Load Specifications
Load data in caliber .25 WSSM with .257 | 87gr | Winchester Pointed Soft Point bullet and 91 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 LEVERevolution.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 57,246 psi | 90% | 3222 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,217 psi | 90% | 3327 fps | 98.5% |
| Accurate 2460 | <<locked>> | 86% | 55,825 psi | 87% | 3238 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,911 psi | 86% | 3232 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,624 psi | 90% | 3304 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 54,607 psi | 86% | 3271 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,876 psi | 73% | 3192 fps | 96.3% |
| Accurate LT-30 | <<locked>> | 84% | 56,652 psi | 89% | 3163 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,101 psi | 89% | 3189 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,333 psi | 88% | 3307 fps | 99% |
| ADI AR 2208 | <<locked>> | 98% | 57,580 psi | 90% | 3301 fps | 98.7% |
| ADI AR 2219 | <<locked>> | 82% | 54,215 psi | 85% | 3241 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,637 psi | 87% | 3261 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 90% | 55,521 psi | 87% | 3255 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 57,246 psi | 90% | 3389 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,927 psi | 88% | 3419 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,608 psi | 89% | 3320 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,840 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,911 psi | 84% | 3284 fps | 98.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 3199 fps | 96.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 3379 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,246 psi | 88% | 3153 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,289 psi | 88% | 3314 fps | 98.3% |
| Bofors RP3 | <<locked>> | 98% | 57,595 psi | 90% | 3343 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,447 psi | 85% | 3199 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,694 psi | 86% | 3291 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,376 psi | 88% | 3392 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 86% | 56,202 psi | 88% | 3274 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,954 psi | 85% | 3241 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,245 psi | 87% | 3287 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 92% | 56,811 psi | 89% | 3323 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,656 psi | 67% | 3068 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,985 psi | 88% | 3353 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,635 psi | 54% | 2028 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,940 psi | 86% | 3271 fps | 99.2% |
| IMR 3031 | <<locked>> | 92% | 56,086 psi | 88% | 3317 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 57,000 psi | 89% | 3287 fps | 98.8% |
| IMR 4198 | <<locked>> | 86% | 57,145 psi | 90% | 3192 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 55,317 psi | 87% | 3323 fps | 99% |
| IMR 8208 XBR | <<locked>> | 90% | 55,637 psi | 87% | 3261 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 86% | 55,825 psi | 87% | 3248 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 55,695 psi | 87% | 3287 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,579 psi | 89% | 3235 fps | 99.1% |
| Lovex S062 | <<locked>> | 96% | 56,449 psi | 88% | 3284 fps | 99.7% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3199 fps | 95.9% |
| Norma 200 | <<locked>> | 82% | 56,797 psi | 89% | 3205 fps | 100% |
| Norma 201 | <<locked>> | 92% | 55,071 psi | 86% | 3251 fps | 99.6% |
| Norma 202 | <<locked>> | 92% | 55,317 psi | 87% | 3261 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,942 psi | 89% | 3337 fps | 99.2% |
| Norma URPᴾ | <<locked>> | 100% | 46,804 psi | 73% | 3186 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 96% | 57,435 psi | 90% | 3356 fps | 99.1% |
| Ramshot TAC | <<locked>> | 90% | 56,347 psi | 88% | 3264 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,419 psi | 87% | 3291 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 57,159 psi | 90% | 3264 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,940 psi | 55% | 2073 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,187 psi | 86% | 3251 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,854 psi | 88% | 3261 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,696 psi | 90% | 3419 fps | 98.9% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3458 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 55,854 psi | 88% | 3241 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,477 psi | 87% | 3248 fps | 99.6% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3327 fps | 99.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3199 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,695 psi | 87% | 3287 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,449 psi | 88% | 3284 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,448 psi | 87% | 3219 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,782 psi | 89% | 2897 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,476 psi | 85% | 3245 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,245 psi | 87% | 3330 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,636 psi | 86% | 3209 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,418 psi | 85% | 3238 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,897 psi | 86% | 3274 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,130 psi | 90% | 3199 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,797 psi | 89% | 3189 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 57,406 psi | 90% | 3307 fps | 99.8% |
| Somchem S335 | <<locked>> | 92% | 56,173 psi | 88% | 3196 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,566 psi | 90% | 3294 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3323 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,524 psi | 65% | 3120 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 88% | 56,913 psi | 89% | 3173 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,985 psi | 89% | 3186 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,447 psi | 85% | 3222 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,130 psi | 88% | 3238 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3251 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3192 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 90% | 56,101 psi | 88% | 3261 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 94% | 54,418 psi | 85% | 3232 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,515 psi | 76% | 3196 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,865 psi | 80% | 3179 fps | 98.8% |
| Winchester 748 | <<locked>> | 90% | 55,463 psi | 87% | 3310 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,520 psi | 85% | 3281 fps | 99.2% |
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% | 41,785 psi | 65% | 2956 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,621 psi | 84% | 3261 fps | 97.9% |
| Accurate 2460 | <<locked>> | 80% | 45,513 psi | 71% | 3061 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 34,374 psi | 54% | 2841 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 40,770 psi | 64% | 2999 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 32,474 psi | 51% | 2812 fps | 97.7% |
