Load Specifications
Bullet:.257 | 107gr | Hammer HBC
Bullet Manufacturer:Hammer
Bullet Weight:107 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.25 Creedmoor load data
Case Length (l3):1.92"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:51.5 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,001 psi
Recommended Twist Rate:1:7.5
Load data in caliber .25 Creedmoor with .257 | 107gr | Hammer HBC bullet and 99 powders. The key underlying parameters are shown in the table above.
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% | 54,694 psi | 88% | 2831 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,069 psi | 86% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 52,721 psi | 85% | 2848 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,955 psi | 89% | 2917 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 55,941 psi | 90% | 2940 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2953 fps | 98.7% |
| ADI AR 2206H | <<locked>> | 88% | 53,417 psi | 86% | 2920 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 54,563 psi | 88% | 2917 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,941 psi | 90% | 2927 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,229 psi | 86% | 2861 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,549 psi | 88% | 2986 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 52,881 psi | 85% | 3031 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,186 psi | 87% | 2943 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,099 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,882 psi | 89% | 2963 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,546 psi | 82% | 2966 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,882 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,694 psi | 58% | 2674 fps | 96.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,057 psi | 90% | 2812 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,200 psi | 86% | 2933 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 54,897 psi | 89% | 2959 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,390 psi | 89% | 2920 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,795 psi | 88% | 2864 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,245 psi | 89% | 2956 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,330 psi | 86% | 2999 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 53,214 psi | 86% | 2874 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,418 psi | 88% | 2900 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,057 psi | 90% | 2969 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,969 psi | 89% | 3005 fps | 97% |
| Hodgdon H4895 | <<locked>> | 88% | 53,925 psi | 87% | 2933 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,557 psi | 75% | 2838 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 52,910 psi | 85% | 2959 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 57% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,622 psi | 90% | 2940 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 53,621 psi | 86% | 2920 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,099 psi | 87% | 2904 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,259 psi | 88% | 2877 fps | 96.6% |
| IMR 4198 | <<locked>> | 82% | 54,186 psi | 87% | 2792 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,853 psi | 87% | 2900 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2897 fps | 98.5% |
| IMR 4895 | <<locked>> | 90% | 52,953 psi | 85% | 2943 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 55,941 psi | 90% | 2927 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 52,605 psi | 85% | 2858 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,171 psi | 86% | 2904 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,737 psi | 87% | 2854 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 53,824 psi | 87% | 2904 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2940 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,664 psi | 87% | 2923 fps | 96.8% |
| Norma 201 | <<locked>> | 90% | 55,883 psi | 90% | 2923 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,011 psi | 86% | 2877 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,041 psi | 87% | 2949 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 51,227 psi | 83% | 2946 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 54,592 psi | 88% | 2976 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2936 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 53,069 psi | 86% | 2887 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,620 psi | 85% | 2910 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,664 psi | 87% | 2874 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 57% | 1831 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,898 psi | 90% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 52,765 psi | 85% | 2890 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,129 psi | 89% | 3031 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,578 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,285 psi | 83% | 2976 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2995 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 86% | 53,345 psi | 86% | 2854 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,999 psi | 90% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,317 psi | 88% | 2943 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 55,390 psi | 89% | 2920 fps | 96.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2940 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,171 psi | 86% | 2904 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,824 psi | 87% | 2904 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,664 psi | 87% | 2923 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,535 psi | 90% | 2881 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 52,678 psi | 85% | 2953 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,071 psi | 89% | 2858 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,853 psi | 88% | 2920 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,463 psi | 89% | 2946 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,346 psi | 88% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,027 psi | 87% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,432 psi | 86% | 2844 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 53,722 psi | 87% | 2907 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,621 psi | 86% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,317 psi | 88% | 2910 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 54,897 psi | 89% | 2943 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,600 psi | 74% | 2890 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 84% | 54,041 psi | 87% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,491 psi | 88% | 2805 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,419 psi | 89% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,432 psi | 86% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 52,866 psi | 85% | 2874 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,650 psi | 87% | 2943 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 53,214 psi | 86% | 2874 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,781 psi | 88% | 2897 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,707 psi | 85% | 2946 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,348 psi | 62% | 2753 fps | 96.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2930 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 52,823 psi | 85% | 2923 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 3015 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,230 psi | 89% | 2953 fps | 99.