Load Specifications
Load data in caliber .25 Creedmoor with .257 | 115gr | Berger VLD Hunting bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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>> | 82% | 52,895 psi | 85% | 2720 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,013 psi | 89% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,808 psi | 85% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,070 psi | 87% | 2789 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,945 psi | 68% | 2684 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 54,868 psi | 88% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,636 psi | 88% | 2920 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,027 psi | 89% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 52,794 psi | 85% | 2815 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,273 psi | 88% | 2818 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,201 psi | 89% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,926 psi | 89% | 2989 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 52,794 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,374 psi | 86% | 2861 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2979 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,563 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,132 psi | 65% | 2717 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,034 psi | 73% | 2881 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,129 psi | 89% | 2884 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 53,403 psi | 86% | 2854 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,722 psi | 87% | 2825 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,782 psi | 90% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,737 psi | 87% | 2851 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,463 psi | 89% | 2946 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,288 psi | 88% | 2864 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 54,128 psi | 87% | 2920 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 54,839 psi | 88% | 2881 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 55,637 psi | 90% | 2874 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,170 psi | 84% | 2851 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,230 psi | 89% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,578 psi | 88% | 2953 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 57% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,447 psi | 86% | 2828 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,912 psi | 90% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,637 psi | 90% | 2848 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,709 psi | 90% | 2831 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 53,780 psi | 87% | 2848 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,332 psi | 89% | 2854 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,129 psi | 89% | 2910 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 54,752 psi | 88% | 2890 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,273 psi | 88% | 2818 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,158 psi | 89% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,563 psi | 88% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,492 psi | 90% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,955 psi | 89% | 2851 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 55,883 psi | 90% | 2887 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 53,838 psi | 87% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,404 psi | 88% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 88% | 52,634 psi | 85% | 2844 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 54,273 psi | 88% | 2894 fps | 96% |
| Norma URP | <<locked>> | 98% | 53,824 psi | 87% | 2907 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 53,069 psi | 86% | 2871 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,057 psi | 90% | 2956 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 54,317 psi | 88% | 2835 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,172 psi | 87% | 2854 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,940 psi | 89% | 2818 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,447 psi | 88% | 2844 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,983 psi | 87% | 2927 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,330 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,534 psi | 88% | 2946 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,940 psi | 87% | 2969 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,158 psi | 89% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,360 psi | 88% | 2808 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,287 psi | 86% | 2844 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,722 psi | 87% | 2825 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,955 psi | 89% | 2851 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,158 psi | 89% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,492 psi | 90% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,883 psi | 90% | 2887 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,853 psi | 88% | 2904 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 52,765 psi | 85% | 2812 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,766 psi | 87% | 2841 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,361 psi | 89% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,796 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,230 psi | 89% | 2805 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 55,332 psi | 89% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,694 psi | 88% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,286 psi | 84% | 2802 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 53,766 psi | 87% | 2848 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,822 psi | 84% | 2913 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,167 psi | 78% | 2789 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 55,230 psi | 89% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,622 psi | 90% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,143 psi | 87% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,056 psi | 89% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,230 psi | 89% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 52,852 psi | 85% | 2854 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 54,752 psi | 88% | 2818 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,055 psi | 86% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,448 psi | 89% | 2913 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,135 psi | 71% | 2792 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,765 psi | 85% | 2828 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,708 psi | 88% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,128 psi | 87% | 2920 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,824 psi | 58% | 2717 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,635 psi | 87% | 2848 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% | 49,443 psi | 80% | 2671 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,409 psi | 68% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,371 psi | 80% | 2753 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,500 psi | 77% | 2680 fps | 95.5% |
| Accurate 3100 | <<locked>> | 98% | 39,044 psi | 63% | 2625 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,118 psi | 65% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,808 psi | 55% | 2526 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,571 psi | 74% | 2707 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,798 psi | 63% | 2556 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,674 psi | 77% | 2713 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,283 psi | 78% | 2700 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,640 psi | 67% | 2743 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,696 psi | 62% | 2585 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,292 psi | 67% | 2644 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,910 psi | 55% | 2536 fps | 95.5% |
| Alliant Reloder-17 | 36.3 gr | 80% | 33,257 psi | 54% | 2549 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,385 psi | 47% | 2438 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,419 psi | 59% | 2684 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,063 psi | 73% | 2717 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 38,247 psi | 62% | 2585 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 44,454 psi | 72% | 2664 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,385 psi | 80% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,746 psi | 75% | 2740 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,866 psi | 84% | 2887 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,131 psi | 63% | 2589 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 90% | 44,266 psi | 71% | 2746 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 90% | 48,080 psi | 78% | 2766 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,021 psi | 74% | 2720 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,428 psi | 47% | 2385 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,250 psi | 68% | 2694 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 90% | 43,961 psi | 71% | 2762 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 43% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,164 psi | 71% | 2671 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,079 psi | 74% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,756 psi | 66% | 2592 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,366 psi | 70% | 2615 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 44,512 psi | 72% | 2687 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,410 psi | 70% | 2644 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 32,648 psi | 53% | 2480 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,293 psi | 68% | 2674 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,674 psi | 77% | 2713 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,063 psi | 73% | 2690 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,614 psi | 74% | 2644 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 40,814 psi | 66% | 2598 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,014 psi | 61% | 2539 fps | 95.3% |
| Lovex S070 | <<locked>> | 90% | 43,656 psi | 70% | 2677 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,831 psi | 72% | 2664 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,208 psi | 73% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,654 psi | 66% | 2631 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 50,720 psi | 82% | 2838 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,127 psi | 55% | 2526 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 40,379 psi | 65% | 2648 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 40,306 psi | 65% | 2674 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 47,848 psi | 77% | 2726 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,268 psi | 76% | 2743 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,590 psi | 83% | 2766 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,876 psi | 43% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,032 psi | 68% | 2625 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,816 psi | 71% | 2753 fps | 98.8% |
| ReloadSwiss RS 60 | 36.3 gr | 80% | 35,389 psi | 57% | 2615 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,824 psi | 58% | 2595 fps | 95.8% |
| ReloadSwiss RS 70 | 40.6 gr | 88% | 38,435 psi | 62% | 2664 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 48,776 psi | 79% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,670 psi | 69% | 2615 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,143 psi | 58% | 2533 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 44,454 psi | 72% | 2664 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,014 psi | 61% | 2539 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,063 psi | 73% | 2690 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,814 psi | 66% | 2598 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,656 psi | 70% | 2677 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,057 psi | 60% | 2582 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,238 psi | 75% | 2703 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,295 psi | 71% | 2680 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,224 psi | 75% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,551 psi | 62% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,554 psi | 69% | 2589 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,851 psi | 84% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,774 psi | 74% | 2612 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,890 psi | 74% | 2697 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,883 psi | 59% | 2536 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 26,905 psi | 43% | 2369 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 45,005 psi | 73% | 2733 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,083 psi | 84% | 2671 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,586 psi | 75% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,337 psi | 68% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,873 psi | 69% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,143 psi | 57% | 2474 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 84% | 35,636 psi | 57% | 2533 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 47,863 psi | 77% | 2710 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,220 psi | 66% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,128 psi | 57% | 2533 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 31,618 psi | 51% | 2516 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,096 psi | 50% | 2398 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 47,863 psi | 77% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,266 psi | 71% | 2746 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,501 psi | 48% | 2516 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,656 psi | 70% | 2680 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 97 powders for .25 Creedmoor loaded with the .257 | 115gr | Berger VLD Hunting. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,989 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 57–90 %, 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 Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .25 Creedmoor 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.