Load Specifications
Load data in caliber .260 Ackley Improved with .264 | 125gr | Hammer HHT bullet and 99 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 Alliant Power Pro 2000-MR.
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% | 53,824 psi | 86% | 2684 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,651 psi | 89% | 2756 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,550 psi | 89% | 2749 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,737 psi | 86% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,230 psi | 89% | 2753 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 55,666 psi | 89% | 2799 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2881 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 56,188 psi | 90% | 2831 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 53,954 psi | 87% | 2782 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,129 psi | 88% | 2782 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,883 psi | 90% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,796 psi | 89% | 2949 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,708 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,404 psi | 87% | 2825 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,171 psi | 85% | 2884 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,143 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,956 psi | 61% | 2621 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,901 psi | 67% | 2766 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,028 psi | 90% | 2848 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 54,244 psi | 87% | 2818 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,404 psi | 87% | 2785 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,635 psi | 86% | 2717 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,650 psi | 88% | 2815 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,678 psi | 84% | 2854 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 56,028 psi | 90% | 2776 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,216 psi | 89% | 2828 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 54,346 psi | 87% | 2874 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 96% | 55,303 psi | 89% | 2835 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 53,171 psi | 85% | 2789 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2759 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,057 psi | 90% | 2874 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,259 psi | 89% | 2910 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 57% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,621 psi | 88% | 2792 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,214 psi | 85% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,185 psi | 85% | 2762 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,519 psi | 86% | 2743 fps | 97.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2808 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,953 psi | 85% | 2762 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,069 psi | 83% | 2815 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 55,782 psi | 89% | 2854 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,129 psi | 88% | 2782 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,492 psi | 89% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,115 psi | 90% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,985 psi | 90% | 2759 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 53,040 psi | 85% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,492 psi | 89% | 2808 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2841 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 55,056 psi | 88% | 2779 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,506 psi | 89% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,577 psi | 86% | 2812 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2854 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 54,041 psi | 87% | 2864 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 53,824 psi | 86% | 2835 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,982 psi | 85% | 2858 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 55,361 psi | 89% | 2799 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,143 psi | 88% | 2822 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,115 psi | 90% | 2782 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 58% | 1742 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,708 psi | 88% | 2762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,477 psi | 89% | 2808 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,389 psi | 87% | 2884 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,041 psi | 87% | 2923 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 2900 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2927 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 56,057 psi | 90% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,564 psi | 89% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,114 psi | 87% | 2808 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,404 psi | 87% | 2785 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,492 psi | 89% | 2808 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,115 psi | 90% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,040 psi | 85% | 2759 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2841 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,637 psi | 89% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,722 psi | 86% | 2776 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,404 psi | 87% | 2799 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,229 psi | 85% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,417 psi | 86% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,999 psi | 90% | 2759 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 56,405 psi | 90% | 2815 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,999 psi | 90% | 2717 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,592 psi | 86% | 2772 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,273 psi | 87% | 2805 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,718 psi | 78% | 2818 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 56,362 psi | 90% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,447 psi | 86% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,810 psi | 88% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,782 psi | 89% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,796 psi | 89% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,185 psi | 85% | 2808 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 55,608 psi | 89% | 2782 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,070 psi | 87% | 2753 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2867 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,930 psi | 66% | 2690 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,896 psi | 86% | 2795 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,666 psi | 89% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,737 psi | 88% | 2877 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,823 psi | 54% | 2608 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,520 psi | 87% | 2812 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% | 47,413 psi | 76% | 2592 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,098 psi | 84% | 2707 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,263 psi | 65% | 2523 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,021 psi | 75% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,472 psi | 78% | 2644 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,043 psi | 61% | 2516 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,881 psi | 54% | 2490 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 43,642 psi | 70% | 2621 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 37,173 psi | 60% | 2474 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,658 psi | 73% | 2631 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 45,948 psi | 74% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | 36.9 gr | 80% | 39,682 psi | 64% | 2651 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,840 psi | 59% | 2500 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,407 psi | 63% | 2559 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,563 psi | 55% | 2507 fps | 95.5% |
