Load Specifications
Load data in caliber .25 WSSM with .257 | 75gr | Barnes X bullet and 86 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% | 55,927 psi | 88% | 3399 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,361 psi | 87% | 3484 fps | 96.8% |
| Accurate 2230 | <<locked>> | 82% | 57,072 psi | 89% | 3501 fps | 97.5% |
| Accurate 2460 | <<locked>> | 86% | 54,926 psi | 86% | 3415 fps | 99.8% |
| Accurate 2495 | <<locked>> | 94% | 54,491 psi | 85% | 3422 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,143 psi | 85% | 3455 fps | 99.6% |
| Accurate 2520 | <<locked>> | 90% | 54,143 psi | 85% | 3455 fps | 99.6% |
| Accurate 4064 | <<locked>> | 98% | 57,188 psi | 90% | 3504 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 55,172 psi | 86% | 3340 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,448 psi | 87% | 3356 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 92% | 54,795 psi | 86% | 3468 fps | 97.7% |
| ADI AR 2207 | <<locked>> | 82% | 56,826 psi | 89% | 3379 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 55,347 psi | 87% | 3448 fps | 97.1% |
| ADI AR 2219 | <<locked>> | 84% | 55,651 psi | 87% | 3468 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 57,348 psi | 90% | 3484 fps | 99% |
| Alliant AR-Comp | <<locked>> | 92% | 56,768 psi | 89% | 3488 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,216 psi | 87% | 3550 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 57,508 psi | 90% | 3629 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,665 psi | 86% | 3478 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,521 psi | 87% | 3419 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,622 psi | 87% | 3501 fps | 97.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,156 psi | 82% | 3517 fps | 97.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,476 psi | 85% | 3320 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,172 psi | 85% | 3461 fps | 96.4% |
| Bofors RP3 | <<locked>> | 98% | 55,782 psi | 87% | 3504 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,130 psi | 88% | 3415 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,681 psi | 89% | 3517 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,041 psi | 85% | 3543 fps | 97% |
| Hodgdon H322 | <<locked>> | 86% | 54,157 psi | 85% | 3445 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,666 psi | 87% | 3468 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 98% | 57,348 psi | 90% | 3501 fps | 96.3% |
| Hodgdon H4198 | <<locked>> | 82% | 56,884 psi | 89% | 3396 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 55,303 psi | 87% | 3484 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 56,985 psi | 89% | 3563 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,751 psi | 54% | 2175 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,507 psi | 89% | 3484 fps | 98.4% |
| IMR 3031 | <<locked>> | 94% | 57,261 psi | 90% | 3543 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,882 psi | 86% | 3435 fps | 97.2% |
| IMR 4198 | <<locked>> | 86% | 55,361 psi | 87% | 3379 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 56,927 psi | 89% | 3543 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 92% | 57,348 psi | 90% | 3484 fps | 99% |
| Lovex D073.5 | <<locked>> | 86% | 54,853 psi | 86% | 3419 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 94% | 57,566 psi | 90% | 3510 fps | 99.8% |
| Lovex S060 | <<locked>> | 92% | 54,882 psi | 86% | 3389 fps | 97.7% |
| Lovex S062 | <<locked>> | 96% | 54,679 psi | 86% | 3442 fps | 98.8% |
| Norma 200 | <<locked>> | 82% | 56,173 psi | 88% | 3399 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,421 psi | 90% | 3481 fps | 99.1% |
| Norma 202 | <<locked>> | 94% | 57,232 psi | 90% | 3488 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,708 psi | 86% | 3484 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 96% | 55,027 psi | 86% | 3501 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 92% | 57,246 psi | 90% | 3510 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,637 psi | 87% | 3422 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,085 psi | 55% | 2228 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 57,145 psi | 90% | 3478 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,940 psi | 86% | 3570 fps | 97.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 3609 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 90% | 55,579 psi | 87% | 3428 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 96% | 57,464 psi | 90% | 3468 fps | 99% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3481 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 94% | 57,566 psi | 90% | 3510 fps | 99.8% |
