Load Specifications
Load data in caliber .260 Rem. with .264 | 120gr | Hornady GMX 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, ReloadSwiss RS 60 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>> | 86% | 53,272 psi | 89% | 2733 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 51,343 psi | 85% | 2749 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,273 psi | 90% | 2795 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,447 psi | 89% | 2818 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,041 psi | 90% | 2835 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,009 psi | 83% | 2851 fps | 98.7% |
| ADI AR 2206H | <<locked>> | 88% | 52,286 psi | 87% | 2822 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 53,476 psi | 89% | 2822 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 51,779 psi | 86% | 2782 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 51,808 psi | 86% | 2762 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,272 psi | 89% | 2884 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 51,895 psi | 86% | 2936 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 52,808 psi | 88% | 2841 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,026 psi | 88% | 2736 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,534 psi | 89% | 2861 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,124 psi | 82% | 2861 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,447 psi | 89% | 2959 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,563 psi | 57% | 2579 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 52,214 psi | 87% | 2838 fps | 99.1% |
| Bofors RP3 | <<locked>> | 94% | 53,098 psi | 88% | 2854 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,882 psi | 90% | 2818 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,577 psi | 89% | 2766 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,143 psi | 90% | 2861 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 52,489 psi | 87% | 2904 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 52,069 psi | 87% | 2776 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,330 psi | 89% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 51,155 psi | 85% | 2815 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,969 psi | 90% | 2913 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 88% | 52,794 psi | 88% | 2835 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,426 psi | 75% | 2743 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 51,909 psi | 86% | 2867 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,751 psi | 58% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 50,966 psi | 85% | 2789 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 52,576 psi | 87% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,026 psi | 88% | 2808 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,548 psi | 89% | 2785 fps | 96.8% |
| IMR 4198 | <<locked>> | 82% | 53,606 psi | 89% | 2700 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 52,997 psi | 88% | 2808 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,863 psi | 80% | 2799 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 51,692 psi | 86% | 2844 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 51,779 psi | 86% | 2782 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 51,285 psi | 85% | 2762 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 51,634 psi | 86% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 52,460 psi | 87% | 2756 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 52,533 psi | 87% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 51,634 psi | 86% | 2795 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,286 psi | 87% | 2825 fps | 96.8% |
| Norma 201 | <<locked>> | 88% | 50,981 psi | 85% | 2769 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 51,517 psi | 86% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 92% | 52,692 psi | 88% | 2848 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 49,937 psi | 83% | 2848 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 53,388 psi | 89% | 2877 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,849 psi | 81% | 2835 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 52,228 psi | 87% | 2795 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 86% | 51,343 psi | 85% | 2812 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 52,562 psi | 87% | 2779 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,157 psi | 58% | 1762 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 51,329 psi | 85% | 2766 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 51,692 psi | 86% | 2795 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,737 psi | 89% | 2927 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,287 psi | 89% | 2963 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,009 psi | 83% | 2877 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,560 psi | 84% | 2900 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 86% | 52,141 psi | 87% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 51,445 psi | 85% | 2769 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 52,997 psi | 88% | 2844 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 53,882 psi | 90% | 2818 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 51,634 psi | 86% | 2795 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 51,634 psi | 86% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 52,533 psi | 87% | 2805 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,286 psi | 87% | 2825 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 51,576 psi | 86% | 2858 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,186 psi | 90% | 2762 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,766 psi | 89% | 2822 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,172 psi | 90% | 2844 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,084 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 52,982 psi | 88% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 52,156 psi | 87% | 2749 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 52,866 psi | 88% | 2815 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 52,156 psi | 87% | 2717 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,287 psi | 89% | 2818 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 53,780 psi | 89% | 2848 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,280 psi | 74% | 2795 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 84% | 52,968 psi | 88% | 2687 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,258 psi | 88% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,230 psi | 90% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 52,272 psi | 87% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 51,750 psi | 86% | 2779 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,344 psi | 87% | 2844 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 52,156 psi | 87% | 2782 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,751 psi | 89% | 2802 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,590 psi | 86% | 2851 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,956 psi | 61% | 2654 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,577 psi | 89% | 2835 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 51,605 psi | 86% | 2825 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,969 psi | 90% | 2913 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,201 psi | 90% | 2858 fps | 99.9% |
