Load Specifications
Load data in caliber .25 WSSM with .257 | 70gr | Impala LWHV LS bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 1200-R, Hodgdon LEVERevolution and IMR 3031.
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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 56,173 psi | 88% | 3504 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 56,260 psi | 88% | 3589 fps | 96.1% |
| Accurate 2230 | <<locked>> | 82% | 53,882 psi | 84% | 3530 fps | 96.1% |
| Accurate 2460 | <<locked>> | 88% | 55,434 psi | 87% | 3517 fps | 99.5% |
| Accurate 2495 | <<locked>> | 96% | 54,433 psi | 85% | 3517 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 56,463 psi | 88% | 3576 fps | 99.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3599 fps | 99.9% |
| Accurate LT-30 | <<locked>> | 86% | 55,883 psi | 88% | 3445 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 56,231 psi | 88% | 3465 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 94% | 55,100 psi | 86% | 3563 fps | 97% |
| ADI AR 2207 | <<locked>> | 84% | 57,682 psi | 90% | 3501 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 55,709 psi | 87% | 3540 fps | 96.3% |
| ADI AR 2219 | <<locked>> | 86% | 56,420 psi | 88% | 3579 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,418 psi | 85% | 3520 fps | 98% |
| Alliant AR-Comp | <<locked>> | 94% | 56,681 psi | 89% | 3593 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 55,274 psi | 87% | 3648 fps | 97.6% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 3570 fps | 97.9% |
| Alliant Reloder-10x | <<locked>> | 88% | 55,869 psi | 88% | 3527 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 55,709 psi | 87% | 3589 fps | 96.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 3527 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 82% | 55,434 psi | 87% | 3458 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 55,288 psi | 87% | 3422 fps | 100% |
| Bofors RP3ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3593 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 92% | 56,681 psi | 89% | 3514 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 94% | 56,826 psi | 89% | 3612 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 54,491 psi | 85% | 3635 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 88% | 54,868 psi | 86% | 3553 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 88% | 56,318 psi | 88% | 3573 fps | 99.7% |
| Hodgdon H4198 | <<locked>> | 84% | 57,667 psi | 90% | 3504 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 94% | 55,535 psi | 87% | 3579 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 57,464 psi | 90% | 3661 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,432 psi | 54% | 2241 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 56,956 psi | 89% | 3583 fps | 97.8% |
| IMR 3031 | <<locked>> | 96% | 57,305 psi | 90% | 3648 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 55,245 psi | 87% | 3527 fps | 96.5% |
| IMR 4198 | <<locked>> | 88% | 55,622 psi | 87% | 3488 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 57,116 psi | 90% | 3635 fps | 97.5% |
| IMR 8208 XBR | <<locked>> | 92% | 54,418 psi | 85% | 3520 fps | 98% |
| Lovex D073.4 | <<locked>> | 82% | 54,868 psi | 86% | 3530 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 88% | 55,405 psi | 87% | 3517 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 94% | 54,041 psi | 85% | 3543 fps | 99.2% |
| Lovex S060 | <<locked>> | 94% | 55,463 psi | 87% | 3484 fps | 97.1% |
| Lovex S062 | <<locked>> | 98% | 54,810 psi | 86% | 3533 fps | 98.2% |
| Norma 200 | <<locked>> | 84% | 56,492 psi | 89% | 3504 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,418 psi | 85% | 3517 fps | 98.1% |
| Norma 202 | <<locked>> | 96% | 57,537 psi | 90% | 3589 fps | 99.8% |
| Norma 203B | <<locked>> | 98% | 54,853 psi | 86% | 3576 fps | 97% |
| Ramshot Big Game | <<locked>> | 98% | 55,579 psi | 87% | 3596 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,172 psi | 85% | 3543 fps | 96.8% |
| Ramshot X-Terminator | <<locked>> | 90% | 56,449 psi | 88% | 3520 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,693 psi | 54% | 2290 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,201 psi | 85% | 3520 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 55,376 psi | 87% | 3661 fps | 96.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3622 fps | 99% |
| Rottweil R 901 | <<locked>> | 92% | 55,637 psi | 87% | 3524 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 96% | 54,462 psi | 85% | 3504 fps | 98.1% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 3507 fps | 97.1% |
