Load Specifications
Load data in caliber .25 Creedmoor with .257 | 100gr | Sierra MatchKing bullet and 94 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% | 55,637 psi | 90% | 2963 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,027 psi | 87% | 2986 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,621 psi | 86% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,854 psi | 90% | 3048 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 53,664 psi | 87% | 3025 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,359 psi | 86% | 3094 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 54,520 psi | 88% | 3054 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 55,724 psi | 90% | 3054 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,621 psi | 86% | 3009 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 54,172 psi | 87% | 2992 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,187 psi | 89% | 3120 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,012 psi | 87% | 3169 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,288 psi | 89% | 3074 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,158 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,057 psi | 90% | 3097 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,459 psi | 83% | 3094 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,591 psi | 85% | 3140 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,637 psi | 59% | 2799 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,404 psi | 88% | 3068 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 55,796 psi | 90% | 3091 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,390 psi | 89% | 2992 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,750 psi | 85% | 3035 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,621 psi | 88% | 3133 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 54,230 psi | 87% | 3009 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,201 psi | 89% | 3031 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,606 psi | 86% | 3045 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 98% | 52,678 psi | 85% | 3084 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 55,013 psi | 89% | 3068 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,529 psi | 77% | 2966 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,288 psi | 88% | 3097 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,070 psi | 57% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,069 psi | 86% | 3015 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 54,766 psi | 88% | 3058 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,056 psi | 89% | 3035 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,376 psi | 89% | 3009 fps | 96.6% |
| IMR 4198 | <<locked>> | 82% | 55,216 psi | 89% | 2927 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,969 psi | 89% | 3035 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,459 psi | 81% | 3025 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 53,882 psi | 87% | 3077 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 53,621 psi | 86% | 3009 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 53,795 psi | 87% | 2992 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,114 psi | 87% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,592 psi | 88% | 2986 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 54,839 psi | 88% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,867 psi | 87% | 3022 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 3058 fps | 96.9% |
| Norma 201 | <<locked>> | 88% | 53,505 psi | 86% | 3002 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 53,867 psi | 87% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,216 psi | 89% | 3084 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 52,504 psi | 85% | 3081 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 55,956 psi | 90% | 3114 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,343 psi | 83% | 3068 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 54,027 psi | 87% | 3018 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,693 psi | 87% | 3045 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,868 psi | 88% | 3009 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,520 psi | 57% | 1923 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,330 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,215 psi | 87% | 3025 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,663 psi | 85% | 3107 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,127 psi | 84% | 3143 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 3110 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,258 psi | 86% | 3140 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 86% | 54,331 psi | 88% | 2989 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,954 psi | 87% | 3002 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 55,637 psi | 90% | 3077 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,867 psi | 87% | 3022 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,114 psi | 87% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,839 psi | 88% | 3035 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 3058 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,186 psi | 87% | 3091 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,272 psi | 84% | 2992 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,069 psi | 86% | 3022 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,129 psi | 89% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,056 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,621 psi | 88% | 2972 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 54,998 psi | 89% | 3041 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,462 psi | 88% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,535 psi | 90% | 3045 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 52,750 psi | 85% | 3025 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,789 psi | 75% | 3025 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,824 psi | 88% | 2910 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,230 psi | 89% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,127 psi | 86% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,447 psi | 88% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,114 psi | 87% | 3005 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 3081 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 53,998 psi | 87% | 3005 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 56,072 psi | 90% | 3028 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 3081 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,523 psi | 64% | 2881 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,286 psi | 84% | 3005 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 53,795 psi | 87% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,098 psi | 86% | 3091 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,997 psi | 85% | 3035 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% | 46,064 psi | 74% | 2815 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,256 psi | 81% | 2927 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,783 psi | 63% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,498 psi | 73% | 2881 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,637 psi | 59% | 2710 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 37,449 psi | 60% | 2785 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 42,540 psi | 69% | 2831 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 36,042 psi | 58% | 2664 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,585 psi | 72% | 2844 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 44,280 psi | 71% | 2841 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,967 psi | 84% | 3064 fps | 99.6% |
