Load Specifications
Load data in caliber .260 Rem. with .264 | 140gr | Speer Impact bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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.
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>> | 82% | 53,969 psi | 90% | 2526 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,142 psi | 88% | 2556 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 51,938 psi | 86% | 2562 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,250 psi | 72% | 2523 fps | 97.5% |
| Accurate 4064 | <<locked>> | 88% | 53,142 psi | 88% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 52,649 psi | 87% | 2687 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 53,171 psi | 88% | 2631 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,056 psi | 90% | 2631 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,097 psi | 85% | 2667 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 52,344 psi | 87% | 2585 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,156 psi | 88% | 2552 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,881 psi | 88% | 2746 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,215 psi | 90% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 51,677 psi | 86% | 2628 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,940 psi | 90% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 51,314 psi | 85% | 2720 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,922 psi | 83% | 2654 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,220 psi | 68% | 2552 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,093 psi | 77% | 2710 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 52,692 psi | 88% | 2644 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 51,401 psi | 85% | 2618 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 51,605 psi | 86% | 2595 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,708 psi | 89% | 2562 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 51,329 psi | 85% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 52,156 psi | 87% | 2631 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 51,851 psi | 86% | 2684 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 52,446 psi | 87% | 2644 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 84% | 53,693 psi | 89% | 2638 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,563 psi | 89% | 2667 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,229 psi | 88% | 2674 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,011 psi | 86% | 2717 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 60% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 51,590 psi | 86% | 2595 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,911 psi | 90% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,664 psi | 89% | 2615 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,417 psi | 89% | 2595 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 51,866 psi | 86% | 2621 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,577 psi | 89% | 2628 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 53,272 psi | 89% | 2680 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 52,968 psi | 88% | 2654 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 52,344 psi | 87% | 2585 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,011 psi | 88% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 52,562 psi | 87% | 2559 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,679 psi | 89% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 52,895 psi | 88% | 2621 fps | 99.2% |
| Lovex S070 | <<locked>> | 96% | 53,853 psi | 89% | 2654 fps | 98.7% |
| Norma 201 | <<locked>> | 84% | 51,938 psi | 86% | 2575 fps | 100% |
| Norma 202 | <<locked>> | 84% | 52,475 psi | 87% | 2575 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,012 psi | 90% | 2661 fps | 100% |
| Norma 204 | <<locked>> | 96% | 52,344 psi | 87% | 2671 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 46,122 psi | 77% | 2671 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 51,953 psi | 86% | 2677 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 51,198 psi | 85% | 2638 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,838 psi | 89% | 2723 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 52,214 psi | 87% | 2602 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 52,098 psi | 87% | 2621 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 60% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 52,417 psi | 87% | 2615 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 51,880 psi | 86% | 2687 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 51,068 psi | 85% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 52,402 psi | 87% | 2710 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 51,764 psi | 86% | 2736 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 53,084 psi | 88% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 52,417 psi | 87% | 2575 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 51,677 psi | 86% | 2618 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,718 psi | 81% | 2638 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 92% | 51,605 psi | 86% | 2595 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 52,895 psi | 88% | 2621 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,011 psi | 88% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,679 psi | 89% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,853 psi | 89% | 2654 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 52,910 psi | 88% | 2671 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,157 psi | 90% | 2631 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 51,692 psi | 86% | 2605 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,563 psi | 89% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,780 psi | 89% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,098 psi | 88% | 2579 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,254 psi | 80% | 2631 fps | 96.2% |
| Somchem S335 | <<locked>> | 84% | 52,750 psi | 88% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,722 psi | 89% | 2621 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 51,706 psi | 86% | 2612 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,374 psi | 89% | 2726 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,501 psi | 82% | 2621 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 53,896 psi | 90% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 52,576 psi | 87% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,200 psi | 88% | 2562 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,098 psi | 88% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,143 psi | 90% | 2671 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 52,359 psi | 87% | 2579 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,433 psi | 90% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,200 psi | 88% | 2677 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,571 psi | 76% | 2625 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,070 psi | 90% | 2648 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,562 psi | 87% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 52,286 psi | 87% | 2690 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,869 psi | 61% | 2572 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 51,590 psi | 86% | 2615 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% | 50,850 psi | 84% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,845 psi | 73% | 2428 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,670 psi | 71% | 2408 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 35,433 psi | 59% | 2375 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,495 psi | 69% | 2428 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,443 psi | 51% | 2270 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,949 psi | 78% | 2533 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,943 psi | 66% | 2395 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 98% | 48,109 psi | 80% | 2618 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,023 psi | 81% | 2536 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,864 psi | 83% | 2513 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,786 psi | 71% | 2575 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,653 psi | 66% | 2418 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,612 psi | 71% | 2477 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,864 psi | 51% | 2283 fps | 95.4% |
