Load Specifications
Load data in caliber .25 Creedmoor with .257 | 104gr | Peregrine VLR-5 bullet and 98 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, ReloadSwiss RS 60 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.
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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>> | 86% | 54,230 psi | 87% | 2887 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 52,649 psi | 85% | 2910 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,709 psi | 90% | 2953 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,737 psi | 88% | 2976 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 55,840 psi | 90% | 3002 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 3022 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 53,490 psi | 86% | 2982 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 54,563 psi | 88% | 2979 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 52,939 psi | 85% | 2940 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 52,881 psi | 85% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,244 psi | 87% | 3045 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,417 psi | 86% | 3100 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,418 psi | 88% | 3005 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,041 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,143 psi | 89% | 3028 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,473 psi | 81% | 3025 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,376 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,592 psi | 57% | 2726 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,330 psi | 86% | 2995 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 54,824 psi | 88% | 3018 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,317 psi | 89% | 2982 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,752 psi | 88% | 2923 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,376 psi | 89% | 3018 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,809 psi | 87% | 3064 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 53,417 psi | 86% | 2940 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,578 psi | 88% | 2966 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,999 psi | 90% | 3031 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,492 psi | 90% | 3077 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 88% | 54,012 psi | 87% | 2995 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,485 psi | 75% | 2894 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,156 psi | 86% | 3025 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 56% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,709 psi | 90% | 3002 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 53,577 psi | 86% | 2982 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,186 psi | 87% | 2966 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,607 psi | 88% | 2943 fps | 96.8% |
| IMR 4198 | <<locked>> | 82% | 54,636 psi | 88% | 2861 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,940 psi | 87% | 2963 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,385 psi | 80% | 2956 fps | 98.5% |
| IMR 4895 | <<locked>> | 90% | 52,895 psi | 85% | 3002 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 52,939 psi | 85% | 2940 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 52,518 psi | 85% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 52,910 psi | 85% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,621 psi | 86% | 2913 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 53,722 psi | 87% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,055 psi | 86% | 2956 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,751 psi | 87% | 2986 fps | 96.9% |
| Norma 201 | <<locked>> | 90% | 55,840 psi | 90% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 88% | 52,765 psi | 85% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,302 psi | 88% | 3015 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 51,503 psi | 83% | 3012 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 92% | 54,969 psi | 89% | 3041 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,575 psi | 82% | 3002 fps | 97% |
| Ramshot TAC | <<locked>> | 86% | 53,258 psi | 86% | 2949 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,489 psi | 85% | 2969 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,998 psi | 87% | 2940 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,186 psi | 57% | 1873 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,767 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,142 psi | 86% | 2956 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,535 psi | 90% | 3097 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,245 psi | 89% | 3136 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 3038 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,214 psi | 84% | 3068 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 86% | 53,055 psi | 86% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,927 psi | 90% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,679 psi | 88% | 3009 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 55,317 psi | 89% | 2982 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,055 psi | 86% | 2956 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 52,910 psi | 85% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,722 psi | 87% | 2963 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,751 psi | 87% | 2986 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,724 psi | 90% | 2946 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,156 psi | 86% | 3018 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 54,549 psi | 88% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,911 psi | 89% | 2979 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,709 psi | 90% | 3012 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,360 psi | 88% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,143 psi | 87% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,548 psi | 86% | 2904 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 54,027 psi | 87% | 2972 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,330 psi | 86% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,433 psi | 88% | 2972 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 54,984 psi | 89% | 3005 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,716 psi | 74% | 2953 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 53,911 psi | 87% | 2841 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,549 psi | 88% | 2867 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,637 psi | 90% | 2946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,461 psi | 86% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,345 psi | 86% | 2940 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,346 psi | 88% | 3015 fps | 99% |
| Vihtavuori N530 | <<locked>> | 86% | 53,374 psi | 86% | 2940 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,911 psi | 89% | 2956 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,098 psi | 86% | 3012 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,319 psi | 62% | 2808 fps | 96.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,230 psi | 89% | 2995 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 52,866 psi | 85% | 2986 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,492 psi | 90% | 3077 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,376 psi | 89% | 3018 fps | 99.9% |
