Load Specifications
Bullet:.257 | 95gr | Hornady ELD-VT
Bullet Manufacturer:Hornady
Bullet Weight:95 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:1:11.0
Load data in caliber .257 Weath. Mag. with .257 | 95gr | Hornady ELD-VT bullet and 150 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP and Vihtavuori N560.
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 3100 | <<locked>> | 94% | 55,259 psi | 87% | 3389 fps | 99.9% |
| Accurate 3100 | <<locked>> | 94% | 54,998 psi | 86% | 3386 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 55,999 psi | 88% | 3435 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,014 psi | 88% | 3435 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,637 psi | 89% | 3553 fps | 98.2% |
| Accurate High Country | <<locked>> | 92% | 56,391 psi | 88% | 3550 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 92% | 53,751 psi | 84% | 3478 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 94% | 57,667 psi | 90% | 3553 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 56,869 psi | 89% | 3402 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 56,608 psi | 89% | 3399 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,000 psi | 89% | 3494 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 92% | 57,014 psi | 89% | 3494 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 94% | 54,955 psi | 86% | 3491 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 94% | 54,723 psi | 86% | 3488 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 3360 fps | 96.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,153 psi | 77% | 3353 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,150 psi | 69% | 3307 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,976 psi | 69% | 3304 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,043 psi | 89% | 3484 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,305 psi | 90% | 3491 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,043 psi | 89% | 3484 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,811 psi | 89% | 3504 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,855 psi | 89% | 3504 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,433 psi | 85% | 3455 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,186 psi | 85% | 3455 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,579 psi | 89% | 3478 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,391 psi | 88% | 3474 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,027 psi | 86% | 3488 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,781 psi | 86% | 3481 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,173 psi | 88% | 3465 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,941 psi | 88% | 3461 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3524 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3520 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,927 psi | 89% | 3563 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,666 psi | 89% | 3560 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 54,157 psi | 85% | 3468 fps | 98.6% |
| Bofors RP15 | <<locked>> | 98% | 57,566 psi | 90% | 3530 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 3442 fps | 97.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 3438 fps | 97.7% |
| Bofors RP5 | <<locked>> | 94% | 55,027 psi | 86% | 3488 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 54,781 psi | 86% | 3481 fps | 98.8% |
| Bofors RP7 | <<locked>> | 84% | 54,897 psi | 86% | 3379 fps | 99.2% |
| Bofors RP7 | <<locked>> | 84% | 54,679 psi | 86% | 3373 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3468 fps | 98.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3465 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 54,128 psi | 85% | 3428 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 86% | 57,696 psi | 90% | 3494 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,782 psi | 89% | 3448 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 84% | 56,536 psi | 89% | 3445 fps | 99% |
| Hodgdon H4831 | <<locked>> | 92% | 54,926 psi | 86% | 3422 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 54,723 psi | 86% | 3419 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,566 psi | 90% | 3471 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,334 psi | 90% | 3465 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,217 psi | 90% | 3412 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,217 psi | 90% | 3412 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,534 psi | 85% | 3596 fps | 99.6% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3593 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 84% | 54,621 psi | 86% | 3465 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 84% | 54,404 psi | 85% | 3461 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 2231 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 58% | 2228 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,623 psi | 89% | 3419 fps | 99.5% |
| IMR 4350 | <<locked>> | 88% | 56,405 psi | 88% | 3415 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,318 psi | 88% | 3409 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,101 psi | 88% | 3402 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 56,536 psi | 89% | 3428 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,289 psi | 88% | 3422 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,738 psi | 87% | 3406 fps | 97.4% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,811 psi | 87% | 3406 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 96% | 56,579 psi | 89% | 3533 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 56,333 psi | 88% | 3527 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 56,956 psi | 89% | 3406 fps | 100% |
| Lovex S065 | <<locked>> | 86% | 56,739 psi | 89% | 3402 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,201 psi | 87% | 3396 fps | 99.6% |