| Shooters World Precision | <<locked>> | 96% | 54,679 psi | 86% | 3442 fps | 98.8% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 57,450 psi | 90% | 3435 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,680 psi | 87% | 3084 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,333 psi | 88% | 3474 fps | 99.9% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3540 fps | 97.9% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,898 psi | 88% | 3435 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,623 psi | 89% | 3451 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,376 psi | 88% | 3484 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,463 psi | 87% | 3369 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,100 psi | 86% | 3356 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,434 psi | 87% | 3465 fps | 99% |
| Somchem S335 | <<locked>> | 92% | 54,839 psi | 86% | 3366 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,521 psi | 87% | 3442 fps | 97.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3481 fps | 98.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,611 psi | 64% | 3251 fps | 96.1% |
| Vihtavuori N120 | <<locked>> | 82% | 56,507 psi | 89% | 3317 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 55,463 psi | 87% | 3353 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,085 psi | 86% | 3356 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,985 psi | 88% | 3448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 57,464 psi | 90% | 3455 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3406 fps | 99% |
| Vihtavuori N530 | <<locked>> | 90% | 54,563 psi | 86% | 3425 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 96% | 56,043 psi | 88% | 3448 fps | 99.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,139 psi | 77% | 3307 fps | 97% |
| Winchester 748 | <<locked>> | 92% | 57,217 psi | 90% | 3537 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,304 psi | 88% | 3497 fps | 98.5% |
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% | 41,611 psi | 65% | 3130 fps | 99.8% |
| Accurate 2200 | <<locked>> | 80% | 52,112 psi | 82% | 3419 fps | 96.1% |
| Accurate 2230 | <<locked>> | 80% | 53,229 psi | 83% | 3432 fps | 96.8% |
| Accurate 2460 | <<locked>> | 80% | 45,368 psi | 71% | 3235 fps | 98.8% |
| Accurate 2495 | <<locked>> | 80% | 35,288 psi | 55% | 3025 fps | 99.1% |
| Accurate 2520 | <<locked>> | 80% | 38,841 psi | 61% | 3136 fps | 97% |
| Accurate 2520 | <<locked>> | 80% | 38,841 psi | 61% | 3136 fps | 97% |
| Accurate 4064 | <<locked>> | 80% | 33,257 psi | 52% | 2989 fps | 96.4% |
| Accurate LT-30 | <<locked>> | 80% | 48,892 psi | 77% | 3225 fps | 99.9% |
| Accurate LT-32 | <<locked>> | 80% | 49,269 psi | 77% | 3245 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 86% | 45,730 psi | 72% | 3281 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 53,809 psi | 84% | 3333 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 49,110 psi | 77% | 3330 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 48,907 psi | 77% | 3346 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,827 psi | 62% | 3117 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 80% | 38,479 psi | 60% | 3156 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,600 psi | 71% | 3350 fps | 96.2% |
| Alliant Power Pro 2000-MR | 45.6 gr | 92% | 50,676 psi | 79% | 3491 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 40,277 psi | 63% | 3176 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,630 psi | 73% | 3258 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 46,267 psi | 73% | 3310 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 45,701 psi | 72% | 3376 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,080 psi | 75% | 3205 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 50,734 psi | 80% | 3396 fps | 95.7% |
| Bofors RP3 | <<locked>> | 88% | 40,451 psi | 63% | 3186 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,829 psi | 66% | 3123 fps | 96.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,145 psi | 60% | 3127 fps | 95.5% |
| Hodgdon CFE223 | 42.6 gr | 84% | 47,355 psi | 74% | 3402 fps | 95.4% |
| Hodgdon H322 | <<locked>> | 80% | 45,049 psi | 71% | 3268 fps | 99.5% |
| Hodgdon H335 | <<locked>> | 80% | 45,745 psi | 72% | 3278 fps | 99% |
| Hodgdon H380 | <<locked>> | 96% | 53,606 psi | 84% | 3435 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 53,592 psi | 84% | 3337 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 84% | 43,366 psi | 68% | 3238 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 41,539 psi | 65% | 3241 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 40% | 1949 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 44,324 psi | 69% | 3238 fps | 95.8% |
