Load Specifications
Load data in caliber .260 Rem. with .264 | 130gr | Sierra Tipped MatchKing 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 Winchester 760.
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>> | 82% | 51,982 psi | 86% | 2605 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,867 psi | 89% | 2671 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 51,735 psi | 86% | 2684 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,098 psi | 88% | 2674 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,741 psi | 68% | 2569 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 53,693 psi | 89% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,185 psi | 88% | 2795 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,447 psi | 90% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 51,851 psi | 86% | 2697 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,345 psi | 89% | 2700 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,070 psi | 90% | 2674 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,780 psi | 89% | 2861 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 51,735 psi | 86% | 2720 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,344 psi | 87% | 2740 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 51,256 psi | 85% | 2799 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,301 psi | 87% | 2838 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,204 psi | 65% | 2602 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,468 psi | 72% | 2753 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,041 psi | 90% | 2766 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 52,286 psi | 87% | 2736 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,707 psi | 88% | 2707 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 51,837 psi | 86% | 2638 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,663 psi | 87% | 2730 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,331 psi | 90% | 2822 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 53,185 psi | 88% | 2746 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 52,910 psi | 88% | 2799 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 53,345 psi | 89% | 2756 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 51,517 psi | 86% | 2710 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,952 psi | 85% | 2733 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,070 psi | 90% | 2789 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,272 psi | 89% | 2828 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 59% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 52,489 psi | 87% | 2710 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 51,532 psi | 86% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 51,503 psi | 86% | 2684 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 51,387 psi | 85% | 2657 fps | 97.4% |
| IMR 4350 | <<locked>> | 98% | 52,707 psi | 88% | 2730 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,346 psi | 90% | 2736 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,853 psi | 89% | 2789 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 53,679 psi | 89% | 2769 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,345 psi | 89% | 2700 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,012 psi | 90% | 2726 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,708 psi | 89% | 2674 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 51,430 psi | 85% | 2680 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,882 psi | 90% | 2733 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 51,256 psi | 85% | 2710 fps | 97.7% |
| Norma 201 | <<locked>> | 86% | 52,866 psi | 88% | 2694 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,388 psi | 89% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 88% | 51,590 psi | 86% | 2726 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 53,098 psi | 88% | 2776 fps | 95.9% |
| Norma URP | <<locked>> | 98% | 52,591 psi | 87% | 2789 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 51,938 psi | 86% | 2753 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 51,271 psi | 85% | 2779 fps | 98.3% |
| Ramshot TAC | <<locked>> | 84% | 53,359 psi | 89% | 2717 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,127 psi | 88% | 2736 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,998 psi | 90% | 2700 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 60% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,403 psi | 89% | 2726 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,823 psi | 88% | 2805 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 52,141 psi | 87% | 2838 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,142 psi | 88% | 2822 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 52,707 psi | 88% | 2848 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 54,244 psi | 90% | 2677 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,766 psi | 89% | 2697 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 52,141 psi | 87% | 2726 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 52,707 psi | 88% | 2707 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,882 psi | 90% | 2733 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,012 psi | 90% | 2726 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 51,430 psi | 85% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 51,256 psi | 85% | 2710 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,679 psi | 89% | 2782 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 51,735 psi | 86% | 2694 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,765 psi | 88% | 2723 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 51,300 psi | 85% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 51,590 psi | 86% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,143 psi | 90% | 2687 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 54,302 psi | 90% | 2730 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,795 psi | 89% | 2631 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 51,271 psi | 85% | 2684 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 52,692 psi | 88% | 2726 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,488 psi | 84% | 2789 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,978 psi | 78% | 2674 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 82% | 54,346 psi | 90% | 2598 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 51,590 psi | 86% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,084 psi | 88% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,041 psi | 90% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,099 psi | 90% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 51,648 psi | 86% | 2733 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 53,766 psi | 89% | 2700 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 52,040 psi | 86% | 2671 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,215 psi | 90% | 2792 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,931 psi | 71% | 2674 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 51,619 psi | 86% | 2710 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,679 psi | 89% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 52,910 psi | 88% | 2799 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,983 psi | 58% | 2602 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,562 psi | 87% | 2730 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% | 48,994 psi | 81% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,510 psi | 69% | 2490 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,370 psi | 80% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,630 psi | 77% | 2569 fps | 95.5% |
