Load Specifications
Load data in caliber .260 Rem. with .264 | 140gr | Sierra 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 ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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 2495 | <<locked>> | 86% | 54,389 psi | 90% | 2582 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,098 psi | 88% | 2592 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,005 psi | 75% | 2562 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 51,213 psi | 85% | 2585 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,389 psi | 90% | 2720 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 51,227 psi | 85% | 2612 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,272 psi | 87% | 2615 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,373 psi | 87% | 2700 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,417 psi | 89% | 2608 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,128 psi | 90% | 2776 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,446 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 52,678 psi | 88% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 52,011 psi | 86% | 2723 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,881 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,561 psi | 86% | 2694 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,496 psi | 71% | 2585 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,362 psi | 62% | 2493 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,037 psi | 80% | 2756 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,317 psi | 90% | 2677 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 52,823 psi | 88% | 2651 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 52,794 psi | 88% | 2625 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,678 psi | 88% | 2638 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,853 psi | 89% | 2667 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 53,461 psi | 89% | 2720 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 53,954 psi | 90% | 2684 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 51,735 psi | 86% | 2618 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 51,967 psi | 86% | 2654 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,155 psi | 85% | 2651 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,635 psi | 89% | 2753 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 60% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,939 psi | 88% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,982 psi | 86% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 51,619 psi | 86% | 2595 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,271 psi | 85% | 2579 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 53,287 psi | 89% | 2657 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 51,358 psi | 85% | 2605 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 51,706 psi | 86% | 2667 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,041 psi | 90% | 2680 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,417 psi | 89% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 50,966 psi | 85% | 2589 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,925 psi | 90% | 2592 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 51,663 psi | 86% | 2595 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,433 psi | 90% | 2654 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 51,909 psi | 86% | 2638 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,333 psi | 62% | 2421 fps | 96.1% |
| Norma 201 | <<locked>> | 84% | 53,417 psi | 89% | 2608 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,954 psi | 90% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 86% | 51,909 psi | 86% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,722 psi | 89% | 2703 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 47,674 psi | 79% | 2710 fps | 97.7% |
| Norma URP | <<locked>> | 96% | 53,592 psi | 89% | 2710 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 52,475 psi | 87% | 2667 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 52,156 psi | 87% | 2710 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 53,388 psi | 89% | 2631 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,374 psi | 89% | 2651 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 60% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,925 psi | 90% | 2651 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,432 psi | 89% | 2720 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,678 psi | 88% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,969 psi | 90% | 2743 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,403 psi | 89% | 2772 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 54,317 psi | 90% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,867 psi | 89% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,040 psi | 88% | 2648 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,140 psi | 83% | 2674 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 52,794 psi | 88% | 2625 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,433 psi | 90% | 2654 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 50,966 psi | 85% | 2589 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,663 psi | 86% | 2595 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 51,909 psi | 86% | 2638 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,126 psi | 85% | 2654 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 51,967 psi | 86% | 2612 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,997 psi | 88% | 2635 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 51,155 psi | 85% | 2500 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 51,576 psi | 86% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,157 psi | 90% | 2605 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,661 psi | 83% | 2667 fps | 96.7% |
| Somchem S335 | <<locked>> | 84% | 54,157 psi | 90% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 51,561 psi | 86% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,026 psi | 88% | 2641 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 51,793 psi | 86% | 2713 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,271 psi | 85% | 2661 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 82% | 51,547 psi | 86% | 2484 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,809 psi | 89% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,230 psi | 90% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,302 psi | 90% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,170 psi | 87% | 2654 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 53,795 psi | 89% | 2608 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,620 psi | 87% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 51,256 psi | 85% | 2657 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,166 psi | 78% | 2657 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,185 psi | 87% | 2635 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,041 psi | 90% | 2654 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,809 psi | 89% | 2723 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,101 psi | 63% | 2615 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,866 psi | 88% | 2641 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 47,964 psi | 80% | 2595 fps | 96% |
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 2495 | <<locked>> | 80% | 45,063 psi | 75% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,497 psi | 72% | 2434 fps | 95.8% |
