Load Specifications
Load data in caliber .25 WSSM with .257 | 60gr | Winchester Hollow Point bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H322, SNPE Vectan SP 10 and ADI AR 2219.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 84% | 54,346 psi | 85% | 3629 fps | 100% |
| Accurate 2015 | <<locked>> | 98% | 56,260 psi | 88% | 3743 fps | 100% |
| Accurate 2460 | <<locked>> | 94% | 55,695 psi | 87% | 3750 fps | 98.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 48,443 psi | 76% | 3652 fps | 99.7% |
| Accurate 2520 | <<locked>> | 98% | 56,724 psi | 89% | 3802 fps | 98.6% |
| Accurate 4064ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 3596 fps | 97.5% |
| Accurate LT-30 | <<locked>> | 90% | 55,071 psi | 86% | 3652 fps | 99.5% |
| Accurate LT-32 | <<locked>> | 90% | 55,492 psi | 87% | 3665 fps | 98.3% |
| ADI APS 450 | <<locked>> | 82% | 57,392 psi | 90% | 2956 fps | 100% |
| ADI AR 2207 | <<locked>> | 88% | 54,940 psi | 86% | 3714 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 54,099 psi | 85% | 3770 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 98% | 55,579 psi | 87% | 3757 fps | 96.8% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 56,579 psi | 89% | 3842 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 94% | 55,767 psi | 87% | 3885 fps | 96.1% |
| Alliant Reloder-10x | <<locked>> | 94% | 56,420 psi | 88% | 3786 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 88% | 56,942 psi | 89% | 3727 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 54,114 psi | 85% | 3622 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 96% | 54,984 psi | 86% | 3698 fps | 97.3% |
| Hodgdon BL-C2 | <<locked>> | 98% | 53,838 psi | 84% | 3773 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 94% | 56,130 psi | 88% | 3806 fps | 99.5% |
| Hodgdon H335 | <<locked>> | 92% | 54,099 psi | 85% | 3757 fps | 98.7% |
| Hodgdon H4198 | <<locked>> | 88% | 57,000 psi | 89% | 3720 fps | 99.3% |
| Hodgdon H4895ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3806 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,692 psi | 51% | 2382 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 3822 fps | 99.7% |
| IMR 4198 | <<locked>> | 94% | 57,145 psi | 90% | 3757 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 56,507 psi | 89% | 3681 fps | 100% |
| IMR 8208 XBR | <<locked>> | 98% | 55,579 psi | 87% | 3757 fps | 96.8% |
| Lovex D073.4 | <<locked>> | 88% | 56,028 psi | 88% | 3780 fps | 98.2% |
| Lovex D073.5 | <<locked>> | 94% | 56,043 psi | 88% | 3750 fps | 97.8% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3763 fps | 98.2% |
| Lovex S053 | <<locked>> | 84% | 55,071 psi | 86% | 3615 fps | 100% |
| Norma 200 | <<locked>> | 90% | 56,623 psi | 89% | 3760 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 3730 fps | 96.6% |
| Norma 202ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3757 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,648 psi | 51% | 2434 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 56,942 psi | 89% | 3717 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 94% | 55,709 psi | 87% | 3766 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 98% | 54,911 psi | 86% | 3743 fps | 98.6% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 50,908 psi | 80% | 3648 fps | 95.8% |
| Shooters World AR Plus | <<locked>> | 88% | 56,028 psi | 88% | 3780 fps | 98.2% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3763 fps | 98.2% |
| Shooters World Tactical Rifle | <<locked>> | 92% | 56,826 psi | 89% | 3724 fps | 96.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 55,085 psi | 86% | 3422 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 90% | 54,868 psi | 86% | 3770 fps | 98.7% |
| SNPE Vectan SP 3 | <<locked>> | 94% | 57,464 psi | 90% | 3802 fps | 99.9% |
| SNPE Vectan Tubal 3000ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3711 fps | 99% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 46,470 psi | 73% | 3504 fps | 98.3% |
| Somchem S321 | <<locked>> | 96% | 57,508 psi | 90% | 3806 fps | 97.5% |
| Somchem S335ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3701 fps | 99.4% |
| Vihtavuori N120 | <<locked>> | 88% | 54,882 psi | 86% | 3648 fps | 100% |
| Vihtavuori N130 | <<locked>> | 96% | 57,101 psi | 89% | 3714 fps | 100% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3707 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 48,747 psi | 76% | 3658 fps | 99.7% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3665 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 98% | 56,637 psi | 89% | 3763 fps | 97% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 50,154 psi | 79% | 3645 fps | 98% |
| Winchester 748 | <<locked>> | 98% | 54,665 psi | 86% | 3802 fps | 97.6% |
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 1680 | <<locked>> | 80% | 47,485 psi | 74% | 3501 fps | 99.8% |
| Accurate 2015 | <<locked>> | 80% | 31,386 psi | 49% | 3166 fps | 95.4% |
| Accurate 2460 | <<locked>> | 84% | 39,218 psi | 61% | 3396 fps | 95% |
