| Norma URP | <<locked>> | 94% | 55,347 psi | 87% | 3806 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 86% | 57,377 psi | 90% | 3819 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 94% | 54,549 psi | 85% | 3793 fps | 98.4% |
| Ramshot TAC | <<locked>> | 82% | 57,348 psi | 90% | 3776 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,305 psi | 90% | 3799 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 57% | 2546 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,447 psi | 85% | 3724 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,751 psi | 84% | 3822 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,534 psi | 85% | 3865 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,985 psi | 89% | 3842 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,999 psi | 88% | 3885 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 56,942 psi | 89% | 3740 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,203 psi | 90% | 3757 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,508 psi | 90% | 3796 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3825 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 92% | 57,101 psi | 89% | 3770 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,172 psi | 86% | 3734 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,665 psi | 86% | 3724 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,129 psi | 86% | 3734 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,652 psi | 89% | 3776 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,811 psi | 87% | 3802 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,086 psi | 88% | 3750 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,826 psi | 89% | 3783 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,667 psi | 90% | 3691 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,071 psi | 86% | 3619 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,390 psi | 87% | 3671 fps | 97.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3816 fps | 96.5% |
| Somchem S335 | <<locked>> | 84% | 57,261 psi | 90% | 3675 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,869 psi | 88% | 3737 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 57,406 psi | 90% | 3793 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,607 psi | 86% | 3809 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3793 fps | 97.6% |
| Unknown powder | <<locked>> | 92% | 55,956 psi | 88% | 3816 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 86% | 57,290 psi | 90% | 3661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,421 psi | 90% | 3717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,348 psi | 90% | 3717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,666 psi | 87% | 3707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,811 psi | 89% | 3780 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 86% | 57,217 psi | 90% | 3743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,014 psi | 89% | 3835 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3793 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,375 psi | 85% | 3698 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,014 psi | 89% | 3845 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,453 psi | 68% | 3727 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,289 psi | 88% | 3750 fps | 96.3% |
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% | 47,340 psi | 74% | 3533 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,630 psi | 75% | 3504 fps | 95% |
| Accurate 3100 | <<locked>> | 94% | 40,814 psi | 64% | 3425 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 44,788 psi | 70% | 3524 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,419 psi | 57% | 3356 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 51,039 psi | 80% | 3691 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 43,134 psi | 68% | 3484 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,200 psi | 83% | 3701 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,558 psi | 75% | 3734 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,207 psi | 68% | 3510 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,528 psi | 73% | 3602 fps | 98.6% |
| Alliant Reloder-16 | 56.4 gr | 82% | 35,882 psi | 56% | 3383 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,058 psi | 60% | 3468 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,925 psi | 85% | 3773 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,589 psi | 50% | 3238 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 90% | 37,811 psi | 59% | 3488 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,981 psi | 80% | 3688 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 43,468 psi | 68% | 3520 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 46,978 psi | 74% | 3553 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,040 psi | 83% | 3720 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,092 psi | 69% | 3524 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 84% | 45,774 psi | 72% | 3602 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 49,908 psi | 78% | 3658 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 51,576 psi | 81% | 3704 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 33,069 psi | 52% | 3241 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,324 psi | 71% | 3596 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 88% | 48,196 psi | 76% | 3678 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 2241 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,513 psi | 71% | 3553 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 47,268 psi | 74% | 3612 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,090 psi | 66% | 3458 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 47,384 psi | 74% | 3550 fps | 95.7% |
| IMR 4350 | <<locked>> | 90% | 48,037 psi | 75% | 3589 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,672 psi | 72% | 3530 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 36,201 psi | 57% | 3333 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 47,718 psi | 75% | 3645 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 53,200 psi | 83% | 3701 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,039 psi | 80% | 3655 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,053 psi | 78% | 3606 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 45,324 psi | 71% | 3533 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 42,569 psi | 67% | 3455 fps | 95.8% |
| Lovex S070 | <<locked>> | 88% | 46,427 psi | 73% | 3560 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 49,516 psi | 78% | 3625 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,198 psi | 79% | 3629 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,890 psi | 72% | 3586 fps | 98.9% |
| Norma 204 | <<locked>> | 92% | 51,851 psi | 81% | 3707 fps | 95% |
| Norma MRP | <<locked>> | 96% | 47,050 psi | 74% | 3698 fps | 95.7% |
| Norma URP | <<locked>> | 84% | 39,059 psi | 61% | 3435 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 46,224 psi | 72% | 3599 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 44,034 psi | 69% | 3563 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 53,606 psi | 84% | 3707 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,461 psi | 84% | 3727 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 42% | 2293 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,280 psi | 69% | 3501 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,140 psi | 79% | 3747 fps | 99.1% |
| ReloadSwiss RS 60 | 59.2 gr | 80% | 40,538 psi | 64% | 3560 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 39,305 psi | 62% | 3451 fps | 95.8% |
| ReloadSwiss RS 70 | 64.6 gr | 86% | 41,481 psi | 65% | 3543 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 80% | 53,287 psi | 84% | 3675 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,021 psi | 74% | 3560 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 40,553 psi | 64% | 3438 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 98% | 52,678 psi | 83% | 3747 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 46,978 psi | 74% | 3553 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 42,569 psi | 67% | 3455 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,039 psi | 80% | 3655 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,324 psi | 71% | 3533 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 46,427 psi | 73% | 3560 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,177 psi | 66% | 3507 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,170 psi | 82% | 3675 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,632 psi | 78% | 3645 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,560 psi | 79% | 3566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,482 psi | 67% | 3383 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,947 psi | 70% | 3451 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,257 psi | 82% | 3740 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,285 psi | 79% | 3553 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,808 psi | 81% | 3661 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 41,133 psi | 64% | 3448 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 30,284 psi | 47% | 3209 fps | 96% |
| Somchem S385 | <<locked>> | 94% | 46,702 psi | 73% | 3573 fps | 95% |
| Unknown powder | <<locked>> | 82% | 39,581 psi | 62% | 3445 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 47,703 psi | 75% | 3494 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,079 psi | 74% | 3537 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,905 psi | 74% | 3530 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,143 psi | 55% | 3255 fps | 98% |
| Vihtavuori N160 | <<locked>> | 80% | 36,898 psi | 58% | 3333 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 46,949 psi | 74% | 3553 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,521 psi | 59% | 3386 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 34,983 psi | 55% | 3346 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,056 psi | 55% | 3255 fps | 97.1% |
| Winchester 760 | <<locked>> | 84% | 45,774 psi | 72% | 3602 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 32,372 psi | 51% | 3353 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,069 psi | 82% | 3668 fps | 95.3% |
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 110 powders for .257 Weath. Mag. loaded with the .257 | 72gr | CutEdge ESP Raptor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,934 fps; across all powders the maximum-charge window runs from 2,493 fps to 3,934 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 72.0 gr projectile in 0.257" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-19 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. ReloadSwiss RS 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .257 Weath. Mag. with the .257 | 72gr | CutEdge ESP Raptor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Bofors RP15, Hodgdon H4831 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.