Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:115 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:1:10.0
Load data in caliber .25 Creedmoor with .257 | 115gr | Nosler Partition bullet and 96 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>> | 82% | 53,737 psi | 87% | 2736 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,811 psi | 90% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,925 psi | 87% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,969 psi | 89% | 2812 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,105 psi | 70% | 2710 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 55,999 psi | 90% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,043 psi | 90% | 2946 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 52,649 psi | 85% | 2835 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 53,751 psi | 87% | 2835 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,998 psi | 89% | 2835 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,086 psi | 90% | 2808 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,912 psi | 90% | 3009 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,838 psi | 87% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,447 psi | 88% | 2881 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,650 psi | 87% | 2949 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,868 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,857 psi | 66% | 2736 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2907 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,072 psi | 90% | 2904 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,491 psi | 88% | 2874 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,621 psi | 88% | 2848 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,388 psi | 86% | 2769 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,404 psi | 88% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,274 psi | 89% | 2887 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 55,042 psi | 89% | 2940 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 55,695 psi | 90% | 2904 fps | 97% |
| Hodgdon H4895 | <<locked>> | 84% | 53,229 psi | 86% | 2844 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,156 psi | 86% | 2871 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 52,779 psi | 85% | 2877 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,651 psi | 90% | 2976 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 57% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,476 psi | 88% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,447 psi | 86% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,098 psi | 86% | 2818 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,200 psi | 86% | 2799 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 54,984 psi | 89% | 2874 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,127 psi | 86% | 2828 fps | 97.6% |
| IMR 4831 | <<locked>> | 98% | 52,837 psi | 85% | 2881 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 55,854 psi | 90% | 2913 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,998 psi | 89% | 2835 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 52,330 psi | 84% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,593 psi | 90% | 2815 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,084 psi | 86% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,825 psi | 90% | 2871 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 53,200 psi | 86% | 2851 fps | 98% |
| Norma 201 | <<locked>> | 86% | 54,969 psi | 89% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,506 psi | 90% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,664 psi | 87% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,448 psi | 89% | 2920 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 45,818 psi | 74% | 2858 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 54,810 psi | 88% | 2930 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 54,085 psi | 87% | 2890 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,650 psi | 87% | 2927 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 55,245 psi | 89% | 2854 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,187 psi | 89% | 2877 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,912 psi | 90% | 2838 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,071 psi | 58% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,738 psi | 90% | 2871 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,708 psi | 88% | 2943 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,302 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,825 psi | 90% | 2969 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,042 psi | 89% | 2995 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,941 psi | 90% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,434 psi | 89% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,375 psi | 88% | 2867 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,621 psi | 88% | 2848 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,825 psi | 90% | 2871 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 52,330 psi | 84% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,084 psi | 86% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,200 psi | 86% | 2851 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 52,707 psi | 85% | 2877 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,737 psi | 87% | 2835 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,418 psi | 88% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,101 psi | 90% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,185 psi | 86% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,057 psi | 90% | 2822 fps | 98.1% |
| Somchem S335 | <<locked>> | 86% | 55,767 psi | 90% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,272 psi | 86% | 2822 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 54,824 psi | 88% | 2867 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,808 psi | 85% | 2930 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,936 psi | 79% | 2808 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 82% | 56,028 psi | 90% | 2730 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,185 psi | 86% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,332 psi | 89% | 2795 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 52,649 psi | 85% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 52,605 psi | 85% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,780 psi | 87% | 2874 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,434 psi | 89% | 2835 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,056 psi | 87% | 2805 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 52,794 psi | 85% | 2877 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,078 psi | 73% | 2812 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,824 psi | 87% | 2848 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,463 psi | 89% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,405 psi | 89% | 2946 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,622 psi | 59% | 2743 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,607 psi | 88% | 2867 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 50,314 psi | 81% | 2687 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,221 psi | 70% | 2618 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,517 psi | 81% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,034 psi | 73% | 2641 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 40,176 psi | 65% | 2651 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,857 psi | 66% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,476 psi | 56% | 2546 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 46,644 psi | 75% | 2730 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,465 psi | 64% | 2575 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,718 psi | 79% | 2736 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,211 psi | 79% | 2717 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,569 psi | 69% | 2766 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,363 psi | 63% | 2602 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,293 psi | 68% | 2667 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,722 psi | 56% | 2562 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,026 psi | 55% | 2572 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,023 psi | 48% | 2464 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,679 psi | 56% | 2644 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,687 psi | 74% | 2733 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,957 psi | 63% | 2605 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,339 psi | 73% | 2687 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,096 psi | 81% | 2717 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,776 psi | 77% | 2759 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,769 psi | 64% | 2608 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 42,221 psi | 68% | 2710 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 48,979 psi | 79% | 2789 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,079 psi | 76% | 2743 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,965 psi | 48% | 2405 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,960 psi | 69% | 2710 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 45,005 psi | 73% | 2789 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 43% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,860 psi | 72% | 2687 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,920 psi | 76% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,437 psi | 67% | 2608 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,947 psi | 71% | 2635 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 45,353 psi | 73% | 2710 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,961 psi | 71% | 2661 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 33,518 psi | 54% | 2507 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 43,337 psi | 70% | 2700 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,718 psi | 79% | 2736 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,788 psi | 74% | 2707 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,296 psi | 75% | 2664 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,524 psi | 67% | 2618 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,609 psi | 62% | 2559 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 41,713 psi | 67% | 2641 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,585 psi | 74% | 2680 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,963 psi | 74% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,655 psi | 67% | 2657 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 51,895 psi | 84% | 2864 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 42,888 psi | 69% | 2799 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,722 psi | 56% | 2546 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 41,321 psi | 67% | 2671 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 38,522 psi | 62% | 2641 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,428 psi | 78% | 2743 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,240 psi | 78% | 2766 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,214 psi | 84% | 2782 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 43% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,234 psi | 65% | 2592 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,614 psi | 72% | 2772 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,216 psi | 58% | 2641 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,272 psi | 55% | 2562 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,695 psi | 59% | 2628 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,617 psi | 80% | 2717 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,410 psi | 70% | 2635 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,840 psi | 59% | 2552 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 45,339 psi | 73% | 2687 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,609 psi | 62% | 2559 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,788 psi | 74% | 2707 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,524 psi | 67% | 2618 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,713 psi | 67% | 2641 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,681 psi | 61% | 2598 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,862 psi | 76% | 2720 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,962 psi | 73% | 2697 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,659 psi | 75% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,928 psi | 63% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,381 psi | 70% | 2612 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 46,441 psi | 75% | 2628 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,514 psi | 75% | 2713 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,550 psi | 61% | 2556 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,412 psi | 44% | 2388 fps | 96.3% |
| Somchem S385 | <<locked>> | 98% | 46,137 psi | 74% | 2759 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,518 psi | 85% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,007 psi | 76% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,844 psi | 69% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,584 psi | 70% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,781 psi | 58% | 2493 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 33,895 psi | 55% | 2493 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 48,573 psi | 78% | 2730 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,843 psi | 67% | 2608 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,679 psi | 58% | 2549 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 32,474 psi | 52% | 2539 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,502 psi | 51% | 2415 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 48,602 psi | 78% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,221 psi | 68% | 2710 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,384 psi | 46% | 2480 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,643 psi | 72% | 2703 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 115 powders for .25 Creedmoor loaded with the .257 | 115gr | Nosler Partition. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,009 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 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 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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 High Country, ADI AR 2213, Alliant Reloder-22 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.