| Accurate 2495 | <<locked>> | 86% | 29,660 psi | 46% | 3169 fps | 95.1% |
| Accurate 2520 | <<locked>> | 90% | 42,337 psi | 66% | 3507 fps | 95.5% |
| Accurate 4064 | <<locked>> | 94% | 36,593 psi | 57% | 3389 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 40,321 psi | 63% | 3340 fps | 97% |
| Accurate LT-32 | <<locked>> | 82% | 43,033 psi | 67% | 3406 fps | 95.6% |
| ADI APS 450 | <<locked>> | 80% | 55,753 psi | 87% | 2930 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 42,743 psi | 67% | 3481 fps | 100% |
| ADI AR 2219 | 37.9 gr | 80% | 38,174 psi | 60% | 3412 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 94% | 48,573 psi | 76% | 3615 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 28,761 psi | 45% | 3176 fps | 97.1% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 52,214 psi | 82% | 3816 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 35,969 psi | 56% | 3337 fps | 98.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 44,063 psi | 69% | 3478 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 38,943 psi | 61% | 3301 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 90% | 45,643 psi | 72% | 3504 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 94% | 46,514 psi | 73% | 3622 fps | 95.4% |
| Hodgdon H322 | 37.6 gr | 82% | 37,304 psi | 58% | 3389 fps | 95.7% |
| Hodgdon H335 | <<locked>> | 84% | 40,872 psi | 64% | 3471 fps | 95.8% |
| Hodgdon H4198 | <<locked>> | 80% | 44,425 psi | 70% | 3461 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 98% | 52,663 psi | 83% | 3737 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,047 psi | 38% | 2142 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 33,460 psi | 52% | 3337 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 37,333 psi | 59% | 3343 fps | 99.1% |
| IMR 4227 | <<locked>> | 80% | 49,893 psi | 78% | 3566 fps | 100% |
| IMR 8208 XBR | <<locked>> | 94% | 48,573 psi | 76% | 3615 fps | 95.1% |
| Lovex D073.4 | <<locked>> | 82% | 44,773 psi | 70% | 3550 fps | 95.8% |
| Lovex D073.5 | <<locked>> | 88% | 45,005 psi | 71% | 3527 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 94% | 43,381 psi | 68% | 3547 fps | 95.8% |
| Lovex S053 | <<locked>> | 80% | 48,747 psi | 76% | 3504 fps | 100% |
| Norma 200 | <<locked>> | 80% | 40,930 psi | 64% | 3448 fps | 99.5% |
| Norma 201 | <<locked>> | 96% | 47,718 psi | 75% | 3596 fps | 95% |
| Norma 202 | <<locked>> | 90% | 39,073 psi | 61% | 3422 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,873 psi | 37% | 2185 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 50,140 psi | 79% | 3596 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 42,482 psi | 67% | 3484 fps | 95% |
| Rottweil R 901 | <<locked>> | 88% | 40,611 psi | 64% | 3428 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 98% | 48,051 psi | 75% | 3589 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 82% | 44,773 psi | 70% | 3550 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 43,381 psi | 68% | 3547 fps | 95.8% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 52,808 psi | 83% | 3648 fps | 95.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 44,498 psi | 70% | 3248 fps | 100% |
| SNPE Vectan SP 10 | 40.2 gr | 82% | 41,669 psi | 65% | 3484 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 36,492 psi | 57% | 3343 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 39,247 psi | 62% | 3333 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 35,781 psi | 56% | 3251 fps | 95.4% |
| Somchem S321 | <<locked>> | 90% | 46,383 psi | 73% | 3586 fps | 95% |
| Somchem S335 | <<locked>> | 86% | 35,955 psi | 56% | 3261 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 42,786 psi | 67% | 3428 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 34,505 psi | 54% | 3225 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 82% | 32,068 psi | 50% | 3159 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 86% | 30,545 psi | 48% | 3199 fps | 95.3% |
| Vihtavuori N140 | <<locked>> | 90% | 37,130 psi | 58% | 3340 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 94% | 49,240 psi | 77% | 3619 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 94% | 41,031 psi | 64% | 3445 fps | 95.8% |
| Winchester 748 | <<locked>> | 92% | 44,324 psi | 69% | 3583 fps | 95% |
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 58 powders for .25 WSSM loaded with the .257 | 60gr | Winchester Hollow Point. Alliant Power Pro 1200-R delivers the highest muzzle velocity at 3,885 fps; across all powders the maximum-charge window runs from 2,382 fps to 3,885 fps. Accurate 2495 gives the best case fill at 100 %, and 58 of the 58 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 60.0 gr projectile in 0.257" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Alliant AR-Comp 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. Hodgdon H322, SNPE Vectan SP 10, ADI AR 2219 rank at the top here: for .25 WSSM with the .257 | 60gr | Winchester Hollow 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.