| Alliant Reloder-17 | 36.3 gr | 80% | 31,604 psi | 51% | 2457 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,718 psi | 48% | 2405 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,622 psi | 59% | 2641 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,946 psi | 69% | 2628 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 36,303 psi | 58% | 2503 fps | 98.4% |
| Bofors RP7 | <<locked>> | 92% | 48,109 psi | 77% | 2680 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,543 psi | 76% | 2621 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,541 psi | 71% | 2654 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,255 psi | 79% | 2799 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 52,388 psi | 84% | 2726 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,231 psi | 60% | 2503 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 92% | 44,788 psi | 72% | 2710 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 48,936 psi | 78% | 2733 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 44,005 psi | 71% | 2635 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,689 psi | 48% | 2352 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,103 psi | 64% | 2608 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 94% | 47,964 psi | 77% | 2785 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,279 psi | 68% | 2589 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 43,801 psi | 70% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,001 psi | 63% | 2510 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,440 psi | 71% | 2585 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 45,266 psi | 73% | 2654 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,019 psi | 71% | 2605 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 33,025 psi | 53% | 2451 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 40,350 psi | 65% | 2589 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 45,658 psi | 73% | 2631 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 51,982 psi | 83% | 2720 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,786 psi | 69% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,888 psi | 70% | 2562 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 38,957 psi | 62% | 2516 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 38,450 psi | 62% | 2503 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 44,005 psi | 71% | 2635 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,917 psi | 69% | 2582 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 43,236 psi | 69% | 2592 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,769 psi | 62% | 2546 fps | 98.1% |
| Norma 204 | <<locked>> | 98% | 51,517 psi | 83% | 2795 fps | 95% |
| Norma URP | <<locked>> | 86% | 34,330 psi | 55% | 2493 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,334 psi | 61% | 2562 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 40,814 psi | 65% | 2638 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,556 psi | 73% | 2635 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,136 psi | 72% | 2657 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,516 psi | 79% | 2684 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 43% | 1555 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,285 psi | 82% | 2713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,801 psi | 69% | 2592 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,452 psi | 66% | 2661 fps | 98.2% |
| ReloadSwiss RS 60 | 36.3 gr | 80% | 33,649 psi | 54% | 2526 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,114 psi | 58% | 2562 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,986 psi | 63% | 2628 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,818 psi | 75% | 2621 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,843 psi | 65% | 2533 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,301 psi | 55% | 2451 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 48,109 psi | 77% | 2680 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,450 psi | 62% | 2503 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,786 psi | 69% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,957 psi | 62% | 2516 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 44,005 psi | 71% | 2635 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,186 psi | 56% | 2497 fps | 97% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,063 psi | 71% | 2615 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,322 psi | 68% | 2595 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,425 psi | 71% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,883 psi | 59% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,323 psi | 69% | 2559 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 49,588 psi | 80% | 2713 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,903 psi | 70% | 2536 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,743 psi | 70% | 2612 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 35,128 psi | 56% | 2454 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 27,079 psi | 43% | 2336 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 50,169 psi | 80% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,686 psi | 72% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,335 psi | 65% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,930 psi | 66% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,417 psi | 54% | 2395 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 86% | 35,897 psi | 58% | 2493 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 45,818 psi | 73% | 2628 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,320 psi | 63% | 2513 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,288 psi | 57% | 2493 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 31,821 psi | 51% | 2484 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,704 psi | 48% | 2316 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 45,585 psi | 73% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 44,788 psi | 72% | 2710 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,718 psi | 48% | 2477 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,597 psi | 67% | 2595 fps | 99% |
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 115 powders for .260 Ackley Improved loaded with the .264 | 125gr | Hammer HHT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,949 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 (430 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.264" calls for a 1:8.0 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. Alliant Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .260 Ackley Improved with the .264 | 125gr | Hammer HHT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, 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.