Load Specifications
Load data in caliber .260 Ackley Improved with .264 | 120gr | Sierra Pro-Hunter bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
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>> | 84% | 56,420 psi | 90% | 2802 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,303 psi | 89% | 2828 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,374 psi | 86% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,244 psi | 87% | 2825 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,134 psi | 68% | 2713 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 55,216 psi | 89% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,187 psi | 88% | 2959 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,317 psi | 89% | 2904 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,214 psi | 85% | 2854 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,418 psi | 87% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,376 psi | 89% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,274 psi | 89% | 3028 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,084 psi | 85% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,751 psi | 86% | 2900 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,159 psi | 90% | 3015 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,983 psi | 87% | 2999 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,248 psi | 65% | 2746 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,281 psi | 73% | 2917 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,230 psi | 89% | 2920 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 53,780 psi | 86% | 2894 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,867 psi | 86% | 2861 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,086 psi | 90% | 2838 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,911 psi | 86% | 2887 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,651 psi | 89% | 2982 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,824 psi | 88% | 2907 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 54,143 psi | 87% | 2953 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 94% | 54,926 psi | 88% | 2917 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 55,927 psi | 90% | 2913 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,460 psi | 84% | 2890 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,463 psi | 89% | 2949 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,969 psi | 88% | 2995 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 57% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,780 psi | 86% | 2867 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,231 psi | 90% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,072 psi | 90% | 2890 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,912 psi | 90% | 2867 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 53,940 psi | 86% | 2884 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,782 psi | 89% | 2894 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2949 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 55,129 psi | 88% | 2930 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,418 psi | 87% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,448 psi | 89% | 2884 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,781 psi | 88% | 2831 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,970 psi | 90% | 2887 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,230 psi | 89% | 2887 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 56,101 psi | 90% | 2923 fps | 98.2% |
| Norma 201 | <<locked>> | 86% | 54,375 psi | 87% | 2854 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,882 psi | 88% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,275 psi | 90% | 2936 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,723 psi | 88% | 2936 fps | 96% |
| Norma URP | <<locked>> | 98% | 54,099 psi | 87% | 2946 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 53,403 psi | 86% | 2910 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 52,852 psi | 85% | 2940 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 54,650 psi | 88% | 2874 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,317 psi | 87% | 2890 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,347 psi | 89% | 2858 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,114 psi | 58% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,795 psi | 88% | 2884 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,244 psi | 87% | 2966 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,664 psi | 86% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,752 psi | 88% | 2982 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,288 psi | 87% | 3009 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,143 psi | 88% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,795 psi | 88% | 2851 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,664 psi | 86% | 2884 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,867 psi | 86% | 2861 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,230 psi | 89% | 2887 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,448 psi | 89% | 2884 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,970 psi | 90% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,101 psi | 90% | 2923 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,419 psi | 89% | 2946 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,185 psi | 85% | 2851 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,056 psi | 87% | 2877 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,521 psi | 89% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,883 psi | 90% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,608 psi | 89% | 2844 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 55,622 psi | 89% | 2887 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,230 psi | 89% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,318 psi | 90% | 2897 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,867 psi | 86% | 2881 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2949 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,588 psi | 78% | 2828 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 55,535 psi | 89% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,796 psi | 89% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,418 psi | 87% | 2812 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,158 psi | 88% | 2828 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,259 psi | 89% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,229 psi | 85% | 2894 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 54,795 psi | 88% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,519 psi | 86% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,680 psi | 89% | 2949 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,324 psi | 71% | 2828 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,272 psi | 85% | 2867 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,129 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,505 psi | 87% | 2959 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,158 psi | 58% | 2753 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,606 psi | 86% | 2881 fps | 100% |