| Accurate 3100 | <<locked>> | 98% | 37,942 psi | 63% | 2513 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 39,247 psi | 65% | 2487 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,982 psi | 55% | 2421 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,092 psi | 75% | 2598 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 38,145 psi | 63% | 2451 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,166 psi | 78% | 2605 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,311 psi | 79% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,799 psi | 68% | 2628 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,898 psi | 63% | 2474 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,799 psi | 68% | 2536 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,286 psi | 55% | 2428 fps | 95.5% |
| Alliant Reloder-17 | 36.3 gr | 80% | 32,822 psi | 55% | 2448 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,761 psi | 48% | 2336 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,520 psi | 59% | 2572 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,179 psi | 73% | 2602 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 37,434 psi | 62% | 2477 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 43,627 psi | 72% | 2549 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,631 psi | 81% | 2589 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,861 psi | 76% | 2625 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,792 psi | 84% | 2769 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 38,334 psi | 64% | 2480 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 90% | 43,265 psi | 72% | 2631 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 47,123 psi | 78% | 2651 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,498 psi | 76% | 2608 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,805 psi | 48% | 2287 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,350 psi | 69% | 2579 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 92% | 46,296 psi | 77% | 2710 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 44% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,366 psi | 72% | 2556 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,121 psi | 75% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,001 psi | 66% | 2480 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,627 psi | 71% | 2503 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 43,627 psi | 72% | 2575 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,627 psi | 71% | 2533 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 32,111 psi | 53% | 2382 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 41,771 psi | 69% | 2566 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 47,166 psi | 78% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,121 psi | 73% | 2575 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,875 psi | 75% | 2533 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 40,059 psi | 67% | 2487 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 37,275 psi | 62% | 2431 fps | 95.3% |
| Lovex S070 | <<locked>> | 90% | 42,757 psi | 71% | 2566 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,063 psi | 73% | 2549 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,411 psi | 74% | 2556 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,161 psi | 67% | 2526 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 49,603 psi | 82% | 2717 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 33,388 psi | 55% | 2421 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,523 psi | 66% | 2536 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 39,436 psi | 66% | 2562 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 47,036 psi | 78% | 2615 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,354 psi | 77% | 2628 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,734 psi | 84% | 2651 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 45% | 1526 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,220 psi | 68% | 2516 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,888 psi | 71% | 2638 fps | 98.8% |
| ReloadSwiss RS 60 | 36.3 gr | 80% | 34,911 psi | 58% | 2510 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,954 psi | 58% | 2487 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,637 psi | 63% | 2552 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 47,979 psi | 80% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,887 psi | 70% | 2503 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,389 psi | 59% | 2425 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 43,627 psi | 72% | 2549 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,275 psi | 62% | 2431 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,121 psi | 73% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,059 psi | 67% | 2487 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 90% | 42,757 psi | 71% | 2566 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,274 psi | 60% | 2474 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,339 psi | 75% | 2589 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,468 psi | 72% | 2569 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,440 psi | 75% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,855 psi | 63% | 2375 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,655 psi | 69% | 2480 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 50,908 psi | 85% | 2680 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,976 psi | 75% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,991 psi | 75% | 2582 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,158 psi | 60% | 2431 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 26,324 psi | 44% | 2270 fps | 95.9% |
| Somchem S385 | <<locked>> | 98% | 43,932 psi | 73% | 2618 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 51,271 psi | 85% | 2556 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,788 psi | 76% | 2493 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,539 psi | 69% | 2487 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,061 psi | 70% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,432 psi | 57% | 2372 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 84% | 34,896 psi | 58% | 2425 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 46,992 psi | 78% | 2598 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,422 psi | 67% | 2484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,330 psi | 57% | 2428 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 30,850 psi | 51% | 2411 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,487 psi | 51% | 2297 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 46,891 psi | 78% | 2644 fps | 100% |
| Winchester 760 | 39.9 gr | 90% | 43,265 psi | 72% | 2631 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,834 psi | 48% | 2411 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,801 psi | 71% | 2569 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 Rem. loaded with the .264 | 130gr | Sierra Tipped MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,861 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 (415 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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 Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .260 Rem. with the .264 | 130gr | Sierra Tipped MatchKing 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.