Load Specifications
Load data in caliber .25 WSSM with .257 | 118gr | Peregrine Bushmaster (VRG-3) bullet and 100 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, Hodgdon Superformance 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 55,288 psi | 87% | 2749 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,159 psi | 90% | 2825 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,406 psi | 90% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,825 psi | 87% | 2841 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,768 psi | 89% | 2828 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,901 psi | 64% | 2664 fps | 96.2% |
| Accurate 4064 | <<locked>> | 92% | 57,159 psi | 90% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,693 psi | 84% | 2907 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 54,636 psi | 86% | 2858 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,593 psi | 87% | 2854 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,145 psi | 90% | 2858 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,418 psi | 85% | 2779 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,462 psi | 85% | 2979 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,448 psi | 87% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,057 psi | 88% | 2900 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2969 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,681 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,131 psi | 61% | 2697 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,034 psi | 69% | 2861 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,273 psi | 85% | 2871 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 56,028 psi | 88% | 2890 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,391 psi | 88% | 2867 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,100 psi | 86% | 2785 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,420 psi | 88% | 2884 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,042 psi | 86% | 2936 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 92% | 57,363 psi | 90% | 2910 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 98% | 56,811 psi | 89% | 2959 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 96% | 57,609 psi | 90% | 2923 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,201 psi | 87% | 2867 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2841 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,795 psi | 86% | 2900 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,824 psi | 84% | 2943 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,549 psi | 56% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,333 psi | 88% | 2867 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,129 psi | 86% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,245 psi | 87% | 2841 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,984 psi | 86% | 2818 fps | 98.1% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,840 psi | 89% | 2894 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,940 psi | 86% | 2848 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 2897 fps | 99.8% |
| IMR 4895 | <<locked>> | 90% | 57,508 psi | 90% | 2927 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,145 psi | 90% | 2858 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,043 psi | 89% | 2835 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,070 psi | 85% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,537 psi | 90% | 2831 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,592 psi | 86% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,522 psi | 90% | 2887 fps | 99.3% |
| Lovex S070 | <<locked>> | 98% | 55,143 psi | 86% | 2874 fps | 98.4% |
| Norma 201 | <<locked>> | 88% | 56,478 psi | 89% | 2848 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,203 psi | 90% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,230 psi | 87% | 2884 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,479 psi | 90% | 2943 fps | 96.9% |
| Norma URPᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2949 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 56,144 psi | 88% | 2913 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2946 fps | 99% |
| Ramshot TAC | <<locked>> | 86% | 57,377 psi | 90% | 2881 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,913 psi | 89% | 2894 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,186 psi | 85% | 2805 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 56% | 1778 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,347 psi | 88% | 2831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,522 psi | 90% | 2890 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,869 psi | 89% | 2969 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,492 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 2989 fps | 99.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3022 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 86% | 57,305 psi | 90% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,014 psi | 89% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,898 psi | 88% | 2881 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,391 psi | 88% | 2867 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,522 psi | 90% | 2887 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,070 psi | 85% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,592 psi | 86% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,143 psi | 86% | 2874 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,317 psi | 85% | 2894 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,767 psi | 87% | 2858 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,492 psi | 89% | 2877 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,650 psi | 86% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,042 psi | 86% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,186 psi | 85% | 2789 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 54,433 psi | 85% | 2831 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,435 psi | 90% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,332 psi | 87% | 2844 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,376 psi | 88% | 2881 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2900 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,340 psi | 74% | 2776 fps | 96.1% |
| Vihtavuori N130 | <<locked>> | 82% | 54,607 psi | 86% | 2700 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,984 psi | 86% | 2723 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,014 psi | 89% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,230 psi | 85% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,230 psi | 85% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,535 psi | 87% | 2890 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 57,725 psi | 90% | 2858 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,057 psi | 88% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,737 psi | 86% | 2900 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,931 psi | 67% | 2772 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,072 psi | 88% | 2874 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,624 psi | 90% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,246 psi | 90% | 2966 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,940 psi | 55% | 2697 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,347 psi | 88% | 2884 fps | 100% |