| Lovex S070 | <<locked>> | 86% | 54,984 psi | 86% | 3392 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 3409 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 3406 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 53,954 psi | 85% | 3412 fps | 98.4% |
| Norma 204 | <<locked>> | 88% | 57,551 psi | 90% | 3478 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 39,668 psi | 62% | 3212 fps | 96.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,465 psi | 62% | 3209 fps | 96.4% |
| Norma MRP | <<locked>> | 92% | 54,839 psi | 86% | 3514 fps | 99.6% |
| Norma MRP | <<locked>> | 92% | 54,607 psi | 86% | 3504 fps | 99.6% |
| Norma URP | <<locked>> | 86% | 54,578 psi | 86% | 3419 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,346 psi | 85% | 3415 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,464 psi | 90% | 3556 fps | 98.6% |
| Ramshot Grand | <<locked>> | 96% | 57,522 psi | 90% | 3553 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 57,246 psi | 90% | 3481 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 57,043 psi | 89% | 3478 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 56,130 psi | 88% | 3478 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 98% | 55,912 psi | 88% | 3471 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 59% | 2283 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 59% | 2280 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,667 psi | 90% | 3507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,217 psi | 88% | 3458 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,231 psi | 88% | 3458 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,534 psi | 85% | 3488 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,302 psi | 85% | 3484 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3599 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3593 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 56,115 psi | 88% | 3386 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 55,825 psi | 87% | 3383 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,534 psi | 85% | 3392 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 90% | 54,549 psi | 85% | 3392 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 92% | 56,072 psi | 88% | 3468 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 55,869 psi | 88% | 3465 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 84% | 54,897 psi | 86% | 3379 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 54,679 psi | 86% | 3373 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,956 psi | 89% | 3406 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,739 psi | 89% | 3402 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,201 psi | 87% | 3396 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 86% | 54,984 psi | 86% | 3392 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,725 psi | 90% | 3451 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,493 psi | 90% | 3445 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,811 psi | 87% | 3245 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,564 psi | 87% | 3241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,347 psi | 88% | 3350 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,101 psi | 88% | 3343 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,637 psi | 87% | 3461 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,434 psi | 87% | 3458 fps | 98.8% |
| Somchem S355 | <<locked>> | 82% | 55,564 psi | 87% | 3379 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 55,593 psi | 87% | 3379 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,362 psi | 88% | 3379 fps | 97.4% |
| Somchem S361 | <<locked>> | 90% | 56,144 psi | 88% | 3376 fps | 97.4% |
| Somchem S365 | <<locked>> | 88% | 55,114 psi | 86% | 3425 fps | 100% |
| Somchem S365 | <<locked>> | 88% | 54,839 psi | 86% | 3419 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,594 psi | 89% | 3435 fps | 99.5% |
| Somchem S385 | <<locked>> | 92% | 56,637 psi | 89% | 3432 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 56,971 psi | 89% | 3346 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 56,971 psi | 89% | 3346 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,173 psi | 88% | 3409 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,173 psi | 88% | 3409 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,289 psi | 88% | 3409 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 96% | 56,057 psi | 88% | 3402 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 86% | 55,579 psi | 87% | 3412 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 55,347 psi | 87% | 3409 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,694 psi | 86% | 3438 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,433 psi | 85% | 3432 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,650 psi | 86% | 3501 fps | 97.3% |
| Vihtavuori N560 | <<locked>> | 92% | 54,418 psi | 85% | 3497 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 98% | 54,752 psi | 86% | 3474 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 98% | 54,534 psi | 85% | 3468 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,101 psi | 88% | 3356 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,854 psi | 88% | 3353 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,128 psi | 85% | 3428 fps | 99.5% |
| Winchester 760 | <<locked>> | 84% | 54,172 psi | 85% | 3428 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,041 psi | 85% | 3550 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,795 psi | 84% | 3547 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,768 psi | 89% | 3428 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,536 psi | 89% | 3422 fps | 98.9% |
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 3100 | <<locked>> | 80% | 33,968 psi | 53% | 2923 fps | 95.7% |
| Accurate 3100 | <<locked>> | 80% | 33,779 psi | 53% | 2920 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 45,571 psi | 71% | 3241 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 45,339 psi | 71% | 3235 fps | 99.7% |
