Load Specifications
Load data in caliber .260 Rem. with .264 | 125gr | Hammer HHT bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Alliant Power Pro 2000-MR and ReloadSwiss RS 60.
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% | 52,533 psi | 87% | 2657 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,331 psi | 90% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,634 psi | 87% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,983 psi | 90% | 2723 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 54,041 psi | 90% | 2769 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,722 psi | 89% | 2848 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 51,590 psi | 86% | 2749 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 52,576 psi | 87% | 2749 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,027 psi | 90% | 2756 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 51,097 psi | 85% | 2687 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,433 psi | 90% | 2917 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,257 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,953 psi | 88% | 2792 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,953 psi | 86% | 2851 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,982 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,028 psi | 62% | 2589 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,089 psi | 68% | 2736 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 51,256 psi | 85% | 2762 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 52,808 psi | 88% | 2789 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,171 psi | 88% | 2753 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,939 psi | 88% | 2697 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,229 psi | 88% | 2785 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,517 psi | 86% | 2825 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 92% | 53,853 psi | 89% | 2799 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 98% | 53,069 psi | 88% | 2841 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 96% | 54,128 psi | 90% | 2805 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 52,112 psi | 87% | 2762 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,037 psi | 80% | 2730 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 51,401 psi | 85% | 2795 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,925 psi | 90% | 2874 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 59% | 1690 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,592 psi | 89% | 2769 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 51,924 psi | 86% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 52,156 psi | 87% | 2736 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,605 psi | 87% | 2717 fps | 97% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,084 psi | 88% | 2776 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,141 psi | 87% | 2740 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,749 psi | 84% | 2785 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 54,288 psi | 90% | 2822 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 54,027 psi | 90% | 2756 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,404 psi | 90% | 2743 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 51,343 psi | 85% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 51,866 psi | 86% | 2687 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 51,982 psi | 86% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,244 psi | 90% | 2779 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 51,880 psi | 86% | 2759 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 53,940 psi | 90% | 2753 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,375 psi | 90% | 2753 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,127 psi | 87% | 2779 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,750 psi | 88% | 2835 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 90% | 52,504 psi | 87% | 2802 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,866 psi | 86% | 2831 fps | 97.9% |
| Ramshot TAC | <<locked>> | 84% | 51,126 psi | 85% | 2720 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,795 psi | 89% | 2789 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,793 psi | 86% | 2710 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 60% | 1732 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,577 psi | 89% | 2736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 51,126 psi | 85% | 2730 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,214 psi | 88% | 2858 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,765 psi | 88% | 2894 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,185 psi | 88% | 2867 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,229 psi | 88% | 2890 fps | 99% |
| Rottweil R 901 | <<locked>> | 84% | 51,721 psi | 86% | 2687 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,462 psi | 90% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,678 psi | 88% | 2779 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,171 psi | 88% | 2753 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,244 psi | 90% | 2779 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 51,343 psi | 85% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,982 psi | 86% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 51,880 psi | 86% | 2759 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,288 psi | 90% | 2838 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,765 psi | 88% | 2749 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,461 psi | 89% | 2776 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 52,460 psi | 87% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 52,359 psi | 87% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,488 psi | 86% | 2684 fps | 96.8% |
| Somchem S321 | <<locked>> | 82% | 51,837 psi | 86% | 2740 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,808 psi | 86% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,286 psi | 87% | 2743 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 53,301 psi | 89% | 2779 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,079 psi | 78% | 2785 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 52,330 psi | 87% | 2618 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,634 psi | 87% | 2638 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,998 psi | 90% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 51,576 psi | 86% | 2687 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,433 psi | 90% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 51,866 psi | 86% | 2779 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 84% | 51,314 psi | 85% | 2707 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,098 psi | 88% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 50,908 psi | 85% | 2782 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,726 psi | 66% | 2657 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,562 psi | 87% | 2766 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,215 psi | 90% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,505 psi | 89% | 2848 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,040 psi | 55% | 2572 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,185 psi | 88% | 2782 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% | 46,528 psi | 77% | 2572 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,378 psi | 65% | 2500 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,876 psi | 76% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,546 psi | 84% | 2667 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 37,231 psi | 62% | 2493 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,433 psi | 59% | 2516 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 42,859 psi | 71% | 2598 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,477 psi | 61% | 2451 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,933 psi | 75% | 2608 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,904 psi | 75% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | 36.1 gr | 80% | 38,754 psi | 64% | 2618 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,824 psi | 60% | 2470 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,653 psi | 64% | 2533 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,810 psi | 59% | 2526 fps | 95.7% |
