Load Specifications
Load data in caliber .25 WSSM with .257 | 90gr | Hammer Absolute Hammer bullet and 93 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.
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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% | 56,956 psi | 89% | 3169 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,145 psi | 90% | 3281 fps | 98.7% |
| Accurate 2460 | <<locked>> | 86% | 55,521 psi | 87% | 3192 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,725 psi | 90% | 3225 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,566 psi | 90% | 3261 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 57,392 psi | 90% | 3268 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,369 psi | 73% | 3143 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 56,623 psi | 89% | 3117 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,072 psi | 89% | 3143 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,912 psi | 88% | 3258 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 98% | 57,319 psi | 90% | 3255 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 82% | 53,722 psi | 84% | 3189 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,216 psi | 87% | 3212 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 90% | 55,085 psi | 86% | 3202 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,782 psi | 87% | 3376 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,623 psi | 89% | 3278 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,550 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 57,479 psi | 90% | 3301 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,224 psi | 72% | 3153 fps | 96.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 3333 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,970 psi | 88% | 3104 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,072 psi | 88% | 3268 fps | 98.5% |
| Bofors RP3 | <<locked>> | 98% | 57,159 psi | 90% | 3294 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,435 psi | 90% | 3202 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,288 psi | 85% | 3241 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,202 psi | 88% | 3346 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 86% | 56,173 psi | 88% | 3225 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,493 psi | 90% | 3251 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,839 psi | 86% | 3238 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 92% | 56,391 psi | 88% | 3271 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,221 psi | 66% | 3022 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,753 psi | 87% | 3307 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,272 psi | 54% | 1988 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,621 psi | 86% | 3222 fps | 99.3% |
| IMR 3031 | <<locked>> | 92% | 55,666 psi | 87% | 3264 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,623 psi | 89% | 3238 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,537 psi | 90% | 3212 fps | 95.8% |
| IMR 4198 | <<locked>> | 86% | 57,043 psi | 89% | 3143 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,338 psi | 69% | 3081 fps | 96.1% |
| IMR 4895 | <<locked>> | 94% | 55,288 psi | 87% | 3281 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 90% | 55,216 psi | 87% | 3212 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 86% | 55,593 psi | 87% | 3202 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,158 psi | 86% | 3235 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,202 psi | 88% | 3186 fps | 99.2% |
| Lovex S062 | <<locked>> | 96% | 55,927 psi | 88% | 3232 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 3150 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 56,246 psi | 88% | 3150 fps | 100% |
| Norma 201 | <<locked>> | 92% | 54,418 psi | 85% | 3199 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 55,245 psi | 87% | 3215 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,536 psi | 89% | 3287 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 46,456 psi | 73% | 3140 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 96% | 57,334 psi | 90% | 3314 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 56,043 psi | 88% | 3222 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,100 psi | 86% | 3245 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,782 psi | 89% | 3215 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,519 psi | 54% | 2034 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,085 psi | 86% | 3205 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,550 psi | 87% | 3215 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,650 psi | 84% | 3310 fps | 98.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3412 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,499 psi | 73% | 3166 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 55,317 psi | 87% | 3192 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,824 psi | 86% | 3196 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3274 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,692 psi | 81% | 3150 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,158 psi | 86% | 3235 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,927 psi | 88% | 3232 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,984 psi | 86% | 3166 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,449 psi | 88% | 2848 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,389 psi | 85% | 3202 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,042 psi | 86% | 3284 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,041 psi | 85% | 3153 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,969 psi | 85% | 3192 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,549 psi | 85% | 3225 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,000 psi | 89% | 3156 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,869 psi | 89% | 3143 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 56,985 psi | 89% | 3255 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 55,651 psi | 87% | 3143 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,363 psi | 90% | 3248 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3274 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,089 psi | 64% | 3074 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 88% | 56,710 psi | 89% | 3123 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,898 psi | 89% | 3140 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,682 psi | 90% | 3222 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,738 psi | 87% | 3186 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3202 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 3146 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 90% | 56,086 psi | 88% | 3219 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 57,551 psi | 90% | 3235 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3150 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,285 psi | 79% | 3130 fps | 99% |
| Winchester 748 | <<locked>> | 90% | 55,579 psi | 87% | 3268 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,230 psi | 85% | 3232 fps | 99.4% |
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% | 41,205 psi | 65% | 2907 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,113 psi | 83% | 3209 fps | 98.1% |