| Accurate 4350 | <<locked>> | 98% | 43,714 psi | 69% | 3127 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 50,357 psi | 79% | 3061 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,720 psi | 79% | 3084 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 38,435 psi | 60% | 2940 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 88% | 42,119 psi | 66% | 3005 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 50,444 psi | 79% | 3179 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,437 psi | 63% | 2966 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 80% | 39,392 psi | 62% | 2982 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,702 psi | 73% | 3192 fps | 98% |
| Alliant Power Pro 2000-MR | 42 gr | 86% | 42,511 psi | 67% | 3136 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,216 psi | 57% | 2904 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,152 psi | 74% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,916 psi | 66% | 3045 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 43,758 psi | 69% | 3136 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 38,464 psi | 60% | 3038 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,385 psi | 77% | 3045 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 43,018 psi | 67% | 3061 fps | 95.3% |
| Bofors RP3 | <<locked>> | 84% | 35,781 psi | 56% | 2907 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,641 psi | 67% | 2972 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,682 psi | 61% | 2972 fps | 97.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,395 psi | 66% | 3117 fps | 95.8% |
| Hodgdon H322 | <<locked>> | 80% | 46,253 psi | 72% | 3104 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,920 psi | 74% | 3117 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 45,208 psi | 71% | 3097 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,682 psi | 61% | 2956 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 37,463 psi | 59% | 2946 fps | 95.2% |
| Hodgdon LEVERevolution | 39.3 gr | 82% | 37,130 psi | 58% | 2966 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,686 psi | 40% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,318 psi | 58% | 2904 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 37,681 psi | 59% | 2972 fps | 99.7% |
| IMR 4064 | <<locked>> | 86% | 41,481 psi | 65% | 2986 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 47,732 psi | 75% | 3045 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 39,958 psi | 63% | 3015 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 80% | 40,437 psi | 63% | 2966 fps | 97.2% |
| Lovex D073.5 | <<locked>> | 80% | 45,484 psi | 71% | 3068 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 36,796 psi | 58% | 2917 fps | 97.9% |
| Lovex S060 | <<locked>> | 80% | 39,117 psi | 61% | 2887 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 33,968 psi | 53% | 2815 fps | 95.2% |
| Lovex S065 | <<locked>> | 98% | 48,979 psi | 77% | 3140 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 53,330 psi | 84% | 3150 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,695 psi | 59% | 2897 fps | 96.5% |
| Norma 202 | <<locked>> | 80% | 37,695 psi | 59% | 2917 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 38,377 psi | 60% | 2963 fps | 95.2% |
| Norma URP | <<locked>> | 98% | 43,845 psi | 69% | 3123 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 40,756 psi | 64% | 3035 fps | 95.7% |
| Ramshot TAC | <<locked>> | 86% | 49,632 psi | 78% | 3143 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,494 psi | 62% | 2972 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,990 psi | 69% | 3018 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 40% | 1854 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,368 psi | 71% | 3071 fps | 99.2% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 52,533 psi | 82% | 3202 fps | 95.1% |
| ReloadSwiss RS 52 | 39.8 gr | 84% | 40,654 psi | 64% | 3087 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 31,560 psi | 49% | 2851 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 41,481 psi | 65% | 2972 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 80% | 35,868 psi | 56% | 2844 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 86% | 35,665 psi | 56% | 2894 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,979 psi | 77% | 3140 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,796 psi | 58% | 2917 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 33,968 psi | 53% | 2815 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,124 psi | 75% | 3087 fps | 98.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,722 psi | 84% | 2854 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,850 psi | 80% | 3186 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 39,755 psi | 62% | 3018 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,921 psi | 75% | 3097 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 47,239 psi | 74% | 3107 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 39,711 psi | 62% | 2966 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,262 psi | 62% | 2874 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,242 psi | 51% | 2710 fps | 98.2% |
| Somchem S321 | <<locked>> | 80% | 43,511 psi | 68% | 3051 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 38,812 psi | 61% | 2874 fps | 99.4% |
| Somchem S341 | <<locked>> | 82% | 40,915 psi | 64% | 2979 fps | 95.9% |
| Somchem S355 | <<locked>> | 86% | 36,854 psi | 58% | 2910 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 34,287 psi | 54% | 2930 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 44,512 psi | 70% | 2969 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,363 psi | 62% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,621 psi | 54% | 2844 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 80% | 35,607 psi | 56% | 2844 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 84% | 32,808 psi | 51% | 2779 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 96% | 43,366 psi | 68% | 3071 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 40,350 psi | 63% | 2956 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,345 psi | 54% | 2822 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 98% | 45,165 psi | 71% | 3127 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 38,682 psi | 61% | 2923 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 39,291 psi | 62% | 2995 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,187 psi | 57% | 2897 fps | 95.1% |
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 91 powders for .25 WSSM loaded with the .257 | 87gr | Winchester Pointed Soft Point. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,458 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,458 fps. Accurate 4350 gives the best case fill at 100 %, and 91 of the 91 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 87.0 gr projectile in 0.257" calls for a 1:10.5 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 LEVERevolution rank at the top here: for .25 WSSM with the .257 | 87gr | Winchester Pointed Soft Point 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.