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% | 44,817 psi | 72% | 2740 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,197 psi | 79% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,115 psi | 60% | 2644 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,150 psi | 71% | 2805 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 35,099 psi | 57% | 2631 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 36,216 psi | 58% | 2710 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 41,568 psi | 67% | 2762 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 35,128 psi | 57% | 2595 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,685 psi | 70% | 2776 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 43,178 psi | 70% | 2769 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,995 psi | 82% | 2992 fps | 99.7% |
| Alliant Power Pro 2000-MR | 37 gr | 80% | 37,434 psi | 60% | 2766 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,519 psi | 56% | 2618 fps | 96.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,807 psi | 82% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,318 psi | 60% | 2687 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,927 psi | 60% | 2730 fps | 95.2% |
| Alliant Reloder-17 | 37.4 gr | 82% | 31,894 psi | 51% | 2625 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,562 psi | 54% | 2671 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,596 psi | 65% | 2756 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 33,736 psi | 54% | 2612 fps | 96.7% |
| Bofors RP7 | <<locked>> | 96% | 51,750 psi | 83% | 2920 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,353 psi | 73% | 2769 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,974 psi | 68% | 2785 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,485 psi | 75% | 2936 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 49,850 psi | 80% | 2881 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,691 psi | 82% | 2907 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 40,074 psi | 65% | 2736 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 48,370 psi | 78% | 2953 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 41,901 psi | 68% | 2772 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,546 psi | 51% | 2562 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,695 psi | 61% | 2730 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,860 psi | 42% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,089 psi | 65% | 2720 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 41,162 psi | 66% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,825 psi | 59% | 2631 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,906 psi | 77% | 2825 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 51,387 psi | 83% | 2812 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,703 psi | 77% | 2851 fps | 95.1% |
| IMR 4831 | <<locked>> | 92% | 37,608 psi | 61% | 2723 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,203 psi | 62% | 2720 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 43,685 psi | 70% | 2776 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 49,066 psi | 79% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,059 psi | 65% | 2733 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 41,785 psi | 67% | 2700 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 36,608 psi | 59% | 2638 fps | 97.9% |
| Lovex S065 | <<locked>> | 90% | 41,321 psi | 67% | 2736 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 47,355 psi | 76% | 2874 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 40,408 psi | 65% | 2710 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 40,785 psi | 66% | 2726 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 36,695 psi | 59% | 2674 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 36,883 psi | 59% | 2720 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 36,027 psi | 58% | 2677 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 96% | 44,266 psi | 71% | 2881 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 43,584 psi | 70% | 2772 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,714 psi | 69% | 2792 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,166 psi | 76% | 2825 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,005 psi | 42% | 1673 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,805 psi | 79% | 2864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 46,543 psi | 75% | 2838 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,827 psi | 63% | 2785 fps | 96.6% |
| ReloadSwiss RS 60 | 36.5 gr | 80% | 31,821 psi | 51% | 2638 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,928 psi | 63% | 2792 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,308 psi | 68% | 2871 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 44,063 psi | 71% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,406 psi | 62% | 2661 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 31,778 psi | 51% | 2552 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 96% | 51,750 psi | 83% | 2920 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,321 psi | 67% | 2736 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,059 psi | 65% | 2733 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 36,608 psi | 59% | 2638 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 96% | 47,355 psi | 76% | 2874 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,692 psi | 83% | 2884 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,040 psi | 53% | 2608 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,496 psi | 69% | 2677 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,553 psi | 67% | 2740 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,045 psi | 65% | 2726 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,192 psi | 68% | 2677 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,838 psi | 56% | 2536 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 46,572 psi | 75% | 2789 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 46,978 psi | 76% | 2858 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 41,568 psi | 67% | 2677 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,336 psi | 67% | 2740 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 32,808 psi | 53% | 2566 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 28,776 psi | 46% | 2543 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,805 psi | 77% | 2749 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,496 psi | 69% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,797 psi | 61% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,609 psi | 62% | 2661 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,212 psi | 50% | 2503 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 38,624 psi | 62% | 2723 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 43,424 psi | 70% | 2769 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,043 psi | 60% | 2641 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 38,058 psi | 61% | 2726 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 35,665 psi | 58% | 2743 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,966 psi | 52% | 2533 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 43,004 psi | 69% | 2815 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 48,370 psi | 78% | 2953 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,189 psi | 63% | 2723 fps | 97.9% |
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 112 powders for .25 Creedmoor loaded with the .257 | 104gr | Peregrine VLR-5. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,136 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 104.0 gr projectile in 0.257" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .25 Creedmoor with the .257 | 104gr | Peregrine VLR-5 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.