| Accurate High Country | <<locked>> | 86% | 45,818 psi | 72% | 3330 fps | 95.7% |
| Accurate High Country | <<locked>> | 86% | 45,585 psi | 71% | 3323 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 90% | 50,067 psi | 78% | 3402 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 90% | 49,879 psi | 78% | 3399 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,417 psi | 84% | 3343 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 53,185 psi | 83% | 3337 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,596 psi | 64% | 3146 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 82% | 40,596 psi | 64% | 3146 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 44,657 psi | 70% | 3271 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 47,718 psi | 75% | 3343 fps | 96% |
| ADI AR 2217 | <<locked>> | 98% | 46,137 psi | 72% | 3287 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 45,992 psi | 72% | 3284 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 36,114 psi | 57% | 3084 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 36,100 psi | 57% | 3084 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,944 psi | 64% | 3146 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,959 psi | 64% | 3146 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,944 psi | 64% | 3146 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,526 psi | 68% | 3248 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,323 psi | 68% | 3245 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,459 psi | 79% | 3386 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,430 psi | 79% | 3389 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,567 psi | 64% | 3136 fps | 95.2% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,553 psi | 64% | 3136 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,698 psi | 65% | 3202 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,698 psi | 65% | 3202 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,489 psi | 51% | 2959 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,460 psi | 51% | 2956 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,503 psi | 51% | 2976 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,343 psi | 51% | 2969 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,694 psi | 56% | 3107 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,636 psi | 56% | 3104 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 41,321 psi | 65% | 3192 fps | 95.4% |
| Bofors RP15 | <<locked>> | 88% | 41,133 psi | 64% | 3186 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 41,974 psi | 66% | 3232 fps | 95% |
| Bofors RP30 | <<locked>> | 96% | 44,715 psi | 70% | 3294 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 41,698 psi | 65% | 3202 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 41,698 psi | 65% | 3202 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 48,182 psi | 76% | 3245 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 48,182 psi | 76% | 3245 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 44,150 psi | 69% | 3245 fps | 96% |
| Hodgdon H1000 | <<locked>> | 94% | 43,976 psi | 69% | 3241 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,210 psi | 74% | 3294 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 80% | 46,978 psi | 74% | 3287 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 49,661 psi | 78% | 3314 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 49,661 psi | 78% | 3314 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 88% | 47,718 psi | 75% | 3278 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 88% | 47,529 psi | 74% | 3274 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,862 psi | 73% | 3258 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,644 psi | 73% | 3255 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,060 psi | 64% | 3114 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,843 psi | 64% | 3107 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,740 psi | 61% | 3209 fps | 95.2% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,537 psi | 60% | 3205 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 46,992 psi | 74% | 3314 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,760 psi | 73% | 3307 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 2005 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,729 psi | 69% | 3163 fps | 97.3% |
| IMR 4350 | <<locked>> | 80% | 43,555 psi | 68% | 3156 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,574 psi | 78% | 3278 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,371 psi | 77% | 3274 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 43,279 psi | 68% | 3176 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 43,076 psi | 68% | 3169 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,093 psi | 72% | 3209 fps | 95.1% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,890 psi | 72% | 3205 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 45,847 psi | 72% | 3310 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 90% | 45,861 psi | 72% | 3310 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,108 psi | 74% | 3222 fps | 99.3% |
| Lovex S065 | <<locked>> | 80% | 47,094 psi | 74% | 3219 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 45,397 psi | 71% | 3199 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 45,368 psi | 71% | 3199 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 33,344 psi | 52% | 2907 fps | 95.4% |
| Lovex S071 | <<locked>> | 84% | 33,156 psi | 52% | 2900 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 43,801 psi | 69% | 3199 fps | 96% |
| Norma 204 | <<locked>> | 80% | 43,584 psi | 68% | 3192 fps | 96% |
| Norma 217 | <<locked>> | 98% | 37,072 psi | 58% | 3140 fps | 95.4% |
| Norma 217 | <<locked>> | 98% | 36,869 psi | 58% | 3136 fps | 95.3% |