| Alliant Reloder-17 | 35.8 gr | 80% | 34,432 psi | 57% | 2402 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,036 psi | 78% | 2605 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,934 psi | 45% | 2205 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,518 psi | 54% | 2415 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,224 psi | 77% | 2543 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 39,624 psi | 66% | 2428 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 42,946 psi | 71% | 2451 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,691 psi | 84% | 2520 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,008 psi | 80% | 2559 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,132 psi | 67% | 2428 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 39,885 psi | 66% | 2474 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 43,627 psi | 72% | 2497 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 47,384 psi | 79% | 2543 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,384 psi | 47% | 2195 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,439 psi | 72% | 2523 fps | 99.9% |
| Hodgdon Superformance | 41.6 gr | 88% | 42,206 psi | 70% | 2543 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 44% | 1434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,455 psi | 76% | 2497 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,572 psi | 79% | 2533 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,959 psi | 70% | 2428 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,251 psi | 74% | 2444 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 40,451 psi | 67% | 2428 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,247 psi | 65% | 2379 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 29,733 psi | 49% | 2238 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 43,642 psi | 73% | 2507 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 49,023 psi | 81% | 2536 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,267 psi | 77% | 2510 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,818 psi | 78% | 2470 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,047 psi | 70% | 2431 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,635 psi | 58% | 2290 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 39,595 psi | 66% | 2411 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,122 psi | 77% | 2490 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,238 psi | 77% | 2487 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,959 psi | 70% | 2467 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 45,701 psi | 76% | 2559 fps | 95% |
| Norma MRP | <<locked>> | 96% | 40,292 psi | 67% | 2556 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 30,821 psi | 51% | 2274 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,568 psi | 69% | 2484 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 36,695 psi | 61% | 2415 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,979 psi | 81% | 2552 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,443 psi | 80% | 2566 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 45% | 1467 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,625 psi | 67% | 2415 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,121 psi | 75% | 2579 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,651 psi | 61% | 2461 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,285 psi | 54% | 2339 fps | 95.6% |
| ReloadSwiss RS 70 | 38.1 gr | 84% | 34,432 psi | 57% | 2395 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 50,082 psi | 83% | 2516 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,874 psi | 73% | 2444 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,144 psi | 62% | 2372 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 98% | 45,803 psi | 76% | 2589 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 42,946 psi | 71% | 2451 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,635 psi | 58% | 2290 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,267 psi | 77% | 2510 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,047 psi | 70% | 2431 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 39,595 psi | 66% | 2411 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,101 psi | 63% | 2421 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,398 psi | 79% | 2530 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,353 psi | 75% | 2503 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,427 psi | 79% | 2434 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,624 psi | 66% | 2316 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,392 psi | 64% | 2329 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,382 psi | 75% | 2585 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 46,992 psi | 78% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,065 psi | 78% | 2523 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,058 psi | 63% | 2379 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 27,644 psi | 46% | 2231 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 40,683 psi | 68% | 2470 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 47,790 psi | 79% | 2425 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,671 psi | 73% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,830 psi | 73% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,013 psi | 60% | 2316 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 32,213 psi | 54% | 2277 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 49,298 psi | 82% | 2533 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,192 psi | 70% | 2421 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,589 psi | 52% | 2277 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 28,747 psi | 48% | 2270 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,894 psi | 53% | 2254 fps | 97.8% |
| Winchester 748 | <<locked>> | 80% | 49,139 psi | 82% | 2579 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,147 psi | 67% | 2480 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,818 psi | 45% | 2274 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,165 psi | 75% | 2513 fps | 99.9% |
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 116 powders for .260 Rem. loaded with the .264 | 140gr | Speer Impact. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,746 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 140.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .260 Rem. with the .264 | 140gr | Speer Impact they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, 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.