Load Specifications
Load data in caliber .25 WSSM with .257 | 110gr | Rhino Solid Shank bullet and 96 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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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% | 55,898 psi | 88% | 2861 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,665 psi | 86% | 2884 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,563 psi | 86% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,723 psi | 86% | 2884 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,901 psi | 66% | 2772 fps | 95.9% |
| Accurate 4064 | <<locked>> | 90% | 54,737 psi | 86% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,766 psi | 86% | 3022 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 55,100 psi | 86% | 2969 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,086 psi | 88% | 2966 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,566 psi | 90% | 2969 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,824 psi | 86% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,650 psi | 86% | 3087 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,043 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,681 psi | 89% | 3012 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3077 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,217 psi | 90% | 3117 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,001 psi | 63% | 2802 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,744 psi | 70% | 2969 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,969 psi | 86% | 2982 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 57,029 psi | 89% | 3009 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,695 psi | 89% | 2972 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,724 psi | 87% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,971 psi | 89% | 2999 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,201 psi | 87% | 3045 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 57,740 psi | 90% | 3018 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 57,406 psi | 90% | 3071 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,447 psi | 85% | 2976 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 86% | 55,637 psi | 87% | 2979 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,040 psi | 82% | 2949 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,187 psi | 86% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,375 psi | 85% | 3048 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 56% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,971 psi | 89% | 2982 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,796 psi | 87% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,535 psi | 87% | 2949 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,535 psi | 87% | 2927 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 2995 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,201 psi | 87% | 2949 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3012 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 54,621 psi | 86% | 2989 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,566 psi | 90% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,969 psi | 86% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,491 psi | 85% | 2890 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,448 psi | 87% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,679 psi | 86% | 2946 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 55,695 psi | 87% | 2982 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 57,145 psi | 90% | 2963 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,653 psi | 90% | 2959 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,854 psi | 88% | 2995 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3061 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 56,681 psi | 89% | 3025 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3058 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 54,360 psi | 85% | 2933 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,711 psi | 90% | 3009 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,868 psi | 86% | 2917 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 56% | 1864 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,942 psi | 89% | 2946 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,621 psi | 86% | 2946 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,377 psi | 90% | 3084 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,768 psi | 89% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,259 psi | 85% | 3041 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,969 psi | 85% | 3071 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 84% | 54,607 psi | 86% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,609 psi | 90% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,811 psi | 89% | 2999 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,695 psi | 89% | 2972 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,679 psi | 86% | 2946 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,969 psi | 86% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,448 psi | 87% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,695 psi | 87% | 2982 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,911 psi | 86% | 3005 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,260 psi | 88% | 2963 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,985 psi | 89% | 2992 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,056 psi | 86% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,390 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,824 psi | 86% | 2894 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 55,230 psi | 87% | 2946 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,578 psi | 86% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,057 psi | 88% | 2959 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,942 psi | 89% | 2992 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 3009 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,897 psi | 86% | 2812 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,332 psi | 87% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,624 psi | 90% | 2923 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,027 psi | 86% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,056 psi | 86% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,304 psi | 88% | 3005 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 54,505 psi | 85% | 2917 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,521 psi | 89% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,027 psi | 86% | 3005 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,932 psi | 69% | 2884 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,681 psi | 89% | 2982 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,607 psi | 86% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,824 psi | 84% | 3012 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,897 psi | 56% | 2802 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,101 psi | 89% | 3002 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% | 49,240 psi | 77% | 2766 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,047 psi | 66% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,688 psi | 75% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,066 psi | 75% | 2772 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 39,146 psi | 61% | 2713 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,726 psi | 62% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,678 psi | 53% | 2608 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 45,440 psi | 71% | 2802 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,798 psi | 61% | 2648 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,471 psi | 74% | 2808 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,906 psi | 75% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | 38.9 gr | 80% | 41,452 psi | 65% | 2831 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,305 psi | 60% | 2667 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,147 psi | 64% | 2733 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,924 psi | 53% | 2621 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,141 psi | 52% | 2631 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,154 psi | 49% | 2575 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,361 psi | 57% | 2769 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,773 psi | 70% | 2805 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 38,043 psi | 60% | 2671 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 47,007 psi | 74% | 2805 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,342 psi | 77% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,557 psi | 73% | 2831 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,401 psi | 81% | 2982 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 38,841 psi | 61% | 2674 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 44,106 psi | 69% | 2838 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 51,198 psi | 80% | 2920 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 45,847 psi | 72% | 2812 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,080 psi | 46% | 2457 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,134 psi | 66% | 2785 fps | 99.4% |
| Hodgdon Superformance | 46.6 gr | 92% | 47,195 psi | 74% | 2917 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,034 psi | 69% | 2762 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 45,716 psi | 72% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,756 psi | 64% | 2684 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,149 psi | 68% | 2703 fps | 95% |
| IMR 4350 | <<locked>> | 94% | 47,355 psi | 74% | 2835 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,948 psi | 72% | 2789 fps | 95.7% |
| IMR 4831 | <<locked>> | 86% | 34,737 psi | 54% | 2618 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 42,119 psi | 66% | 2762 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,471 psi | 74% | 2808 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,686 psi | 70% | 2779 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,310 psi | 71% | 2736 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 40,509 psi | 63% | 2684 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,161 psi | 63% | 2677 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 43,453 psi | 68% | 2762 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,469 psi | 70% | 2749 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,788 psi | 70% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,509 psi | 63% | 2723 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 36,332 psi | 57% | 2671 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 40,132 psi | 63% | 2733 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 40,190 psi | 63% | 2762 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,587 psi | 75% | 2818 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,021 psi | 74% | 2835 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,343 psi | 80% | 2861 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 42% | 1663 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,519 psi | 84% | 2897 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,134 psi | 66% | 2717 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,395 psi | 68% | 2841 fps | 98.5% |
| ReloadSwiss RS 60 | 38.3 gr | 80% | 35,273 psi | 55% | 2703 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,853 psi | 56% | 2684 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,247 psi | 60% | 2749 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 48,588 psi | 76% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,424 psi | 66% | 2703 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,766 psi | 56% | 2612 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 47,007 psi | 74% | 2805 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,161 psi | 63% | 2677 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,686 psi | 70% | 2779 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,509 psi | 63% | 2684 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 43,453 psi | 68% | 2762 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,738 psi | 58% | 2664 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,934 psi | 72% | 2792 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,961 psi | 69% | 2769 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,050 psi | 72% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,363 psi | 60% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,266 psi | 71% | 2730 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 51,576 psi | 81% | 2894 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,426 psi | 71% | 2703 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,571 psi | 71% | 2785 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 36,550 psi | 57% | 2618 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 26,585 psi | 42% | 2438 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,924 psi | 81% | 2769 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,369 psi | 73% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,134 psi | 66% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,453 psi | 67% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,766 psi | 54% | 2556 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 35,534 psi | 56% | 2615 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,616 psi | 75% | 2805 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,930 psi | 64% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,867 psi | 55% | 2612 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 33,663 psi | 53% | 2654 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,908 psi | 48% | 2474 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 47,398 psi | 74% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,106 psi | 69% | 2838 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,428 psi | 46% | 2592 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,511 psi | 68% | 2772 fps | 99.3% |
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 96 powders for .25 WSSM loaded with the .257 | 110gr | Rhino Solid Shank. Alliant Reloder-17 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,117 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 110.0 gr projectile in 0.257" calls for a 1:12.0 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 | 110gr | Rhino Solid Shank 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.