| Shooters World AR Plus | <<locked>> | 82% | 54,868 psi | 86% | 3530 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,041 psi | 85% | 3543 fps | 99.2% |
| Shooters World Precision | <<locked>> | 98% | 54,810 psi | 86% | 3533 fps | 98.2% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 54,549 psi | 85% | 3471 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 56,376 psi | 88% | 3192 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 57,058 psi | 89% | 3583 fps | 99.7% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3570 fps | 96.6% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 56,333 psi | 88% | 3540 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 57,014 psi | 89% | 3583 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 56,130 psi | 88% | 3468 fps | 99.7% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3455 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 56,043 psi | 88% | 3563 fps | 98.6% |
| Somchem S335 | <<locked>> | 94% | 55,550 psi | 87% | 3471 fps | 99.9% |
| Somchem S341 | <<locked>> | 94% | 56,043 psi | 88% | 3540 fps | 97% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3510 fps | 97% |
| Vihtavuori N120 | <<locked>> | 84% | 57,493 psi | 90% | 3435 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 55,941 psi | 88% | 3461 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 55,535 psi | 87% | 3461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 56,072 psi | 88% | 3550 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 54,244 psi | 85% | 3494 fps | 99.7% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 3435 fps | 98% |
| Vihtavuori N530 | <<locked>> | 92% | 54,940 psi | 86% | 3520 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 98% | 56,333 psi | 88% | 3543 fps | 99.7% |
| Winchester 748 | <<locked>> | 94% | 57,261 psi | 90% | 3632 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 96% | 56,478 psi | 89% | 3589 fps | 97.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 39,320 psi | 62% | 3169 fps | 99.2% |
| Accurate 2200 | <<locked>> | 82% | 52,475 psi | 82% | 3517 fps | 95.3% |
| Accurate 2230 | <<locked>> | 80% | 50,299 psi | 79% | 3458 fps | 95.2% |
| Accurate 2460 | <<locked>> | 80% | 42,743 psi | 67% | 3264 fps | 97.7% |
| Accurate 2495 | <<locked>> | 80% | 32,880 psi | 52% | 3045 fps | 98% |
| Accurate 2520 | <<locked>> | 80% | 37,768 psi | 59% | 3182 fps | 95.9% |
| Accurate 4064 | <<locked>> | 82% | 32,924 psi | 52% | 3064 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 47,007 psi | 74% | 3278 fps | 99.4% |
| Accurate LT-32 | <<locked>> | 80% | 47,282 psi | 74% | 3291 fps | 98.2% |
| ADI AR 2206H | <<locked>> | 90% | 49,008 psi | 77% | 3438 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 50,981 psi | 80% | 3389 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 52,431 psi | 82% | 3478 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 46,122 psi | 72% | 3383 fps | 99.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 42,714 psi | 67% | 3271 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 80% | 35,998 psi | 56% | 3186 fps | 99.9% |
| Alliant Power Pro 1200-R | 37.9 gr | 82% | 45,861 psi | 72% | 3448 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 42,975 psi | 67% | 3323 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,063 psi | 69% | 3304 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 49,472 psi | 78% | 3465 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 46,166 psi | 72% | 3461 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 52,170 psi | 82% | 3402 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,803 psi | 72% | 3248 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 42,844 psi | 67% | 3327 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,016 psi | 63% | 3159 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 84% | 40,857 psi | 64% | 3278 fps | 95.5% |
| Hodgdon CFE223 | <<locked>> | 88% | 50,952 psi | 80% | 3566 fps | 95.4% |
| Hodgdon H322 | <<locked>> | 80% | 42,482 psi | 67% | 3301 fps | 98.7% |
| Hodgdon H335 | <<locked>> | 80% | 43,424 psi | 68% | 3314 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 80% | 51,430 psi | 81% | 3389 fps | 99.6% |
| Hodgdon H4895 | <<locked>> | 88% | 46,137 psi | 72% | 3386 fps | 95.5% |
| Hodgdon LEVERevolution | 43.4 gr | 90% | 44,382 psi | 70% | 3392 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,469 psi | 40% | 2005 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 47,268 psi | 74% | 3389 fps | 95.7% |
