Load Specifications
Load data in caliber .260 Ackley Improved with .264 | 120gr | Lapua ScenarL 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 Power Pro 2000-MR, Hodgdon Superformance 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>> | 84% | 54,491 psi | 87% | 2766 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,347 psi | 90% | 2838 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,055 psi | 85% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,708 psi | 88% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,057 psi | 90% | 2838 fps | 97% |
| Accurate 4064 | <<locked>> | 90% | 53,084 psi | 85% | 2835 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2966 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 53,722 psi | 86% | 2867 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 54,723 psi | 88% | 2864 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,173 psi | 90% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,258 psi | 85% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,055 psi | 85% | 2979 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,462 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,158 psi | 88% | 2907 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,809 psi | 86% | 2966 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,071 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,450 psi | 62% | 2697 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,902 psi | 69% | 2854 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,156 psi | 85% | 2874 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 55,317 psi | 89% | 2907 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,259 psi | 89% | 2867 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,476 psi | 87% | 2802 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,376 psi | 89% | 2897 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,577 psi | 86% | 2940 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 92% | 56,130 psi | 90% | 2913 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 55,622 psi | 89% | 2966 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 56,405 psi | 90% | 2927 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 54,230 psi | 87% | 2877 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,372 psi | 81% | 2848 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,548 psi | 86% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,779 psi | 85% | 2940 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 57% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,143 psi | 88% | 2874 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,201 psi | 87% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,157 psi | 87% | 2848 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,273 psi | 87% | 2825 fps | 97.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,477 psi | 89% | 2894 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,853 psi | 86% | 2848 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2900 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 53,156 psi | 85% | 2887 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 56,173 psi | 90% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,374 psi | 86% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,272 psi | 85% | 2795 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 54,012 psi | 87% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,243 psi | 85% | 2844 fps | 98.4% |
| Lovex S070 | <<locked>> | 98% | 53,838 psi | 86% | 2874 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 55,709 psi | 89% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,188 psi | 90% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,360 psi | 87% | 2894 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 56,159 psi | 90% | 2943 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2953 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 55,042 psi | 88% | 2923 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2946 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 56,318 psi | 90% | 2887 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,811 psi | 89% | 2904 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,577 psi | 86% | 2818 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 58% | 1798 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,564 psi | 89% | 2848 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 52,837 psi | 85% | 2838 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,637 psi | 89% | 2976 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,071 psi | 88% | 3009 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,956 psi | 90% | 2989 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,869 psi | 90% | 3018 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 53,650 psi | 86% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,173 psi | 90% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,766 psi | 88% | 2890 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,259 psi | 89% | 2867 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,243 psi | 85% | 2844 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,374 psi | 86% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,012 psi | 87% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,838 psi | 86% | 2874 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,316 psi | 85% | 2904 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,766 psi | 88% | 2861 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,492 psi | 89% | 2887 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,766 psi | 86% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,969 psi | 87% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,374 psi | 86% | 2792 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 53,751 psi | 86% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,272 psi | 85% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,244 psi | 87% | 2854 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 55,347 psi | 89% | 2890 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,690 psi | 80% | 2904 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,621 psi | 86% | 2717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,012 psi | 87% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,057 psi | 90% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,243 psi | 85% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,113 psi | 85% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,230 psi | 87% | 2894 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 53,142 psi | 85% | 2815 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,071 psi | 88% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,374 psi | 86% | 2904 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,974 psi | 67% | 2776 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,737 psi | 88% | 2877 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 52,736 psi | 85% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,622 psi | 89% | 2966 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,505 psi | 55% | 2687 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,550 psi | 89% | 2897 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% | 48,312 psi | 77% | 2677 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,924 psi | 85% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,017 psi | 66% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,805 psi | 77% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,182 psi | 79% | 2726 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,769 psi | 62% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,795 psi | 56% | 2569 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,237 psi | 71% | 2700 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 37,797 psi | 61% | 2552 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,267 psi | 74% | 2710 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 46,876 psi | 75% | 2703 fps | 100% |
