Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:115 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.25 WSSM load data
Case Length (l3):1.67"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:54.3 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:9.5
Load data in caliber .25 WSSM with .257 | 115gr | Berger VLD Hunting bullet and 101 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 Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 84% | 55,782 psi | 87% | 2785 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,725 psi | 90% | 2861 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,476 psi | 85% | 2808 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,275 psi | 88% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,029 psi | 89% | 2861 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,437 psi | 65% | 2700 fps | 96% |
| Accurate 4064 | <<locked>> | 90% | 54,215 psi | 85% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,056 psi | 85% | 2940 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,534 psi | 85% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,767 psi | 87% | 2887 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,985 psi | 89% | 2887 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,737 psi | 86% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,143 psi | 85% | 3002 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,288 psi | 87% | 2897 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,680 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,362 psi | 88% | 2933 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 2995 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,753 psi | 89% | 3038 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,508 psi | 62% | 2726 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,367 psi | 70% | 2894 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,462 psi | 85% | 2900 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 56,405 psi | 88% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,695 psi | 89% | 2897 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,376 psi | 87% | 2822 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,724 psi | 89% | 2920 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,795 psi | 86% | 2966 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 92% | 57,696 psi | 90% | 2943 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 98% | 56,898 psi | 89% | 2992 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 96% | 57,682 psi | 90% | 2953 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 55,129 psi | 86% | 2897 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,764 psi | 81% | 2874 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,578 psi | 86% | 2930 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,925 psi | 85% | 2969 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 56% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,536 psi | 89% | 2900 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,419 psi | 87% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,085 psi | 86% | 2867 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,230 psi | 87% | 2851 fps | 97.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 2923 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,071 psi | 86% | 2877 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2933 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 54,186 psi | 85% | 2910 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,985 psi | 89% | 2887 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,522 psi | 90% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,578 psi | 86% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,725 psi | 90% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,998 psi | 86% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,244 psi | 85% | 2867 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 55,056 psi | 86% | 2900 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 56,971 psi | 89% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,551 psi | 90% | 2884 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,535 psi | 87% | 2920 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2972 fps | 96.6% |
| Norma URPᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2979 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 56,289 psi | 88% | 2946 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,477 psi | 87% | 2976 fps | 98.8% |
| Ramshot TAC | <<locked>> | 86% | 57,595 psi | 90% | 2910 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,116 psi | 90% | 2927 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,462 psi | 85% | 2838 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 57% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,608 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,215 psi | 85% | 2871 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,072 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,536 psi | 89% | 3035 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 3018 fps | 99.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3051 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,418 psi | 85% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,464 psi | 90% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,260 psi | 88% | 2917 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,695 psi | 89% | 2897 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,244 psi | 85% | 2867 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,578 psi | 86% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,998 psi | 86% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,056 psi | 86% | 2900 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,476 psi | 85% | 2927 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,057 psi | 88% | 2890 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,695 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,013 psi | 86% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,274 psi | 87% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,520 psi | 85% | 2818 fps | 97.8% |
| Somchem S321 | <<locked>> | 82% | 54,795 psi | 86% | 2871 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,302 psi | 85% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,535 psi | 87% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,724 psi | 89% | 2917 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2933 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2808 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 82% | 54,592 psi | 86% | 2730 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,245 psi | 87% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,406 psi | 90% | 2844 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,563 psi | 86% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,476 psi | 85% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,680 psi | 87% | 2923 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 54,302 psi | 85% | 2841 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,347 psi | 88% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,969 psi | 86% | 2933 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,337 psi | 68% | 2805 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,130 psi | 88% | 2904 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,157 psi | 85% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,305 psi | 90% | 2999 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,418 psi | 56% | 2730 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,536 psi | 89% | 2920 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% | 49,226 psi | 77% | 2694 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,041 psi | 85% | 2812 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,105 psi | 66% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,936 psi | 77% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,021 psi | 74% | 2697 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 38,595 psi | 60% | 2641 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,784 psi | 62% | 2618 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,431 psi | 52% | 2543 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,281 psi | 71% | 2730 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,580 psi | 60% | 2579 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,340 psi | 74% | 2736 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,979 psi | 75% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | 37.4 gr | 80% | 41,234 psi | 65% | 2759 fps | 98.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,876 psi | 72% | 2743 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,101 psi | 60% | 2598 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,002 psi | 64% | 2664 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,649 psi | 53% | 2552 fps | 95.3% |