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 45,368 psi | 73% | 2690 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,516 psi | 80% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,884 psi | 61% | 2605 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,469 psi | 72% | 2753 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 35,824 psi | 58% | 2592 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 36,550 psi | 59% | 2664 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 41,597 psi | 67% | 2703 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 35,607 psi | 57% | 2552 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,613 psi | 70% | 2717 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 43,236 psi | 70% | 2713 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,807 psi | 82% | 2923 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,681 psi | 61% | 2717 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,867 psi | 56% | 2572 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,821 psi | 82% | 2785 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,376 psi | 60% | 2631 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,014 psi | 60% | 2677 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 82% | 32,039 psi | 52% | 2575 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,634 psi | 54% | 2618 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,910 psi | 85% | 2769 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,857 psi | 66% | 2707 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 34,316 psi | 55% | 2569 fps | 97% |
| Bofors RP7 | <<locked>> | 96% | 51,706 psi | 83% | 2861 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,498 psi | 73% | 2710 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,235 psi | 68% | 2736 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,311 psi | 75% | 2874 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 49,951 psi | 81% | 2825 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,792 psi | 82% | 2848 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 40,103 psi | 65% | 2680 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 96% | 48,167 psi | 78% | 2890 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 41,930 psi | 68% | 2717 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,937 psi | 52% | 2516 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,826 psi | 61% | 2680 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 42% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,321 psi | 65% | 2667 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 41,278 psi | 67% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,304 psi | 60% | 2585 fps | 96.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,167 psi | 78% | 2772 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 51,271 psi | 83% | 2749 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,805 psi | 77% | 2795 fps | 95.1% |
| IMR 4831 | <<locked>> | 92% | 37,869 psi | 61% | 2677 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 38,276 psi | 62% | 2664 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 43,613 psi | 70% | 2717 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 49,139 psi | 79% | 2805 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,292 psi | 65% | 2684 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 41,930 psi | 68% | 2644 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 36,956 psi | 60% | 2592 fps | 98% |
| Lovex S065 | <<locked>> | 90% | 41,481 psi | 67% | 2684 fps | 95.1% |
| Lovex S070 | <<locked>> | 96% | 47,152 psi | 76% | 2812 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 40,814 psi | 66% | 2661 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 41,046 psi | 66% | 2674 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 36,782 psi | 59% | 2618 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 37,057 psi | 60% | 2667 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 36,303 psi | 59% | 2628 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 44,179 psi | 71% | 2822 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 43,540 psi | 70% | 2713 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,888 psi | 69% | 2736 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,384 psi | 76% | 2769 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,324 psi | 42% | 1634 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,081 psi | 79% | 2808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 46,427 psi | 75% | 2779 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,885 psi | 63% | 2730 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,111 psi | 52% | 2592 fps | 97.8% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,856 psi | 63% | 2736 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,351 psi | 68% | 2812 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 44,846 psi | 72% | 2713 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,769 psi | 63% | 2608 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 32,314 psi | 52% | 2513 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 96% | 51,706 psi | 83% | 2861 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,481 psi | 67% | 2684 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,292 psi | 65% | 2684 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 36,956 psi | 60% | 2592 fps | 98% |
| Shooters World SW4350 | <<locked>> | 96% | 47,152 psi | 76% | 2812 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,851 psi | 84% | 2825 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,228 psi | 54% | 2559 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,706 psi | 83% | 2808 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,611 psi | 67% | 2684 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,161 psi | 65% | 2671 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,264 psi | 68% | 2621 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,954 psi | 56% | 2480 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 50,067 psi | 81% | 2789 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 47,253 psi | 76% | 2802 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 41,887 psi | 68% | 2625 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,611 psi | 67% | 2690 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 33,199 psi | 54% | 2520 fps | 96% |
| Somchem S365 | <<locked>> | 86% | 29,008 psi | 47% | 2497 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 47,790 psi | 77% | 2690 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,482 psi | 69% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,014 psi | 61% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,928 psi | 63% | 2608 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 31,647 psi | 51% | 2461 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 38,812 psi | 63% | 2671 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 43,729 psi | 71% | 2713 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 37,217 psi | 60% | 2589 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 38,087 psi | 61% | 2674 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 35,940 psi | 58% | 2700 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,010 psi | 52% | 2480 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 43,134 psi | 70% | 2759 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 48,515 psi | 78% | 2897 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,407 psi | 64% | 2674 fps | 98% |
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 | 107gr | Hammer HBC. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,064 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 52–90 %, leaving at least 10 % headroom. The 107.0 gr projectile in 0.257" calls for a 1:7.5 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. 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.