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% | 49,922 psi | 80% | 2710 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,627 psi | 68% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,821 psi | 80% | 2792 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,500 psi | 76% | 2713 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 39,436 psi | 63% | 2661 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,292 psi | 65% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,953 psi | 54% | 2559 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,890 psi | 74% | 2746 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,044 psi | 63% | 2592 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,964 psi | 77% | 2753 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,646 psi | 78% | 2736 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,959 psi | 67% | 2782 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,783 psi | 62% | 2615 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,597 psi | 67% | 2680 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,243 psi | 55% | 2572 fps | 95.4% |
| Alliant Reloder-17 | 39.6 gr | 80% | 33,620 psi | 54% | 2585 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,602 psi | 47% | 2470 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,463 psi | 58% | 2713 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,281 psi | 73% | 2753 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 38,464 psi | 62% | 2618 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 47,384 psi | 76% | 2749 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,530 psi | 79% | 2736 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,123 psi | 76% | 2779 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,996 psi | 83% | 2927 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,204 psi | 63% | 2621 fps | 96.5% |
| Hodgdon H414 | 43.5 gr | 90% | 44,367 psi | 71% | 2779 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 48,385 psi | 78% | 2805 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,311 psi | 74% | 2756 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,472 psi | 47% | 2415 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,453 psi | 68% | 2730 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 92% | 47,616 psi | 76% | 2864 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,483 psi | 71% | 2707 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,050 psi | 74% | 2746 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,002 psi | 66% | 2628 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,540 psi | 70% | 2648 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 44,788 psi | 72% | 2723 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,700 psi | 70% | 2680 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 32,866 psi | 53% | 2513 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,612 psi | 68% | 2710 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,964 psi | 77% | 2753 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,397 psi | 73% | 2726 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,847 psi | 74% | 2680 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,017 psi | 66% | 2635 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,058 psi | 61% | 2569 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 43,801 psi | 70% | 2710 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 45,020 psi | 72% | 2697 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,368 psi | 73% | 2703 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,988 psi | 66% | 2671 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 51,010 psi | 82% | 2874 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,330 psi | 55% | 2562 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,683 psi | 65% | 2684 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 40,669 psi | 65% | 2710 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,051 psi | 77% | 2762 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,543 psi | 76% | 2779 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,924 psi | 83% | 2805 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 43% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,351 psi | 68% | 2661 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,859 psi | 70% | 2785 fps | 98.7% |
| ReloadSwiss RS 60 | 39.6 gr | 80% | 35,752 psi | 57% | 2654 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,158 psi | 58% | 2631 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,653 psi | 62% | 2697 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 48,892 psi | 78% | 2736 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,975 psi | 69% | 2651 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,245 psi | 58% | 2562 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 47,384 psi | 76% | 2749 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,058 psi | 61% | 2569 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,397 psi | 73% | 2726 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,017 psi | 66% | 2635 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,801 psi | 70% | 2710 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,072 psi | 59% | 2612 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,441 psi | 74% | 2736 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,280 psi | 71% | 2710 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,383 psi | 74% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,696 psi | 62% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,801 psi | 69% | 2625 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 52,112 psi | 84% | 2835 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,948 psi | 74% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,108 psi | 74% | 2733 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 37,057 psi | 59% | 2569 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 26,934 psi | 43% | 2395 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 45,324 psi | 73% | 2769 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 52,257 psi | 84% | 2707 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,746 psi | 75% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,525 psi | 68% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,931 psi | 69% | 2638 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,244 psi | 57% | 2507 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 35,766 psi | 57% | 2562 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,080 psi | 77% | 2749 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,292 psi | 66% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,346 psi | 57% | 2566 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 31,879 psi | 51% | 2549 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,241 psi | 50% | 2428 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 48,066 psi | 77% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,715 psi | 72% | 2785 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,834 psi | 48% | 2552 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,106 psi | 71% | 2720 fps | 99.4% |
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 97 powders for .260 Ackley Improved loaded with the .264 | 120gr | Sierra Pro-Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,028 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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 Reloder-17, ReloadSwiss RS 60, Hodgdon H414 rank at the top here: for .260 Ackley Improved with the .264 | 120gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.