| Norma MRP | 62.1 gr | 82% | 38,072 psi | 60% | 3140 fps | 95.9% |
| Norma MRP | 62.1 gr | 82% | 38,058 psi | 60% | 3140 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 44,512 psi | 70% | 3222 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 44,527 psi | 70% | 3222 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 45,977 psi | 72% | 3323 fps | 96.1% |
| Ramshot Grand | <<locked>> | 90% | 45,774 psi | 72% | 3317 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 43,642 psi | 68% | 3212 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 80% | 43,410 psi | 68% | 3205 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 38,218 psi | 60% | 3097 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 88% | 38,247 psi | 60% | 3097 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 44% | 2051 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,592 psi | 84% | 3442 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,658 psi | 72% | 3261 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,411 psi | 71% | 3255 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,845 psi | 69% | 3271 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,642 psi | 68% | 3268 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,766 psi | 56% | 3107 fps | 95.1% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,592 psi | 56% | 3104 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 52,359 psi | 82% | 3323 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 52,359 psi | 82% | 3323 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,802 psi | 70% | 3192 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 84% | 44,788 psi | 70% | 3189 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 39,929 psi | 63% | 3120 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 82% | 39,740 psi | 62% | 3117 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 48,182 psi | 76% | 3245 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,182 psi | 76% | 3245 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,108 psi | 74% | 3222 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,094 psi | 74% | 3219 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 45,397 psi | 71% | 3199 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 80% | 45,368 psi | 71% | 3199 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,998 psi | 85% | 3386 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,737 psi | 84% | 3383 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,388 psi | 82% | 3192 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,359 psi | 82% | 3192 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,180 psi | 72% | 3156 fps | 98.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,166 psi | 72% | 3153 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,581 psi | 62% | 3117 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,337 psi | 66% | 3182 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 52,228 psi | 82% | 3320 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 52,199 psi | 82% | 3320 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,211 psi | 77% | 3241 fps | 95.8% |
| Somchem S361 | <<locked>> | 86% | 49,023 psi | 77% | 3238 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 41,655 psi | 65% | 3176 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 41,437 psi | 65% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,869 psi | 59% | 3035 fps | 95.4% |
| Somchem S385 | <<locked>> | 80% | 37,869 psi | 59% | 3035 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 49,951 psi | 78% | 3228 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 49,937 psi | 78% | 3228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,108 psi | 72% | 3222 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 45,876 psi | 72% | 3215 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 40,118 psi | 63% | 3077 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 86% | 40,118 psi | 63% | 3077 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,440 psi | 71% | 3219 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 80% | 45,455 psi | 71% | 3219 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 36,405 psi | 57% | 3048 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 36,376 psi | 57% | 3048 fps | 98.5% |
| Vihtavuori N560 | 66.6 gr | 88% | 47,485 psi | 74% | 3350 fps | 95.5% |
| Vihtavuori N560 | 66.6 gr | 88% | 47,297 psi | 74% | 3346 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 47,616 psi | 75% | 3327 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 94% | 47,384 psi | 74% | 3323 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,353 psi | 71% | 3173 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,165 psi | 71% | 3169 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,427 psi | 74% | 3297 fps | 98.5% |
| Winchester 760 | <<locked>> | 80% | 47,181 psi | 74% | 3291 fps | 98.5% |
| Winchester StaBALL HD | 59.9 gr | 80% | 28,993 psi | 45% | 2953 fps | 98.5% |
| Winchester StaBALL HD | 59.9 gr | 80% | 28,848 psi | 45% | 2946 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,929 psi | 63% | 3081 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 86% | 42,670 psi | 67% | 3146 fps | 95.9% |
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 150 powders for .257 Weath. Mag. loaded with the .257 | 95gr | Hornady ELD-VT. ReloadSwiss RS 76 delivers the highest muzzle velocity at 3,599 fps; across all powders the maximum-charge window runs from 2,228 fps to 3,599 fps. ADI AR 2217 gives the best case fill at 100 %, and 150 of the 150 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 95.0 gr projectile in 0.257" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2217, ADI AR 2225 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. Winchester StaBALL HD, Norma MRP, Vihtavuori N560 rank at the top here: for .257 Weath. Mag. with the .257 | 95gr | Hornady ELD-VT 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.