Load Specifications
Load data in caliber .25 WSSM with .257 | 90gr | Winchester Soft-Point bullet and 92 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 ReloadSwiss RS 60.
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>> | 88% | 55,027 psi | 86% | 3140 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 57,261 psi | 90% | 3215 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,536 psi | 89% | 3205 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,276 psi | 90% | 3261 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 56,217 psi | 88% | 3245 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 3179 fps | 97% |
| Accurate LT-30 | <<locked>> | 82% | 54,302 psi | 85% | 3077 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,694 psi | 86% | 3107 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 57,725 psi | 90% | 3284 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 96% | 55,405 psi | 87% | 3222 fps | 98.7% |
| ADI AR 2219 | <<locked>> | 82% | 55,564 psi | 87% | 3215 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,956 psi | 89% | 3238 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 90% | 57,130 psi | 90% | 3225 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 54,708 psi | 86% | 3294 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 57,435 psi | 90% | 3402 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,563 psi | 86% | 3241 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,955 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,332 psi | 87% | 3264 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,747 psi | 75% | 3186 fps | 97% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3360 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,450 psi | 90% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,954 psi | 85% | 3232 fps | 98.2% |
| Bofors RP3 | <<locked>> | 96% | 55,114 psi | 86% | 3258 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,637 psi | 87% | 3173 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,173 psi | 88% | 3268 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,012 psi | 85% | 3304 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 86% | 57,595 psi | 90% | 3245 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,303 psi | 87% | 3215 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,739 psi | 89% | 3268 fps | 98% |
| Hodgdon H4895 | <<locked>> | 90% | 54,752 psi | 86% | 3241 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,888 psi | 69% | 3054 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,595 psi | 90% | 3333 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 55% | 1998 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,275 psi | 88% | 3245 fps | 99.5% |
| IMR 3031 | <<locked>> | 92% | 57,682 psi | 90% | 3287 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,824 psi | 86% | 3205 fps | 98.8% |
| IMR 4198 | <<locked>> | 84% | 55,114 psi | 86% | 3114 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,195 psi | 72% | 3117 fps | 96.6% |
| IMR 4895 | <<locked>> | 94% | 56,797 psi | 89% | 3301 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 90% | 56,956 psi | 89% | 3238 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 57,276 psi | 90% | 3225 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 57,276 psi | 90% | 3261 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,389 psi | 85% | 3153 fps | 99% |
| Lovex S062 | <<locked>> | 94% | 54,389 psi | 85% | 3205 fps | 99.7% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,490 psi | 84% | 3179 fps | 96.6% |
| Norma 201 | <<locked>> | 92% | 56,434 psi | 88% | 3228 fps | 99.8% |
| Norma 202 | <<locked>> | 92% | 56,724 psi | 89% | 3235 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,491 psi | 85% | 3251 fps | 99.1% |
| Norma URPᴾ | <<locked>> | 100% | 48,196 psi | 76% | 3173 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 94% | 55,085 psi | 86% | 3274 fps | 99% |
| Ramshot TAC | <<locked>> | 90% | 57,682 psi | 90% | 3245 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,840 psi | 89% | 3271 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,665 psi | 86% | 3179 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,128 psi | 55% | 2044 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 56,492 psi | 89% | 3222 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,276 psi | 90% | 3241 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,593 psi | 87% | 3340 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,535 psi | 87% | 3376 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,327 psi | 76% | 3199 fps | 96.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 3219 fps | 96% |
| Rottweil R 901 | <<locked>> | 90% | 57,174 psi | 90% | 3215 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,840 psi | 89% | 3222 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 98% | 54,984 psi | 86% | 3245 fps | 99.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,490 psi | 84% | 3179 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 92% | 57,276 psi | 90% | 3261 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,389 psi | 85% | 3205 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,753 psi | 89% | 3192 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,696 psi | 90% | 2861 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,796 psi | 87% | 3222 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,811 psi | 89% | 3310 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,927 psi | 88% | 3179 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,840 psi | 88% | 3219 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,275 psi | 88% | 3248 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,158 psi | 86% | 3123 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,911 psi | 86% | 3114 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 54,940 psi | 86% | 3222 fps | 99.8% |
| Somchem S335 | <<locked>> | 92% | 57,479 psi | 90% | 3166 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,129 psi | 86% | 3209 fps | 99% |
| Somchem S355 | <<locked>> | 98% | 55,492 psi | 87% | 3245 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,801 psi | 67% | 3110 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 86% | 54,650 psi | 86% | 3091 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,114 psi | 86% | 3110 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,941 psi | 88% | 3192 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,551 psi | 90% | 3212 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3228 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,836 psi | 80% | 3176 fps | 97.3% |
| Vihtavuori N530 | <<locked>> | 90% | 57,479 psi | 90% | 3235 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 55,811 psi | 87% | 3205 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,966 psi | 78% | 3179 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,185 psi | 82% | 3163 fps | 99.2% |
| Winchester 748 | <<locked>> | 90% | 56,985 psi | 89% | 3287 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,985 psi | 88% | 3258 fps | 99.5% |
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% | 42,844 psi | 67% | 2930 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,717 psi | 73% | 3041 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 35,447 psi | 56% | 2822 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 40,480 psi | 63% | 2959 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 33,489 psi | 52% | 2795 fps | 98.3% |