| Alliant Power Pro 2000-MR | 38 gr | 80% | 38,450 psi | 62% | 2841 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,563 psi | 57% | 2687 fps | 96.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,677 psi | 83% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,305 psi | 62% | 2756 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,840 psi | 61% | 2802 fps | 95.2% |
| Alliant Reloder-17 | 39.3 gr | 84% | 35,099 psi | 57% | 2759 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,389 psi | 55% | 2736 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,611 psi | 67% | 2825 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 34,867 psi | 56% | 2684 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,238 psi | 75% | 2838 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,134 psi | 70% | 2861 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,485 psi | 77% | 3009 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 50,705 psi | 82% | 2953 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,764 psi | 83% | 2976 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,220 psi | 66% | 2808 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 96% | 49,327 psi | 80% | 3022 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 42,873 psi | 69% | 2844 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,372 psi | 52% | 2625 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,522 psi | 62% | 2799 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,078 psi | 42% | 1677 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,959 psi | 66% | 2785 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 42,279 psi | 68% | 2848 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,811 psi | 61% | 2703 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,849 psi | 79% | 2894 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,069 psi | 84% | 2881 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,486 psi | 78% | 2917 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 38,638 psi | 62% | 2795 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,204 psi | 63% | 2789 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 44,585 psi | 72% | 2844 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 50,444 psi | 81% | 2940 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,133 psi | 66% | 2805 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 42,699 psi | 69% | 2769 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 37,710 psi | 61% | 2710 fps | 97.9% |
| Lovex S065 | <<locked>> | 92% | 44,860 psi | 72% | 2858 fps | 95.7% |
| Lovex S070 | <<locked>> | 96% | 48,269 psi | 78% | 2940 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,611 psi | 67% | 2785 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 41,829 psi | 67% | 2799 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 37,666 psi | 61% | 2743 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 37,869 psi | 61% | 2789 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,101 psi | 60% | 2749 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 45,208 psi | 73% | 2949 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,237 psi | 71% | 2835 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,743 psi | 71% | 2861 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,196 psi | 78% | 2894 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,266 psi | 42% | 1716 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,038 psi | 81% | 2940 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,427 psi | 76% | 2907 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,697 psi | 64% | 2854 fps | 96.6% |
| ReloadSwiss RS 60 | 37.4 gr | 80% | 32,619 psi | 53% | 2703 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,103 psi | 65% | 2867 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 43,207 psi | 70% | 2936 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,527 psi | 73% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,595 psi | 64% | 2733 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,982 psi | 53% | 2628 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 44,860 psi | 72% | 2858 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,133 psi | 66% | 2805 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 37,710 psi | 61% | 2710 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 96% | 48,269 psi | 78% | 2940 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,910 psi | 55% | 2674 fps | 95% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,728 psi | 69% | 2812 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,872 psi | 66% | 2792 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,931 psi | 69% | 2743 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,563 psi | 57% | 2598 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,834 psi | 77% | 2861 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 48,138 psi | 78% | 2930 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 42,641 psi | 69% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,351 psi | 68% | 2812 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 33,924 psi | 55% | 2638 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 29,631 psi | 48% | 2608 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,515 psi | 78% | 2815 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,178 psi | 70% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,696 psi | 62% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,610 psi | 64% | 2730 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,256 psi | 52% | 2572 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 39,581 psi | 64% | 2792 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 44,309 psi | 71% | 2835 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,971 psi | 61% | 2707 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 39,030 psi | 63% | 2792 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 36,941 psi | 60% | 2822 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,793 psi | 53% | 2595 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 43,830 psi | 71% | 2881 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 49,327 psi | 80% | 3022 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,306 psi | 65% | 2795 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 109 powders for .25 Creedmoor loaded with the .257 | 100gr | Sierra MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,169 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,169 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:10.5 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 | 100gr | Sierra MatchKing 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.