Load Specifications
Load data in caliber .260 Ackley Improved with .263 | 120gr | Rhino Solid Shank 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% | 56,231 psi | 90% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,100 psi | 88% | 2825 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,852 psi | 85% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,780 psi | 86% | 2815 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,032 psi | 67% | 2710 fps | 96% |
| Accurate 4064 | <<locked>> | 90% | 55,071 psi | 88% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,592 psi | 88% | 2949 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 55,158 psi | 88% | 2900 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,376 psi | 90% | 2900 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,244 psi | 87% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,158 psi | 88% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,708 psi | 88% | 3015 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,202 psi | 90% | 2920 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,214 psi | 85% | 2890 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,637 psi | 89% | 3009 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,476 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,161 psi | 64% | 2743 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,889 psi | 72% | 2907 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,085 psi | 88% | 2917 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 53,243 psi | 85% | 2884 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,374 psi | 86% | 2851 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,912 psi | 90% | 2835 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,374 psi | 86% | 2877 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,492 psi | 89% | 2979 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,317 psi | 87% | 2897 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 54,027 psi | 87% | 2949 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 94% | 54,447 psi | 87% | 2907 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,724 psi | 89% | 2910 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,953 psi | 83% | 2877 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,332 psi | 89% | 2946 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,607 psi | 88% | 2982 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 57% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,592 psi | 86% | 2861 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,970 psi | 90% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,535 psi | 89% | 2881 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,811 psi | 89% | 2864 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 53,824 psi | 86% | 2881 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,259 psi | 89% | 2884 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,347 psi | 89% | 2943 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 54,592 psi | 88% | 2920 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,244 psi | 87% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,868 psi | 88% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,621 psi | 88% | 2825 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,419 psi | 89% | 2877 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,737 psi | 88% | 2881 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 55,579 psi | 89% | 2913 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 53,824 psi | 86% | 2844 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,665 psi | 88% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,115 psi | 90% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,273 psi | 87% | 2927 fps | 95.8% |
| Norma URP | <<locked>> | 98% | 53,592 psi | 86% | 2936 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 52,924 psi | 85% | 2900 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2989 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 54,563 psi | 87% | 2871 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,128 psi | 87% | 2887 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,839 psi | 88% | 2851 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,071 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,665 psi | 88% | 2881 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,679 psi | 86% | 2956 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,171 psi | 85% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,288 psi | 87% | 2972 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,838 psi | 86% | 2999 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 54,926 psi | 88% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,592 psi | 88% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,476 psi | 86% | 2881 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,374 psi | 86% | 2851 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,737 psi | 88% | 2881 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,868 psi | 88% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,419 psi | 89% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,579 psi | 89% | 2913 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,911 psi | 88% | 2936 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,376 psi | 90% | 2900 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,490 psi | 86% | 2867 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,332 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,738 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,100 psi | 88% | 2835 fps | 97.8% |
| Somchem S321 | <<locked>> | 82% | 55,492 psi | 89% | 2884 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,679 psi | 88% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,217 psi | 90% | 2894 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,679 psi | 86% | 2877 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2940 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,138 psi | 77% | 2818 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 82% | 54,926 psi | 88% | 2743 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,593 psi | 89% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,201 psi | 87% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,013 psi | 88% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,114 psi | 88% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,173 psi | 90% | 2933 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 54,621 psi | 88% | 2851 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,026 psi | 85% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,158 psi | 88% | 2940 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,135 psi | 71% | 2822 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,837 psi | 85% | 2861 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,578 psi | 88% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,027 psi | 87% | 2949 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,853 psi | 57% | 2743 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,490 psi | 86% | 2877 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% | 49,661 psi | 80% | 2707 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,395 psi | 68% | 2631 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,313 psi | 79% | 2782 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,369 psi | 76% | 2707 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 39,044 psi | 63% | 2651 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 40,059 psi | 64% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,794 psi | 54% | 2552 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 45,687 psi | 73% | 2740 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,870 psi | 62% | 2585 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,790 psi | 77% | 2746 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,370 psi | 78% | 2733 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,495 psi | 67% | 2769 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,609 psi | 62% | 2612 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,408 psi | 66% | 2674 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,866 psi | 54% | 2562 fps | 95.2% |
