Load Specifications
Load data in caliber .25 Creedmoor with .257 | 100gr | Peregrine VLR-4 bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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>> | 86% | 52,692 psi | 85% | 2920 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,621 psi | 88% | 2992 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,809 psi | 87% | 2982 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 52,982 psi | 85% | 3005 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 53,954 psi | 87% | 3031 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,067 psi | 81% | 3038 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 55,564 psi | 90% | 2917 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,014 psi | 90% | 2943 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,492 psi | 90% | 3068 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 53,026 psi | 86% | 3005 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,563 psi | 88% | 3018 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 54,926 psi | 89% | 3002 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 52,576 psi | 85% | 3074 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,361 psi | 89% | 3186 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,970 psi | 90% | 3084 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,854 psi | 90% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,461 psi | 86% | 3054 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,892 psi | 79% | 3041 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,505 psi | 86% | 3150 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,868 psi | 88% | 2907 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,622 psi | 90% | 3081 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 52,968 psi | 85% | 3045 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,359 psi | 86% | 2956 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,650 psi | 87% | 3048 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,695 psi | 90% | 3150 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 55,564 psi | 90% | 3025 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 52,997 psi | 85% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,230 psi | 87% | 3054 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 3094 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 90% | 56,028 psi | 90% | 3077 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,875 psi | 72% | 2913 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,434 psi | 89% | 3114 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,621 psi | 56% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,143 psi | 87% | 3031 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 55,637 psi | 90% | 3068 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,883 psi | 90% | 3041 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,171 psi | 86% | 2966 fps | 96% |
| IMR 4198 | <<locked>> | 82% | 53,272 psi | 86% | 2897 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,999 psi | 90% | 3045 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,587 psi | 77% | 2976 fps | 97.8% |
| IMR 4895 | <<locked>> | 92% | 54,839 psi | 88% | 3087 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 54,563 psi | 88% | 3018 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 54,868 psi | 88% | 3009 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,824 psi | 88% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,332 psi | 89% | 2992 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 55,332 psi | 89% | 3038 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 3028 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,054 psi | 84% | 3005 fps | 96.1% |
| Norma 201 | <<locked>> | 90% | 54,230 psi | 87% | 3012 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 54,766 psi | 88% | 3018 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,825 psi | 90% | 3091 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 49,676 psi | 80% | 3028 fps | 98% |
| Ramshot Big Game | <<locked>> | 92% | 53,156 psi | 86% | 3064 fps | 99.3% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,878 psi | 79% | 3015 fps | 96.1% |
| Ramshot TAC | <<locked>> | 88% | 55,201 psi | 89% | 3031 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,781 psi | 88% | 3058 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,014 psi | 90% | 3022 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,969 psi | 56% | 1906 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,230 psi | 87% | 3005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,056 psi | 89% | 3038 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,592 psi | 86% | 3120 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,403 psi | 86% | 3159 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,603 psi | 80% | 3054 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,517 psi | 81% | 3084 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 88% | 54,723 psi | 88% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,317 psi | 88% | 3002 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 52,823 psi | 85% | 3031 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,621 psi | 88% | 3028 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,824 psi | 88% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,332 psi | 89% | 3038 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,054 psi | 84% | 3005 fps | 96.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,201 psi | 87% | 2972 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,969 psi | 89% | 3100 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,679 psi | 87% | 2956 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,243 psi | 86% | 3002 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,085 psi | 87% | 3035 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 52,924 psi | 85% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,912 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2979 fps | 96.4% |
| Somchem S321 | <<locked>> | 86% | 56,028 psi | 90% | 3054 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,376 psi | 89% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 52,765 psi | 85% | 2995 fps | 99.3% |
| Somchem S355 | <<locked>> | 96% | 53,258 psi | 86% | 3031 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,019 psi | 71% | 2969 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 86% | 55,709 psi | 90% | 2923 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,069 psi | 86% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,882 psi | 87% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,100 psi | 89% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,897 psi | 89% | 3015 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,489 psi | 85% | 3035 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 88% | 55,506 psi | 90% | 3025 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,287 psi | 86% | 2986 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,271 psi | 83% | 3031 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,534 psi | 86% | 3018 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 54,781 psi | 88% | 3071 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 3094 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,650 psi | 87% | 3041 fps | 99.7% |