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% | 48,646 psi | 76% | 2657 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,476 psi | 84% | 2776 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,046 psi | 64% | 2579 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,370 psi | 76% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,644 psi | 73% | 2664 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 38,043 psi | 60% | 2605 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,870 psi | 61% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,750 psi | 51% | 2503 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,860 psi | 70% | 2694 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 38,203 psi | 60% | 2546 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,978 psi | 74% | 2700 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,558 psi | 75% | 2687 fps | 100% |
| Alliant Power Pro 2000-MR | 37.3 gr | 80% | 40,901 psi | 64% | 2730 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,898 psi | 59% | 2569 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,495 psi | 63% | 2628 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,199 psi | 52% | 2520 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,706 psi | 51% | 2536 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,674 psi | 45% | 2421 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,549 psi | 56% | 2667 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,280 psi | 69% | 2700 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 37,260 psi | 58% | 2566 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 43,569 psi | 68% | 2648 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,820 psi | 77% | 2690 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,905 psi | 72% | 2723 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,082 psi | 80% | 2874 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 38,203 psi | 60% | 2572 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 90% | 43,308 psi | 68% | 2730 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 90% | 47,282 psi | 74% | 2753 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 45,266 psi | 71% | 2703 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,398 psi | 45% | 2362 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,495 psi | 65% | 2677 fps | 99.5% |
| Hodgdon Superformance | 43.7 gr | 90% | 43,294 psi | 68% | 2749 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 41% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,540 psi | 68% | 2657 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,339 psi | 71% | 2700 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,074 psi | 63% | 2579 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,685 psi | 67% | 2602 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 44,048 psi | 69% | 2680 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,728 psi | 67% | 2631 fps | 95.3% |
| IMR 4831 | <<locked>> | 84% | 31,981 psi | 50% | 2467 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 41,510 psi | 65% | 2657 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 46,978 psi | 74% | 2700 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,359 psi | 84% | 2785 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,048 psi | 69% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,034 psi | 71% | 2635 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 39,958 psi | 63% | 2582 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 37,130 psi | 58% | 2523 fps | 95.3% |
| Lovex S070 | <<locked>> | 90% | 42,656 psi | 67% | 2657 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 43,961 psi | 69% | 2648 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,440 psi | 70% | 2654 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,885 psi | 63% | 2615 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 50,111 psi | 79% | 2825 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 33,301 psi | 52% | 2510 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,595 psi | 62% | 2631 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 39,697 psi | 62% | 2664 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,108 psi | 74% | 2713 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,470 psi | 73% | 2726 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,836 psi | 80% | 2753 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 42% | 1588 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,779 psi | 83% | 2782 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,495 psi | 65% | 2615 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,033 psi | 67% | 2736 fps | 98.8% |
| ReloadSwiss RS 60 | 36.8 gr | 80% | 34,853 psi | 55% | 2605 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,114 psi | 55% | 2582 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,826 psi | 59% | 2651 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 47,776 psi | 75% | 2684 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,785 psi | 65% | 2598 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,186 psi | 55% | 2513 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 43,569 psi | 68% | 2648 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,130 psi | 58% | 2523 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,048 psi | 69% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,958 psi | 63% | 2582 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 90% | 42,656 psi | 67% | 2657 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,260 psi | 57% | 2566 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,295 psi | 71% | 2687 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,584 psi | 68% | 2667 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,237 psi | 71% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,594 psi | 59% | 2464 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,568 psi | 65% | 2572 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 50,995 psi | 80% | 2782 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,962 psi | 70% | 2598 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,078 psi | 71% | 2684 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 35,998 psi | 56% | 2520 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 25,860 psi | 41% | 2343 fps | 95.6% |
| Somchem S385 | <<locked>> | 98% | 44,237 psi | 69% | 2720 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,097 psi | 80% | 2654 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,658 psi | 72% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,234 psi | 65% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,134 psi | 66% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,330 psi | 54% | 2461 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 32,489 psi | 51% | 2457 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 47,137 psi | 74% | 2700 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,422 psi | 63% | 2579 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,229 psi | 54% | 2513 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 30,589 psi | 48% | 2493 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,313 psi | 48% | 2382 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 47,108 psi | 74% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,799 psi | 64% | 2677 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,674 psi | 45% | 2497 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,873 psi | 67% | 2667 fps | 99.5% |
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 100 powders for .25 WSSM loaded with the .257 | 118gr | Peregrine Bushmaster (VRG-3). ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,742 fps to 3,022 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 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 118.0 gr projectile in 0.257" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .25 WSSM with the .257 | 118gr | Peregrine Bushmaster (VRG-3) 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.