| Alliant Reloder-17 | 39.3 gr | 80% | 33,228 psi | 53% | 2572 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,285 psi | 50% | 2520 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,390 psi | 58% | 2710 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,136 psi | 72% | 2746 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 38,247 psi | 61% | 2615 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 47,268 psi | 76% | 2746 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,356 psi | 79% | 2733 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,630 psi | 75% | 2766 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,793 psi | 83% | 2920 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,030 psi | 63% | 2615 fps | 96.4% |
| Hodgdon H414 | 43.3 gr | 90% | 44,208 psi | 71% | 2776 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 90% | 47,935 psi | 77% | 2795 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 46,137 psi | 74% | 2749 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,298 psi | 47% | 2408 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,279 psi | 68% | 2723 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 47,181 psi | 76% | 2854 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 42% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,309 psi | 71% | 2703 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,818 psi | 73% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,785 psi | 65% | 2621 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,352 psi | 70% | 2644 fps | 95.2% |
| IMR 4350 | <<locked>> | 94% | 47,442 psi | 76% | 2772 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,308 psi | 69% | 2671 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 34,824 psi | 56% | 2559 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,409 psi | 68% | 2703 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,790 psi | 77% | 2746 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,846 psi | 72% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,672 psi | 73% | 2677 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 40,828 psi | 65% | 2628 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,898 psi | 61% | 2566 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 43,381 psi | 70% | 2700 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 44,817 psi | 72% | 2690 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,121 psi | 72% | 2700 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,756 psi | 65% | 2664 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 50,923 psi | 82% | 2871 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 33,939 psi | 54% | 2549 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,234 psi | 65% | 2674 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 40,538 psi | 65% | 2707 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,587 psi | 76% | 2753 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,398 psi | 76% | 2776 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,416 psi | 82% | 2795 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 43% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,163 psi | 68% | 2654 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,627 psi | 70% | 2779 fps | 98.6% |
| ReloadSwiss RS 60 | 39.3 gr | 80% | 35,375 psi | 57% | 2641 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,752 psi | 57% | 2621 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,305 psi | 61% | 2687 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 48,675 psi | 78% | 2730 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,757 psi | 69% | 2644 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,042 psi | 58% | 2556 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 47,268 psi | 76% | 2746 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,898 psi | 61% | 2566 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,846 psi | 72% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,828 psi | 65% | 2628 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,381 psi | 70% | 2700 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,912 psi | 59% | 2605 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,992 psi | 74% | 2726 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,106 psi | 71% | 2707 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,180 psi | 74% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,508 psi | 62% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,397 psi | 73% | 2671 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 51,895 psi | 83% | 2831 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,716 psi | 73% | 2644 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,934 psi | 74% | 2726 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,854 psi | 59% | 2566 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 26,789 psi | 43% | 2388 fps | 95.5% |
| Somchem S385 | <<locked>> | 98% | 44,904 psi | 72% | 2759 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 52,040 psi | 83% | 2703 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,543 psi | 75% | 2638 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,293 psi | 68% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,757 psi | 69% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,041 psi | 56% | 2500 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 35,621 psi | 57% | 2556 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 47,892 psi | 77% | 2743 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 41,118 psi | 66% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,940 psi | 56% | 2552 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 31,734 psi | 51% | 2543 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,125 psi | 50% | 2425 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 47,877 psi | 77% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,208 psi | 71% | 2776 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,573 psi | 47% | 2539 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,598 psi | 70% | 2710 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 .263 | 120gr | Rhino Solid Shank. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,015 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 0.263" calls for a 1:11.0 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 .263 | 120gr | Rhino Solid Shank 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.