| Accurate 3100 | <<locked>> | 92% | 34,287 psi | 57% | 2359 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 42,627 psi | 71% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,444 psi | 52% | 2303 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 47,993 psi | 80% | 2562 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,930 psi | 68% | 2425 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 46,195 psi | 77% | 2598 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,096 psi | 83% | 2562 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,034 psi | 73% | 2608 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,973 psi | 68% | 2451 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,656 psi | 73% | 2507 fps | 99.4% |
| Alliant Reloder-16 | 34.1 gr | 80% | 31,691 psi | 53% | 2316 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,230 psi | 59% | 2431 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 45,295 psi | 75% | 2585 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,586 psi | 46% | 2234 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,302 psi | 59% | 2444 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 88% | 31,473 psi | 52% | 2395 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,485 psi | 79% | 2572 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 40,654 psi | 68% | 2454 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,321 psi | 69% | 2431 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,342 psi | 82% | 2589 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,394 psi | 69% | 2461 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 38,377 psi | 64% | 2454 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 44,802 psi | 74% | 2530 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,515 psi | 81% | 2572 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,211 psi | 49% | 2224 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,802 psi | 74% | 2552 fps | 100% |
| Hodgdon Superformance | 41.7 gr | 86% | 40,350 psi | 67% | 2516 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 44% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,514 psi | 77% | 2526 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 48,515 psi | 81% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,975 psi | 71% | 2457 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,455 psi | 76% | 2480 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 41,524 psi | 69% | 2457 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,393 psi | 67% | 2411 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 30,632 psi | 51% | 2267 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 44,759 psi | 74% | 2533 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 50,096 psi | 83% | 2562 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,703 psi | 79% | 2539 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,805 psi | 79% | 2497 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,120 psi | 72% | 2461 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,520 psi | 59% | 2316 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 38,159 psi | 63% | 2395 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 35,099 psi | 58% | 2375 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 47,224 psi | 78% | 2516 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,718 psi | 79% | 2520 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,033 psi | 71% | 2497 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 47,007 psi | 78% | 2595 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 38,798 psi | 64% | 2536 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 31,705 psi | 53% | 2303 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 42,815 psi | 71% | 2513 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 35,346 psi | 59% | 2395 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,183 psi | 83% | 2582 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,748 psi | 83% | 2595 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 45% | 1476 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,495 psi | 69% | 2441 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,630 psi | 77% | 2612 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,507 psi | 62% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,212 psi | 52% | 2320 fps | 95.4% |
| ReloadSwiss RS 70 | 38.2 gr | 82% | 33,141 psi | 55% | 2372 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 51,285 psi | 85% | 2543 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,991 psi | 75% | 2470 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,189 psi | 63% | 2402 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 96% | 44,077 psi | 73% | 2569 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 41,321 psi | 69% | 2431 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,520 psi | 59% | 2316 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,703 psi | 79% | 2539 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,120 psi | 72% | 2461 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 38,159 psi | 63% | 2395 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,320 psi | 65% | 2454 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,704 psi | 81% | 2562 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,644 psi | 77% | 2536 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,196 psi | 80% | 2457 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,364 psi | 67% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,494 psi | 66% | 2362 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 43,671 psi | 73% | 2562 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,051 psi | 80% | 2461 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,341 psi | 80% | 2552 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,073 psi | 65% | 2408 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 28,471 psi | 47% | 2260 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 42,047 psi | 70% | 2503 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 48,631 psi | 81% | 2444 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,570 psi | 74% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,904 psi | 75% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,970 psi | 61% | 2343 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 33,069 psi | 55% | 2306 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 80% | 50,386 psi | 84% | 2559 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,439 psi | 72% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,677 psi | 54% | 2310 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 28,036 psi | 47% | 2260 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,750 psi | 54% | 2283 fps | 98.3% |
| Winchester 748 | <<locked>> | 80% | 50,604 psi | 84% | 2608 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 38,682 psi | 64% | 2461 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,005 psi | 43% | 2257 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,108 psi | 77% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 44,802 psi | 74% | 2543 fps | 95.1% |
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 114 powders for .260 Rem. loaded with the .264 | 140gr | Sierra MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,776 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.264" calls for a 1:9.5 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, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .260 Rem. with the .264 | 140gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.