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% | 43,497 psi | 70% | 2772 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,703 psi | 77% | 2884 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,766 psi | 58% | 2667 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,670 psi | 69% | 2828 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 33,837 psi | 55% | 2648 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 40,016 psi | 65% | 2844 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 52,402 psi | 85% | 2867 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,794 psi | 85% | 2894 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,335 psi | 65% | 2782 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 36,506 psi | 59% | 2674 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,438 psi | 68% | 2802 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 41,669 psi | 67% | 2799 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,414 psi | 80% | 3018 fps | 99.3% |
| Alliant Power Pro 2000-MR | 38 gr | 82% | 39,131 psi | 63% | 2854 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,373 psi | 54% | 2635 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,414 psi | 80% | 2881 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,129 psi | 58% | 2703 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,971 psi | 61% | 2802 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,331 psi | 57% | 2766 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,532 psi | 83% | 2858 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,291 psi | 63% | 2772 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 32,518 psi | 52% | 2625 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,179 psi | 71% | 2795 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,596 psi | 65% | 2808 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,904 psi | 72% | 2956 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 48,399 psi | 78% | 2913 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,211 psi | 79% | 2933 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,510 psi | 67% | 2815 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 98% | 49,995 psi | 81% | 3031 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 40,640 psi | 66% | 2795 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,766 psi | 56% | 2690 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,434 psi | 59% | 2749 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 41% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,914 psi | 63% | 2740 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 39,740 psi | 64% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,723 psi | 58% | 2651 fps | 95.2% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,777 psi | 80% | 2907 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 50,096 psi | 81% | 2851 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 49,516 psi | 80% | 2933 fps | 95% |
| IMR 4831 | <<locked>> | 94% | 38,827 psi | 63% | 2799 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 36,970 psi | 60% | 2736 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 42,438 psi | 68% | 2802 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 47,558 psi | 77% | 2890 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 38,682 psi | 62% | 2756 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 40,698 psi | 66% | 2723 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 35,462 psi | 57% | 2657 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 45,397 psi | 73% | 2864 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 48,675 psi | 79% | 2946 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 39,204 psi | 63% | 2733 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 39,523 psi | 64% | 2749 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,505 psi | 57% | 2690 fps | 95.7% |
| Norma URP | <<locked>> | 94% | 40,582 psi | 65% | 2851 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 34,853 psi | 56% | 2694 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 98% | 45,759 psi | 74% | 2956 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 42,351 psi | 68% | 2792 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,394 psi | 67% | 2812 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,876 psi | 74% | 2848 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,831 psi | 42% | 1703 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,427 psi | 76% | 2890 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,254 psi | 78% | 2920 fps | 95.6% |
| ReloadSwiss RS 52 | 35.9 gr | 80% | 37,420 psi | 60% | 2802 fps | 95.7% |
| ReloadSwiss RS 60 | 36.5 gr | 80% | 30,806 psi | 50% | 2648 fps | 96.6% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,176 psi | 65% | 2867 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,787 psi | 71% | 2943 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 42,815 psi | 69% | 2789 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 37,260 psi | 60% | 2680 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 32,706 psi | 53% | 2625 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 45,397 psi | 73% | 2864 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,682 psi | 62% | 2756 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 35,462 psi | 57% | 2657 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 98% | 48,675 psi | 79% | 2946 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,270 psi | 81% | 2910 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,200 psi | 55% | 2684 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,459 psi | 81% | 2907 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,248 psi | 65% | 2756 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,827 psi | 63% | 2746 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,046 psi | 66% | 2703 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,779 psi | 54% | 2556 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,880 psi | 84% | 2923 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 45,571 psi | 74% | 2881 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,408 psi | 65% | 2703 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 40,030 psi | 65% | 2759 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 33,997 psi | 55% | 2641 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 29,515 psi | 48% | 2605 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 46,557 psi | 75% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,292 psi | 67% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,521 psi | 59% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,405 psi | 60% | 2680 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 30,153 psi | 49% | 2520 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 40,001 psi | 65% | 2799 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 42,134 psi | 68% | 2792 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 35,897 psi | 58% | 2664 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 92% | 39,030 psi | 63% | 2792 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,083 psi | 53% | 2602 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 41,582 psi | 67% | 2838 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 49,995 psi | 81% | 3031 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,913 psi | 61% | 2743 fps | 97.1% |
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 110 powders for .25 Creedmoor loaded with the .257 | 100gr | Peregrine VLR-4. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,186 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .25 Creedmoor with the .257 | 100gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H4350 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.