| Accurate 2460 | <<locked>> | 80% | 44,933 psi | 70% | 3012 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 33,344 psi | 52% | 2779 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 40,306 psi | 63% | 2953 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 31,531 psi | 49% | 2753 fps | 97.7% |
| Accurate 4350 | <<locked>> | 98% | 43,134 psi | 68% | 3077 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 49,835 psi | 78% | 3009 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,212 psi | 79% | 3031 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 38,000 psi | 60% | 2894 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 86% | 39,262 psi | 62% | 2904 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 50,270 psi | 79% | 3133 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,059 psi | 63% | 2917 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 38,972 psi | 61% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | 41.7 gr | 86% | 42,380 psi | 66% | 3097 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,781 psi | 56% | 2858 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,717 psi | 73% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 38,682 psi | 61% | 2930 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 43,337 psi | 68% | 3091 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 37,985 psi | 60% | 2992 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,255 psi | 77% | 3002 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,554 psi | 67% | 3012 fps | 95.6% |
| Bofors RP3 | <<locked>> | 84% | 34,969 psi | 55% | 2848 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,003 psi | 66% | 2920 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,276 psi | 60% | 2927 fps | 97.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,192 psi | 66% | 3074 fps | 96.1% |
| Hodgdon H322 | <<locked>> | 80% | 45,992 psi | 72% | 3054 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,717 psi | 73% | 3071 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 44,614 psi | 70% | 3045 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 38,261 psi | 60% | 2910 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,956 psi | 58% | 2900 fps | 95.5% |
| Hodgdon LEVERevolution | 38 gr | 80% | 34,200 psi | 54% | 2851 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,512 psi | 40% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,985 psi | 58% | 2858 fps | 95.6% |
| IMR 3031 | <<locked>> | 80% | 37,217 psi | 58% | 2923 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 38,580 psi | 60% | 2884 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,070 psi | 85% | 3153 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 47,456 psi | 74% | 2995 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 41,423 psi | 65% | 3018 fps | 95.2% |
| IMR 4895 | <<locked>> | 82% | 37,043 psi | 58% | 2904 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,059 psi | 63% | 2917 fps | 97.4% |
| Lovex D073.5 | <<locked>> | 80% | 44,686 psi | 70% | 3012 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 36,245 psi | 57% | 2867 fps | 98% |
| Lovex S060 | <<locked>> | 80% | 38,740 psi | 61% | 2841 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 33,373 psi | 52% | 2762 fps | 95.3% |
| Lovex S065 | <<locked>> | 98% | 48,443 psi | 76% | 3091 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 52,707 psi | 83% | 3097 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,028 psi | 58% | 2848 fps | 96.6% |
| Norma 202 | <<locked>> | 80% | 37,217 psi | 58% | 2867 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 37,956 psi | 59% | 2917 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 43,424 psi | 68% | 3077 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 84% | 37,724 psi | 59% | 2927 fps | 95% |
| Ramshot TAC | <<locked>> | 86% | 49,211 psi | 77% | 3097 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,204 psi | 61% | 2927 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,439 psi | 68% | 2969 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,556 psi | 40% | 1821 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,063 psi | 71% | 3025 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 52,127 psi | 82% | 3156 fps | 95.4% |
| ReloadSwiss RS 52 | 39.5 gr | 84% | 40,437 psi | 63% | 3041 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,922 psi | 48% | 2795 fps | 95.2% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 43,163 psi | 68% | 3097 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 40,683 psi | 64% | 2917 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 35,201 psi | 55% | 2792 fps | 96% |
| Rottweil R 903 | <<locked>> | 86% | 35,157 psi | 55% | 2844 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,443 psi | 76% | 3091 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,245 psi | 57% | 2867 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 33,373 psi | 52% | 2762 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,906 psi | 75% | 3045 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,708 psi | 84% | 2812 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,662 psi | 79% | 3140 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 39,247 psi | 62% | 2969 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,601 psi | 75% | 3048 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 47,007 psi | 74% | 3061 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 39,117 psi | 61% | 2917 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,769 psi | 61% | 2825 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,763 psi | 50% | 2664 fps | 98.3% |
| Somchem S321 | <<locked>> | 80% | 43,221 psi | 68% | 3005 fps | 98.4% |
| Somchem S335 | <<locked>> | 80% | 38,290 psi | 60% | 2828 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 37,811 psi | 59% | 2871 fps | 95.2% |
| Somchem S355 | <<locked>> | 86% | 36,347 psi | 57% | 2861 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 33,663 psi | 53% | 2881 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 44,092 psi | 69% | 2920 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,943 psi | 61% | 2835 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,069 psi | 53% | 2795 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 35,201 psi | 55% | 2795 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 84% | 32,329 psi | 51% | 2733 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 96% | 42,946 psi | 67% | 3025 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 39,972 psi | 63% | 2913 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 33,881 psi | 53% | 2776 fps | 97.8% |
| Vihtavuori N550 | <<locked>> | 98% | 44,744 psi | 70% | 3077 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,955 psi | 56% | 2822 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 39,030 psi | 61% | 2953 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,839 psi | 56% | 2854 fps | 95.4% |
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 93 powders for .25 WSSM loaded with the .257 | 90gr | Hammer Absolute Hammer. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,412 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,412 fps. Accurate 4350 gives the best case fill at 100 %, and 93 of the 93 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 90.0 gr projectile in 0.257" calls for a 1:10.0 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 LEVERevolution rank at the top here: for .25 WSSM with the .257 | 90gr | Hammer Absolute Hammer 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.