| Alliant Power Pro 2000-MR | 38.7 gr | 80% | 40,234 psi | 65% | 2730 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,463 psi | 60% | 2579 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,001 psi | 64% | 2635 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,143 psi | 56% | 2582 fps | 95.5% |
| Alliant Reloder-17 | 38.1 gr | 80% | 32,169 psi | 52% | 2536 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,197 psi | 48% | 2477 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,405 psi | 60% | 2723 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,555 psi | 70% | 2707 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 36,854 psi | 59% | 2575 fps | 98.4% |
| Bofors RP7 | <<locked>> | 92% | 48,733 psi | 78% | 2759 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,196 psi | 77% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,237 psi | 73% | 2736 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,893 psi | 80% | 2881 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 80% | 37,710 psi | 60% | 2575 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 92% | 45,556 psi | 73% | 2792 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 49,763 psi | 80% | 2815 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 44,657 psi | 72% | 2713 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,110 psi | 48% | 2425 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,872 psi | 66% | 2687 fps | 99.1% |
| Hodgdon Superformance | 47.3 gr | 94% | 48,791 psi | 78% | 2871 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 42% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,888 psi | 69% | 2667 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 44,338 psi | 71% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,682 psi | 64% | 2589 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,802 psi | 72% | 2661 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 46,050 psi | 74% | 2733 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,817 psi | 72% | 2690 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 33,591 psi | 54% | 2523 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 40,959 psi | 66% | 2667 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 46,267 psi | 74% | 2710 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 43,656 psi | 70% | 2687 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,556 psi | 71% | 2644 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 39,682 psi | 64% | 2595 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,073 psi | 63% | 2582 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 44,614 psi | 72% | 2713 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 43,627 psi | 70% | 2661 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 43,932 psi | 70% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,363 psi | 63% | 2625 fps | 98.1% |
| Norma 204 | <<locked>> | 98% | 52,634 psi | 84% | 2884 fps | 95.2% |
| Norma URP | <<locked>> | 86% | 34,940 psi | 56% | 2566 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 38,943 psi | 62% | 2638 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 41,800 psi | 67% | 2723 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,412 psi | 74% | 2720 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,730 psi | 73% | 2736 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,125 psi | 80% | 2762 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 43% | 1608 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,214 psi | 84% | 2799 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,613 psi | 70% | 2674 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,003 psi | 67% | 2740 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,258 psi | 55% | 2605 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,912 psi | 59% | 2641 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,842 psi | 64% | 2713 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 47,340 psi | 76% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,278 psi | 66% | 2608 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,911 psi | 56% | 2523 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 48,733 psi | 78% | 2759 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,073 psi | 63% | 2582 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,656 psi | 70% | 2687 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,682 psi | 64% | 2595 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 44,614 psi | 72% | 2713 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,636 psi | 57% | 2569 fps | 97% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,672 psi | 72% | 2690 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,786 psi | 69% | 2671 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,933 psi | 72% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,376 psi | 60% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,961 psi | 70% | 2635 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 50,183 psi | 80% | 2792 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,599 psi | 72% | 2615 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,324 psi | 71% | 2690 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 35,766 psi | 57% | 2533 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 27,644 psi | 44% | 2408 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 50,691 psi | 81% | 2674 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,252 psi | 73% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,915 psi | 66% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,582 psi | 67% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,997 psi | 55% | 2467 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 84% | 34,447 psi | 55% | 2520 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 46,383 psi | 74% | 2707 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,813 psi | 64% | 2589 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 36,013 psi | 58% | 2572 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 92% | 32,416 psi | 52% | 2556 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,052 psi | 48% | 2385 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 46,050 psi | 74% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 45,556 psi | 73% | 2792 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,298 psi | 49% | 2552 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,279 psi | 68% | 2674 fps | 99.1% |
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 97 powders for .260 Ackley Improved loaded with the .264 | 120gr | Lapua ScenarL. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,018 fps. Accurate 4350 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 55–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .260 Ackley Improved with the .264 | 120gr | Lapua ScenarL 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.