Load Specifications
Load data in caliber .25 WSSM with .257 | 80gr | Impala LWHV LS bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and Hodgdon CFE223.
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>> | 90% | 56,144 psi | 88% | 3297 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,434 psi | 87% | 3379 fps | 97.2% |
| Accurate 2230 | <<locked>> | 82% | 57,145 psi | 90% | 3396 fps | 97.8% |
| Accurate 2460 | <<locked>> | 86% | 55,114 psi | 86% | 3314 fps | 99.9% |
| Accurate 2495 | <<locked>> | 94% | 54,404 psi | 85% | 3314 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 56,101 psi | 88% | 3373 fps | 99.9% |
| Accurate 4064 | <<locked>> | 98% | 57,392 psi | 90% | 3406 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 55,405 psi | 87% | 3235 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,782 psi | 87% | 3255 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 92% | 54,694 psi | 86% | 3366 fps | 98% |
| ADI AR 2207 | <<locked>> | 82% | 57,203 psi | 90% | 3274 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 55,419 psi | 87% | 3346 fps | 97.4% |
| ADI AR 2219 | <<locked>> | 84% | 56,014 psi | 88% | 3366 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 57,246 psi | 90% | 3376 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 92% | 56,826 psi | 89% | 3379 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,521 psi | 87% | 3448 fps | 98.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 57,638 psi | 90% | 3530 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,882 psi | 86% | 3379 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,825 psi | 87% | 3314 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,738 psi | 87% | 3399 fps | 97.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,112 psi | 82% | 3419 fps | 98% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,621 psi | 86% | 3219 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,491 psi | 85% | 3366 fps | 96.9% |
| Bofors RP3 | <<locked>> | 98% | 55,709 psi | 87% | 3399 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,202 psi | 88% | 3314 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,550 psi | 89% | 3412 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,244 psi | 85% | 3442 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,462 psi | 85% | 3340 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,956 psi | 88% | 3366 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 57,348 psi | 90% | 3402 fps | 96.6% |
| Hodgdon H4198 | <<locked>> | 82% | 57,029 psi | 89% | 3291 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 55,201 psi | 87% | 3379 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 57,014 psi | 89% | 3461 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,650 psi | 54% | 2087 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,550 psi | 89% | 3383 fps | 98.6% |
| IMR 3031 | <<locked>> | 94% | 57,464 psi | 90% | 3442 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,201 psi | 87% | 3337 fps | 97.6% |
| IMR 4198 | <<locked>> | 86% | 55,477 psi | 87% | 3268 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 57,116 psi | 90% | 3442 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 92% | 57,246 psi | 90% | 3376 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 86% | 55,114 psi | 86% | 3320 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 94% | 57,740 psi | 90% | 3409 fps | 99.9% |
| Lovex S060 | <<locked>> | 92% | 54,940 psi | 86% | 3287 fps | 98% |
| Lovex S062 | <<locked>> | 96% | 55,042 psi | 86% | 3346 fps | 99% |
| Norma 200 | <<locked>> | 82% | 56,420 psi | 88% | 3291 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,406 psi | 90% | 3373 fps | 99.2% |
| Norma 202 | <<locked>> | 94% | 57,174 psi | 90% | 3383 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,882 psi | 86% | 3389 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 96% | 55,143 psi | 86% | 3406 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 57,508 psi | 90% | 3412 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,695 psi | 87% | 3320 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,012 psi | 55% | 2136 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 57,246 psi | 90% | 3373 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,216 psi | 87% | 3468 fps | 97.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 3507 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 90% | 55,463 psi | 87% | 3320 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 96% | 57,740 psi | 90% | 3366 fps | 99.2% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 3379 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 94% | 57,740 psi | 90% | 3409 fps | 99.9% |
| Shooters World Precision | <<locked>> | 96% | 55,042 psi | 86% | 3346 fps | 99% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 57,653 psi | 90% | 3337 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,811 psi | 87% | 2979 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,536 psi | 89% | 3373 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3445 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,289 psi | 88% | 3330 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,637 psi | 89% | 3350 fps | 96.3% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,666 psi | 89% | 3386 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,811 psi | 87% | 3268 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,056 psi | 86% | 3255 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,506 psi | 87% | 3363 fps | 99.2% |
| Somchem S335 | <<locked>> | 92% | 54,940 psi | 86% | 3264 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,869 psi | 88% | 3350 fps | 98% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,651 psi | 87% | 3379 fps | 98.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,843 psi | 64% | 3169 fps | 96.6% |
| Vihtavuori N120 | <<locked>> | 82% | 56,971 psi | 89% | 3212 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 55,564 psi | 87% | 3248 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,390 psi | 87% | 3258 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,231 psi | 88% | 3343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,418 psi | 85% | 3304 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,867 psi | 84% | 3304 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 90% | 54,810 psi | 86% | 3323 fps | 99% |
| Vihtavuori N540 | <<locked>> | 96% | 56,391 psi | 88% | 3350 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,240 psi | 77% | 3219 fps | 97.4% |
| Winchester 748 | <<locked>> | 92% | 57,392 psi | 90% | 3435 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,304 psi | 88% | 3396 fps | 98.7% |
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% | 41,698 psi | 65% | 3035 fps | 99.9% |
| Accurate 2200 | <<locked>> | 80% | 52,069 psi | 82% | 3314 fps | 96.5% |
| Accurate 2230 | <<locked>> | 80% | 53,258 psi | 83% | 3327 fps | 97.2% |