| Accurate 4350 | <<locked>> | 96% | 42,192 psi | 66% | 3054 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 51,372 psi | 81% | 3035 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,750 psi | 81% | 3058 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,421 psi | 62% | 2923 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 86% | 40,524 psi | 64% | 2927 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 51,721 psi | 81% | 3153 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,423 psi | 65% | 2946 fps | 97.8% |
| Alliant AR-Comp | <<locked>> | 80% | 40,611 psi | 64% | 2959 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,979 psi | 75% | 3173 fps | 98.5% |
| Alliant Power Pro 2000-MR | 41.1 gr | 84% | 40,944 psi | 64% | 3058 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,896 psi | 55% | 2831 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,283 psi | 76% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 40,118 psi | 63% | 2959 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 96% | 42,148 psi | 66% | 3058 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 37,159 psi | 58% | 2963 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,430 psi | 79% | 3018 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 41,205 psi | 65% | 2979 fps | 95.2% |
| Bofors RP3 | <<locked>> | 82% | 34,258 psi | 54% | 2825 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,598 psi | 68% | 2949 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,769 psi | 62% | 2956 fps | 98% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,598 psi | 68% | 3100 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 80% | 47,427 psi | 74% | 3077 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,109 psi | 75% | 3094 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 43,569 psi | 68% | 3022 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,682 psi | 62% | 2936 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,172 psi | 57% | 2877 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,549 psi | 56% | 2884 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,817 psi | 40% | 1788 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,261 psi | 60% | 2887 fps | 96.1% |
| IMR 3031 | <<locked>> | 80% | 38,827 psi | 61% | 2953 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 39,943 psi | 63% | 2910 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,776 psi | 76% | 3015 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 43,236 psi | 68% | 3054 fps | 95.8% |
| IMR 4895 | <<locked>> | 82% | 38,522 psi | 60% | 2936 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 41,423 psi | 65% | 2946 fps | 97.8% |
| Lovex D073.5 | <<locked>> | 80% | 46,702 psi | 73% | 3045 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 37,898 psi | 59% | 2900 fps | 98.4% |
| Lovex S060 | <<locked>> | 80% | 39,987 psi | 63% | 2867 fps | 96.2% |
| Lovex S062 | <<locked>> | 80% | 34,896 psi | 55% | 2799 fps | 96% |
| Lovex S065 | <<locked>> | 96% | 47,210 psi | 74% | 3061 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,653 psi | 61% | 2881 fps | 97.2% |
| Norma 202 | <<locked>> | 80% | 38,711 psi | 61% | 2897 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 36,985 psi | 58% | 2884 fps | 95.1% |
| Norma URP | <<locked>> | 96% | 42,351 psi | 66% | 3051 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 84% | 39,334 psi | 62% | 2959 fps | 95.7% |
| Ramshot TAC | <<locked>> | 84% | 47,514 psi | 74% | 3061 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,553 psi | 64% | 2956 fps | 96.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,020 psi | 71% | 2995 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,933 psi | 41% | 1827 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,470 psi | 73% | 3048 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 50,241 psi | 79% | 3120 fps | 95% |
| ReloadSwiss RS 52 | 38.9 gr | 82% | 39,204 psi | 61% | 3009 fps | 95.1% |
| ReloadSwiss RS 60 | 39.5 gr | 82% | 32,401 psi | 51% | 2841 fps | 96.1% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 44,933 psi | 70% | 3130 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 45,934 psi | 72% | 3146 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 42,496 psi | 67% | 2949 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 36,796 psi | 58% | 2825 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 84% | 34,403 psi | 54% | 2822 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 47,210 psi | 74% | 3061 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,898 psi | 59% | 2900 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 34,896 psi | 55% | 2799 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,269 psi | 77% | 3064 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,607 psi | 86% | 2822 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,098 psi | 82% | 3159 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 38,363 psi | 60% | 2943 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,081 psi | 77% | 3068 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 45,527 psi | 71% | 3028 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,014 psi | 60% | 2884 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,176 psi | 63% | 2851 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,083 psi | 52% | 2694 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 44,643 psi | 70% | 3031 fps | 98.7% |
| Somchem S335 | <<locked>> | 80% | 39,755 psi | 62% | 2854 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 39,175 psi | 61% | 2900 fps | 95.7% |
| Somchem S355 | <<locked>> | 84% | 35,549 psi | 56% | 2835 fps | 95.2% |
| Somchem S365 | <<locked>> | 92% | 33,112 psi | 52% | 2858 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 45,527 psi | 71% | 2943 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,335 psi | 63% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,650 psi | 56% | 2825 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 36,579 psi | 57% | 2825 fps | 99% |
| Vihtavuori N150 | <<locked>> | 82% | 31,647 psi | 50% | 2707 fps | 95.3% |
| Vihtavuori N160 | <<locked>> | 96% | 44,614 psi | 70% | 3054 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 41,379 psi | 65% | 2940 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 80% | 35,273 psi | 55% | 2805 fps | 98.3% |
| Vihtavuori N550 | <<locked>> | 96% | 43,656 psi | 68% | 3054 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 37,057 psi | 58% | 2848 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 40,422 psi | 63% | 2979 fps | 98.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,202 psi | 58% | 2884 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 92 powders for .25 WSSM loaded with the .257 | 90gr | Winchester Soft-Point. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,402 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,402 fps. Accurate 4350 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.257" calls for a 1:11.0 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, ReloadSwiss RS 60 rank at the top here: for .25 WSSM with the .257 | 90gr | Winchester 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.