| Alliant Reloder-17 | 35.6 gr | 80% | 31,096 psi | 52% | 2434 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,850 psi | 51% | 2428 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,058 psi | 63% | 2667 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,018 psi | 70% | 2602 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 35,549 psi | 59% | 2477 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 47,195 psi | 78% | 2654 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,818 psi | 78% | 2598 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,526 psi | 72% | 2628 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,109 psi | 80% | 2769 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 36,274 psi | 60% | 2474 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 92% | 43,613 psi | 72% | 2677 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 94% | 50,981 psi | 85% | 2756 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,236 psi | 72% | 2608 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,966 psi | 51% | 2379 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,117 psi | 65% | 2579 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 47,036 psi | 78% | 2756 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 44% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,553 psi | 69% | 2562 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 42,873 psi | 71% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,290 psi | 64% | 2484 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,137 psi | 77% | 2605 fps | 95.6% |
| IMR 4350 | <<locked>> | 96% | 47,152 psi | 78% | 2677 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 46,064 psi | 77% | 2635 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 34,200 psi | 57% | 2470 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,566 psi | 66% | 2566 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 44,933 psi | 75% | 2608 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,850 psi | 84% | 2694 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,684 psi | 69% | 2579 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,192 psi | 72% | 2539 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 38,232 psi | 64% | 2490 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 40,161 psi | 67% | 2530 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 43,120 psi | 72% | 2608 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 42,134 psi | 70% | 2556 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 42,119 psi | 70% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,014 psi | 63% | 2523 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 35,897 psi | 60% | 2520 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,420 psi | 62% | 2533 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 42,496 psi | 71% | 2664 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 44,962 psi | 75% | 2615 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,135 psi | 73% | 2631 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,530 psi | 81% | 2654 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,426 psi | 44% | 1542 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,502 psi | 84% | 2690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,930 psi | 70% | 2566 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,277 psi | 67% | 2631 fps | 97.8% |
| ReloadSwiss RS 60 | 35.6 gr | 80% | 33,083 psi | 55% | 2500 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,317 psi | 59% | 2533 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,029 psi | 63% | 2595 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,948 psi | 76% | 2595 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,059 psi | 67% | 2510 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 33,301 psi | 55% | 2418 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 47,195 psi | 78% | 2654 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,161 psi | 67% | 2530 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,684 psi | 69% | 2579 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,232 psi | 64% | 2490 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 92% | 43,120 psi | 72% | 2608 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,316 psi | 57% | 2467 fps | 96.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,091 psi | 72% | 2585 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,365 psi | 69% | 2569 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,613 psi | 72% | 2513 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,143 psi | 60% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 45,150 psi | 75% | 2579 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 48,544 psi | 81% | 2687 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,163 psi | 72% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,801 psi | 71% | 2585 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 34,403 psi | 57% | 2431 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 26,571 psi | 44% | 2310 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 49,284 psi | 82% | 2575 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,903 psi | 73% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,465 psi | 66% | 2497 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,885 psi | 66% | 2500 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,503 psi | 54% | 2365 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 35,085 psi | 58% | 2464 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 45,078 psi | 75% | 2605 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,348 psi | 64% | 2487 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,869 psi | 61% | 2523 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 32,953 psi | 55% | 2503 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,995 psi | 51% | 2343 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 44,483 psi | 74% | 2651 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 43,613 psi | 72% | 2677 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,966 psi | 51% | 2503 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,596 psi | 67% | 2569 fps | 98.8% |
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 110 powders for .260 Rem. loaded with the .264 | 125gr | Hammer HHT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,917 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 53–90 %, 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, Alliant Power Pro 2000-MR, ReloadSwiss RS 60 rank at the top here: for .260 Rem. with the .264 | 125gr | Hammer HHT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.