| Accurate 2460 | <<locked>> | 80% | 45,513 psi | 71% | 3136 fps | 99% |
| Accurate 2495 | <<locked>> | 80% | 35,433 psi | 56% | 2936 fps | 99.4% |
| Accurate 2520 | <<locked>> | 80% | 40,466 psi | 63% | 3068 fps | 97.8% |
| Accurate 4064 | <<locked>> | 80% | 33,373 psi | 52% | 2900 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 80% | 49,327 psi | 77% | 3130 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,617 psi | 78% | 3146 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 84% | 43,207 psi | 68% | 3127 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 54,070 psi | 85% | 3225 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 46,369 psi | 73% | 3173 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 49,342 psi | 77% | 3251 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,045 psi | 63% | 3028 fps | 95.9% |
| Alliant AR-Comp | <<locked>> | 80% | 38,595 psi | 60% | 3058 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,788 psi | 72% | 3255 fps | 96.7% |
| Alliant Power Pro 2000-MR | 42.8 gr | 90% | 47,587 psi | 75% | 3320 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 40,553 psi | 64% | 3087 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,891 psi | 73% | 3159 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 46,383 psi | 73% | 3219 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 43,047 psi | 67% | 3219 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,341 psi | 76% | 3110 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 47,601 psi | 75% | 3235 fps | 95.3% |
| Bofors RP3 | <<locked>> | 86% | 38,058 psi | 60% | 3035 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,945 psi | 66% | 3028 fps | 97.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,334 psi | 60% | 3038 fps | 96.1% |
| Hodgdon CFE223 | 40.9 gr | 84% | 47,558 psi | 75% | 3307 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 80% | 44,962 psi | 70% | 3163 fps | 99.6% |
| Hodgdon H335 | <<locked>> | 80% | 45,876 psi | 72% | 3179 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 94% | 50,285 psi | 79% | 3274 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 53,969 psi | 85% | 3238 fps | 100% |
| Hodgdon H4895 | <<locked>> | 82% | 40,930 psi | 64% | 3084 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 38,943 psi | 61% | 3081 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,860 psi | 41% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 41,829 psi | 66% | 3087 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 37,101 psi | 58% | 3041 fps | 99.1% |
| IMR 4064 | <<locked>> | 90% | 46,151 psi | 72% | 3163 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 46,717 psi | 73% | 3120 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 42,264 psi | 66% | 3140 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,045 psi | 63% | 3028 fps | 95.9% |
| Lovex D073.5 | <<locked>> | 80% | 45,252 psi | 71% | 3133 fps | 98.1% |
| Lovex D073.6 | <<locked>> | 80% | 36,912 psi | 58% | 2992 fps | 96.8% |
| Lovex S060 | <<locked>> | 84% | 43,830 psi | 69% | 3068 fps | 95.6% |
| Lovex S062 | <<locked>> | 84% | 38,667 psi | 61% | 3005 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 53,098 psi | 83% | 3238 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,985 psi | 60% | 2969 fps | 95.3% |
| Norma 202 | <<locked>> | 80% | 37,579 psi | 59% | 2989 fps | 97.7% |
| Norma 203B | <<locked>> | 88% | 43,236 psi | 68% | 3153 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 90% | 45,643 psi | 72% | 3219 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 44,222 psi | 69% | 3156 fps | 95.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,395 psi | 68% | 3074 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 41% | 1923 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,773 psi | 70% | 3140 fps | 98.4% |
| ReloadSwiss RS 52 | 40.5 gr | 88% | 45,237 psi | 71% | 3271 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,549 psi | 56% | 3031 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 41,945 psi | 66% | 3051 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 38,508 psi | 60% | 2976 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 90% | 40,393 psi | 63% | 3081 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,912 psi | 58% | 2992 fps | 96.8% |
| Shooters World Precision | <<locked>> | 84% | 38,667 psi | 61% | 3005 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,181 psi | 74% | 3146 fps | 97.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,185 psi | 83% | 2940 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,719 psi | 78% | 3251 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 44,251 psi | 69% | 3196 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,746 psi | 73% | 3163 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,185 psi | 83% | 3291 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 44,150 psi | 69% | 3143 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,073 psi | 61% | 2940 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,213 psi | 50% | 2779 fps | 97.2% |
| Somchem S321 | <<locked>> | 80% | 42,975 psi | 67% | 3114 fps | 97% |
| Somchem S335 | <<locked>> | 80% | 38,899 psi | 61% | 2949 fps | 98.7% |
| Somchem S341 | <<locked>> | 84% | 42,830 psi | 67% | 3097 fps | 95.1% |
| Somchem S355 | <<locked>> | 90% | 41,510 psi | 65% | 3094 fps | 95.5% |
| Somchem S365 | <<locked>> | 98% | 38,421 psi | 60% | 3107 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 53,867 psi | 84% | 3166 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,932 psi | 69% | 3041 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,885 psi | 61% | 2946 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 80% | 34,548 psi | 54% | 2917 fps | 99.2% |
| Vihtavuori N140 | <<locked>> | 80% | 35,491 psi | 56% | 2910 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 88% | 37,057 psi | 58% | 2959 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 40,030 psi | 63% | 3025 fps | 96% |
| Vihtavuori N540 | <<locked>> | 80% | 34,461 psi | 54% | 2894 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 43,439 psi | 68% | 3094 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 38,827 psi | 61% | 3061 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 40,756 psi | 64% | 3084 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 .25 WSSM loaded with the .257 | 80gr | Impala LWHV LS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,530 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,530 fps. Accurate 4350 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 54–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.257" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 2000-MR, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .25 WSSM with the .257 | 80gr | Impala LWHV LS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 4350, Alliant Reloder-16 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.