Load Specifications
Load data in caliber .260 Ackley Improved with .264 | 124gr | Hammer Hunter bullet and 95 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% | 54,650 psi | 88% | 2733 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 52,823 psi | 85% | 2753 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,926 psi | 88% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,391 psi | 90% | 2815 fps | 97.5% |
| Accurate 4064 | <<locked>> | 90% | 53,026 psi | 85% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,837 psi | 85% | 2884 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,027 psi | 87% | 2838 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,129 psi | 88% | 2841 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 52,765 psi | 85% | 2785 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,650 psi | 86% | 2762 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,635 psi | 86% | 2956 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,824 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,535 psi | 89% | 2881 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,346 psi | 87% | 2943 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,622 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,537 psi | 62% | 2671 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,076 psi | 69% | 2831 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,577 psi | 86% | 2848 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 55,187 psi | 88% | 2871 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,550 psi | 89% | 2844 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,781 psi | 88% | 2772 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,724 psi | 89% | 2867 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,099 psi | 87% | 2913 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 52,953 psi | 85% | 2835 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 56,202 psi | 90% | 2940 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 94% | 53,447 psi | 86% | 2848 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 54,563 psi | 87% | 2848 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,459 psi | 81% | 2815 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,650 psi | 86% | 2877 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,229 psi | 85% | 2920 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 56% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,579 psi | 89% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,215 psi | 87% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,520 psi | 87% | 2822 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,607 psi | 88% | 2802 fps | 97.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2871 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,244 psi | 87% | 2825 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2874 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 53,461 psi | 86% | 2861 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 52,765 psi | 85% | 2785 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,214 psi | 85% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,563 psi | 86% | 2766 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 54,259 psi | 87% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,519 psi | 86% | 2818 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 54,070 psi | 87% | 2848 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 55,869 psi | 90% | 2828 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,026 psi | 85% | 2782 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,708 psi | 88% | 2867 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2923 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 55,143 psi | 88% | 2890 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2923 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 52,968 psi | 85% | 2802 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,231 psi | 90% | 2874 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,519 psi | 86% | 2785 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,665 psi | 57% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,912 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,127 psi | 85% | 2815 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,173 psi | 90% | 2949 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,622 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,924 psi | 85% | 2910 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2995 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 53,156 psi | 85% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,318 psi | 90% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,056 psi | 88% | 2861 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,550 psi | 89% | 2844 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,519 psi | 86% | 2818 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,214 psi | 85% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,259 psi | 87% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,070 psi | 87% | 2848 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,780 psi | 86% | 2877 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,013 psi | 88% | 2838 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,927 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,056 psi | 87% | 2720 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,375 psi | 87% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,650 psi | 86% | 2769 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 54,056 psi | 87% | 2818 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,417 psi | 86% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,621 psi | 88% | 2825 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,666 psi | 89% | 2864 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2877 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,882 psi | 86% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,346 psi | 87% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,014 psi | 90% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,548 psi | 86% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,461 psi | 86% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,752 psi | 88% | 2871 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 53,461 psi | 86% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,405 psi | 89% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,809 psi | 86% | 2877 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,163 psi | 68% | 2746 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,216 psi | 89% | 2851 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,098 psi | 85% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,202 psi | 90% | 2940 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,432 psi | 55% | 2671 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,579 psi | 89% | 2864 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% | 47,979 psi | 77% | 2638 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,306 psi | 65% | 2559 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,848 psi | 77% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,006 psi | 74% | 2644 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,145 psi | 61% | 2552 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,679 psi | 56% | 2543 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 44,353 psi | 71% | 2674 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,869 psi | 61% | 2530 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,485 psi | 75% | 2684 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,789 psi | 75% | 2667 fps | 100% |
| Alliant Power Pro 2000-MR | 38.8 gr | 80% | 40,437 psi | 65% | 2707 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,202 psi | 60% | 2546 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,016 psi | 64% | 2608 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,735 psi | 52% | 2497 fps | 95% |
| Alliant Reloder-17 | 38.2 gr | 80% | 32,126 psi | 52% | 2510 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,052 psi | 48% | 2454 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,838 psi | 56% | 2638 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,743 psi | 70% | 2680 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 36,724 psi | 59% | 2546 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 45,890 psi | 74% | 2680 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,414 psi | 78% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,368 psi | 73% | 2707 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,314 psi | 81% | 2854 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,681 psi | 60% | 2552 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 42,685 psi | 68% | 2707 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 49,792 psi | 80% | 2789 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 44,744 psi | 72% | 2687 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,065 psi | 45% | 2343 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,741 psi | 65% | 2657 fps | 99.4% |
| Hodgdon Superformance | 46.4 gr | 92% | 45,730 psi | 73% | 2785 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 42% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,062 psi | 69% | 2638 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 44,599 psi | 72% | 2680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,755 psi | 64% | 2562 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,206 psi | 68% | 2582 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 46,340 psi | 74% | 2710 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,293 psi | 68% | 2612 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 33,562 psi | 54% | 2500 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,031 psi | 66% | 2641 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,485 psi | 75% | 2684 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 43,337 psi | 69% | 2651 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,411 psi | 71% | 2612 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,320 psi | 63% | 2559 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,015 psi | 63% | 2556 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 41,916 psi | 67% | 2635 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,236 psi | 69% | 2625 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 43,714 psi | 70% | 2635 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,378 psi | 63% | 2598 fps | 98.5% |
| Norma URP | <<locked>> | 86% | 34,969 psi | 56% | 2543 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,102 psi | 63% | 2612 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 39,088 psi | 63% | 2641 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 46,586 psi | 75% | 2694 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,977 psi | 74% | 2710 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,357 psi | 81% | 2736 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,527 psi | 43% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,127 psi | 84% | 2762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,756 psi | 65% | 2592 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,293 psi | 68% | 2717 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,243 psi | 55% | 2579 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,360 psi | 55% | 2556 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,202 psi | 60% | 2628 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 47,152 psi | 76% | 2667 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,176 psi | 66% | 2579 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,505 psi | 55% | 2490 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 45,890 psi | 74% | 2680 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,015 psi | 63% | 2556 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,337 psi | 69% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,320 psi | 63% | 2559 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,916 psi | 67% | 2635 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,679 psi | 57% | 2543 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,730 psi | 72% | 2664 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,946 psi | 69% | 2644 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,715 psi | 72% | 2579 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,159 psi | 60% | 2448 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,077 psi | 71% | 2612 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 50,415 psi | 81% | 2766 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,280 psi | 71% | 2582 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,541 psi | 71% | 2664 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,404 psi | 57% | 2497 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 25,512 psi | 41% | 2320 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,531 psi | 81% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,107 psi | 72% | 2572 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,669 psi | 65% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,379 psi | 66% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,663 psi | 54% | 2434 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,200 psi | 55% | 2490 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,586 psi | 75% | 2680 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,842 psi | 64% | 2559 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,721 psi | 54% | 2493 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 32,314 psi | 52% | 2530 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,936 psi | 48% | 2362 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 46,311 psi | 74% | 2726 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,018 psi | 69% | 2713 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,095 psi | 48% | 2533 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,409 psi | 68% | 2648 fps | 99.3% |
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 95 powders for .260 Ackley Improved loaded with the .264 | 124gr | Hammer Hunter. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,995 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,995 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 95 of the 95 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 124.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 | 124gr | Hammer 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.