| IMR 3031 | 35.7 gr | 80% | 34,635 psi | 54% | 3159 fps | 97.5% |
| IMR 4064 | <<locked>> | 94% | 48,994 psi | 77% | 3402 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 44,251 psi | 69% | 3274 fps | 100% |
| IMR 4895 | <<locked>> | 92% | 47,630 psi | 75% | 3445 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 84% | 42,714 psi | 67% | 3271 fps | 95.3% |
| Lovex D073.4 | <<locked>> | 80% | 51,155 psi | 80% | 3461 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 42,438 psi | 67% | 3255 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 82% | 36,593 psi | 57% | 3163 fps | 95.4% |
| Lovex S060 | <<locked>> | 88% | 46,557 psi | 73% | 3307 fps | 95% |
| Lovex S062 | <<locked>> | 90% | 43,207 psi | 68% | 3294 fps | 95.7% |
| Norma 200 | <<locked>> | 80% | 50,154 psi | 79% | 3396 fps | 100% |
| Norma 201 | <<locked>> | 86% | 42,627 psi | 67% | 3268 fps | 95.4% |
| Norma 202 | <<locked>> | 80% | 35,215 psi | 55% | 3104 fps | 95.7% |
| Norma 203B | <<locked>> | 94% | 48,617 psi | 76% | 3451 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 94% | 48,675 psi | 76% | 3458 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 47,456 psi | 74% | 3406 fps | 95.2% |
| Ramshot X-Terminator | <<locked>> | 86% | 49,676 psi | 78% | 3389 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,817 psi | 40% | 2057 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,351 psi | 66% | 3268 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 51,605 psi | 81% | 3589 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 40,625 psi | 64% | 3340 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 39,697 psi | 62% | 3182 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 88% | 43,236 psi | 68% | 3268 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 96% | 45,469 psi | 71% | 3376 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 51,155 psi | 80% | 3461 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 36,593 psi | 57% | 3163 fps | 95.4% |
| Shooters World Precision | <<locked>> | 90% | 43,207 psi | 68% | 3294 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,527 psi | 70% | 3271 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,995 psi | 80% | 3114 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,123 psi | 74% | 3392 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 50,096 psi | 79% | 3497 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,193 psi | 69% | 3307 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 47,224 psi | 74% | 3389 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,028 psi | 58% | 3064 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,356 psi | 48% | 2887 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 40,408 psi | 63% | 3232 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 36,680 psi | 57% | 3071 fps | 97.2% |
| Somchem S341 | <<locked>> | 90% | 49,052 psi | 77% | 3406 fps | 95.5% |
| Somchem S355 | <<locked>> | 96% | 46,659 psi | 73% | 3389 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 50,850 psi | 80% | 3330 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,684 psi | 65% | 3189 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 80% | 36,753 psi | 58% | 3077 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 80% | 32,198 psi | 50% | 3035 fps | 97.7% |
| Vihtavuori N140 | <<locked>> | 80% | 33,199 psi | 52% | 3022 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 92% | 39,349 psi | 62% | 3189 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 84% | 42,685 psi | 67% | 3264 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 82% | 34,360 psi | 54% | 3061 fps | 95.3% |
| Winchester 748 | <<locked>> | 82% | 38,667 psi | 61% | 3235 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 46,441 psi | 73% | 3392 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 82 powders for .25 WSSM loaded with the .257 | 70gr | Impala LWHV LS. Hodgdon LEVERevolution delivers the highest muzzle velocity at 3,661 fps; across all powders the maximum-charge window runs from 2,241 fps to 3,661 fps. Accurate 4064 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.257" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, ADI AR 2208, Alliant Reloder- TS 15.5 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 Power Pro 1200-R, Hodgdon LEVERevolution, IMR 3031 rank at the top here: for .25 WSSM with the .257 | 70gr | Impala LWHV LS 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.