| IMR 3031 | <<locked>> | 80% | 36,709 psi | 58% | 3130 fps | 98.7% |
| IMR 4064 | <<locked>> | 90% | 45,890 psi | 72% | 3255 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 46,688 psi | 73% | 3225 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 44,614 psi | 70% | 3291 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 39,827 psi | 62% | 3117 fps | 95.3% |
| Lovex D073.5 | <<locked>> | 80% | 44,976 psi | 70% | 3228 fps | 97.8% |
| Lovex D073.6 | <<locked>> | 80% | 36,564 psi | 57% | 3077 fps | 96.3% |
| Lovex S060 | <<locked>> | 84% | 43,540 psi | 68% | 3156 fps | 95% |
| Lovex S062 | <<locked>> | 84% | 38,406 psi | 60% | 3091 fps | 95% |
| Norma 200 | <<locked>> | 80% | 52,939 psi | 83% | 3343 fps | 100% |
| Norma 201 | <<locked>> | 82% | 40,161 psi | 63% | 3120 fps | 95.5% |
| Norma 202 | <<locked>> | 80% | 37,405 psi | 59% | 3077 fps | 97.3% |
| Norma 203B | <<locked>> | 90% | 45,527 psi | 71% | 3301 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 90% | 45,498 psi | 71% | 3310 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 44,135 psi | 69% | 3248 fps | 95.1% |
| Ramshot X-Terminator | <<locked>> | 82% | 46,050 psi | 72% | 3228 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,179 psi | 41% | 1998 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,440 psi | 70% | 3232 fps | 98% |
| ReloadSwiss RS 52 | 43.2 gr | 90% | 48,225 psi | 76% | 3432 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 37,782 psi | 59% | 3186 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 41,684 psi | 65% | 3143 fps | 98% |
| Rottweil R 902 | <<locked>> | 84% | 40,712 psi | 64% | 3123 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 92% | 42,873 psi | 67% | 3235 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,564 psi | 57% | 3077 fps | 96.3% |
| Shooters World Precision | <<locked>> | 84% | 38,406 psi | 60% | 3091 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,036 psi | 74% | 3241 fps | 96.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,823 psi | 83% | 3041 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,487 psi | 78% | 3350 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 44,193 psi | 69% | 3287 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,789 psi | 73% | 3271 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 52,953 psi | 83% | 3386 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 44,106 psi | 69% | 3238 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,044 psi | 61% | 3035 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,184 psi | 50% | 2867 fps | 96.7% |
| Somchem S321 | <<locked>> | 80% | 42,757 psi | 67% | 3205 fps | 96.6% |
| Somchem S335 | <<locked>> | 80% | 38,740 psi | 61% | 3041 fps | 98.4% |
| Somchem S341 | <<locked>> | 86% | 45,556 psi | 71% | 3251 fps | 95.5% |
| Somchem S355 | <<locked>> | 92% | 43,627 psi | 68% | 3238 fps | 95.7% |
| Somchem S365 | <<locked>> | 98% | 38,247 psi | 60% | 3189 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 53,563 psi | 84% | 3271 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,976 psi | 69% | 3146 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,914 psi | 61% | 3045 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 80% | 34,490 psi | 54% | 3012 fps | 98.9% |
| Vihtavuori N140 | <<locked>> | 80% | 35,360 psi | 55% | 3002 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 88% | 37,101 psi | 58% | 3048 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 39,769 psi | 62% | 3110 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 34,156 psi | 54% | 2976 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 43,221 psi | 68% | 3179 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 38,435 psi | 60% | 3146 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 86% | 43,482 psi | 68% | 3241 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 86 powders for .25 WSSM loaded with the .257 | 75gr | Barnes X. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,629 fps; across all powders the maximum-charge window runs from 2,175 fps to 3,629 fps. Alliant Reloder-17 gives the best case fill at 100 %, and 86 of the 86 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 75.0 gr projectile in 0.257" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-17, Hodgdon TrailBoss, ReloadSwiss RS 14 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 | 75gr | Barnes X 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.