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% | 44,237 psi | 73% | 2598 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,935 psi | 80% | 2700 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,216 psi | 60% | 2503 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,308 psi | 72% | 2657 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 34,258 psi | 57% | 2490 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 35,128 psi | 58% | 2566 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 40,480 psi | 67% | 2608 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 34,432 psi | 57% | 2457 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,554 psi | 71% | 2625 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 42,148 psi | 70% | 2618 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,603 psi | 82% | 2825 fps | 99.7% |
| Alliant Power Pro 2000-MR | 36.3 gr | 80% | 36,767 psi | 61% | 2625 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,750 psi | 56% | 2477 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,821 psi | 83% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,245 psi | 60% | 2536 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,042 psi | 60% | 2585 fps | 95.2% |
| Alliant Reloder-17 | 36.6 gr | 82% | 31,067 psi | 52% | 2487 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 32,532 psi | 54% | 2526 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,581 psi | 66% | 2608 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 32,938 psi | 55% | 2474 fps | 96.9% |
| Bofors RP7 | <<locked>> | 96% | 50,705 psi | 84% | 2769 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,570 psi | 74% | 2618 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,147 psi | 68% | 2644 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,252 psi | 75% | 2779 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 48,892 psi | 81% | 2726 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,864 psi | 83% | 2753 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 39,015 psi | 65% | 2589 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 96% | 46,949 psi | 78% | 2795 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 40,799 psi | 68% | 2621 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,705 psi | 51% | 2425 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,941 psi | 61% | 2589 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,933 psi | 43% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,334 psi | 65% | 2575 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 40,190 psi | 67% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,071 psi | 60% | 2490 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,876 psi | 78% | 2674 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 50,357 psi | 84% | 2657 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 46,746 psi | 78% | 2700 fps | 95.1% |
| IMR 4831 | <<locked>> | 92% | 36,535 psi | 61% | 2579 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 37,115 psi | 62% | 2569 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,554 psi | 71% | 2625 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 47,863 psi | 80% | 2710 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,204 psi | 65% | 2592 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 41,046 psi | 68% | 2556 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 35,839 psi | 60% | 2497 fps | 98% |
| Lovex S065 | <<locked>> | 90% | 40,335 psi | 67% | 2589 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 46,006 psi | 76% | 2717 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 39,610 psi | 66% | 2566 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 39,958 psi | 66% | 2582 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,650 psi | 59% | 2526 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 35,897 psi | 60% | 2575 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 35,346 psi | 59% | 2539 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 96% | 43,018 psi | 71% | 2726 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 42,583 psi | 71% | 2621 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,959 psi | 70% | 2648 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,079 psi | 77% | 2671 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,092 psi | 43% | 1575 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,950 psi | 80% | 2710 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 45,223 psi | 75% | 2684 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,666 psi | 63% | 2631 fps | 96.6% |
| ReloadSwiss RS 60 | 35.7 gr | 80% | 30,980 psi | 51% | 2493 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 37,666 psi | 63% | 2641 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,191 psi | 68% | 2717 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 43,178 psi | 72% | 2612 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,608 psi | 62% | 2516 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 31,024 psi | 52% | 2418 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 96% | 50,705 psi | 84% | 2769 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,335 psi | 67% | 2589 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,204 psi | 65% | 2592 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 35,839 psi | 60% | 2497 fps | 98% |
| Shooters World SW4350 | <<locked>> | 96% | 46,006 psi | 76% | 2717 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,126 psi | 53% | 2464 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,865 psi | 85% | 2717 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,495 psi | 67% | 2592 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,015 psi | 65% | 2575 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,350 psi | 69% | 2533 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,069 psi | 57% | 2395 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 45,498 psi | 76% | 2641 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 45,876 psi | 76% | 2700 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 40,799 psi | 68% | 2533 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,292 psi | 67% | 2592 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 32,068 psi | 53% | 2431 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 27,978 psi | 46% | 2405 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 46,891 psi | 78% | 2602 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,626 psi | 69% | 2533 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,912 psi | 61% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,840 psi | 63% | 2516 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 30,516 psi | 51% | 2372 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 37,681 psi | 63% | 2579 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 42,627 psi | 71% | 2618 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 36,318 psi | 60% | 2503 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 36,796 psi | 61% | 2575 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 34,664 psi | 58% | 2602 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,241 psi | 52% | 2398 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 41,843 psi | 70% | 2661 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 47,326 psi | 79% | 2802 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,450 psi | 64% | 2582 fps | 98% |
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 Rem. loaded with the .264 | 120gr | Hornady GMX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,963 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 (415 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:8.0 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, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .260 Rem. with the .264 | 120gr | Hornady GMX 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.