| Alliant Reloder-17 | 36.8 gr | 80% | 32,924 psi | 52% | 2566 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,966 psi | 49% | 2510 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,042 psi | 56% | 2700 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,614 psi | 70% | 2733 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 37,927 psi | 59% | 2605 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 46,978 psi | 74% | 2736 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,168 psi | 77% | 2723 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,311 psi | 73% | 2759 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,314 psi | 80% | 2907 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 38,798 psi | 61% | 2608 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 90% | 43,627 psi | 68% | 2759 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 47,514 psi | 74% | 2782 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,745 psi | 72% | 2740 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,964 psi | 45% | 2398 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,843 psi | 66% | 2713 fps | 99.4% |
| Hodgdon Superformance | 44.8 gr | 92% | 46,876 psi | 73% | 2844 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 41% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,859 psi | 69% | 2690 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,411 psi | 71% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,524 psi | 64% | 2612 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,076 psi | 68% | 2635 fps | 95.2% |
| IMR 4350 | <<locked>> | 92% | 44,309 psi | 69% | 2710 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,047 psi | 67% | 2661 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 34,577 psi | 54% | 2552 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 42,018 psi | 66% | 2694 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,340 psi | 74% | 2736 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,925 psi | 85% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,643 psi | 70% | 2710 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,397 psi | 71% | 2667 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 40,567 psi | 64% | 2618 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,724 psi | 59% | 2559 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 43,149 psi | 68% | 2694 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,585 psi | 70% | 2684 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,628 psi | 70% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,393 psi | 63% | 2651 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 50,299 psi | 79% | 2854 fps | 95% |
| Norma URP | <<locked>> | 84% | 33,765 psi | 53% | 2546 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 39,972 psi | 63% | 2664 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 40,074 psi | 63% | 2694 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,456 psi | 74% | 2746 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,833 psi | 73% | 2762 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,169 psi | 80% | 2785 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,934 psi | 42% | 1617 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,055 psi | 83% | 2815 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,655 psi | 65% | 2644 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,410 psi | 68% | 2772 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,041 psi | 55% | 2635 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,621 psi | 56% | 2618 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,927 psi | 59% | 2677 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 48,573 psi | 76% | 2723 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,438 psi | 67% | 2635 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,607 psi | 56% | 2546 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 46,978 psi | 74% | 2736 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,724 psi | 59% | 2559 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,643 psi | 70% | 2710 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,567 psi | 64% | 2618 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,149 psi | 68% | 2694 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,709 psi | 58% | 2598 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,803 psi | 72% | 2720 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,947 psi | 69% | 2700 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,701 psi | 72% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,101 psi | 60% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,076 psi | 66% | 2605 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,401 psi | 81% | 2818 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,527 psi | 71% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,440 psi | 71% | 2717 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,637 psi | 57% | 2556 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 26,498 psi | 42% | 2379 fps | 95.6% |
| Somchem S385 | <<locked>> | 98% | 44,585 psi | 70% | 2753 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,532 psi | 81% | 2690 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,006 psi | 72% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,785 psi | 65% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,264 psi | 66% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,621 psi | 54% | 2487 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 35,302 psi | 55% | 2549 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 47,558 psi | 75% | 2733 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,886 psi | 64% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,737 psi | 54% | 2549 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 90% | 31,198 psi | 49% | 2530 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,792 psi | 48% | 2415 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 47,442 psi | 74% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,990 psi | 69% | 2769 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,240 psi | 46% | 2530 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,265 psi | 68% | 2700 fps | 99.4% |
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 101 powders for .25 WSSM loaded with the .257 | 115gr | Berger VLD Hunting. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,051 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.257" calls for a 1:9.5 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, Alliant Reloder-17 rank at the top here: for .25 WSSM with the .257 | 115gr | Berger VLD Hunting 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.