Load Specifications
Load data in caliber .260 Rem. with .264 | 139gr | Norma FMJ Elektron bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-16.
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 2495 | <<locked>> | 86% | 54,056 psi | 90% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 52,823 psi | 88% | 2595 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,672 psi | 74% | 2566 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 54,389 psi | 90% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,027 psi | 90% | 2723 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 54,288 psi | 90% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,011 psi | 86% | 2618 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,069 psi | 87% | 2703 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,127 psi | 88% | 2615 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,201 psi | 90% | 2585 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,809 psi | 89% | 2782 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,156 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 52,388 psi | 87% | 2657 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 51,692 psi | 86% | 2726 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,533 psi | 87% | 2756 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,242 psi | 85% | 2697 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,221 psi | 70% | 2589 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,130 psi | 62% | 2493 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,688 psi | 79% | 2756 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,012 psi | 90% | 2680 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 52,431 psi | 87% | 2651 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 52,518 psi | 87% | 2631 fps | 97.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,388 psi | 87% | 2641 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,548 psi | 89% | 2671 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 53,127 psi | 88% | 2723 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 53,664 psi | 89% | 2684 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 51,459 psi | 85% | 2625 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 51,619 psi | 86% | 2657 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,259 psi | 90% | 2703 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,301 psi | 89% | 2756 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 60% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,678 psi | 88% | 2628 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,692 psi | 86% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 51,343 psi | 85% | 2598 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,375 psi | 90% | 2631 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 52,997 psi | 88% | 2661 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,418 psi | 90% | 2661 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 51,010 psi | 85% | 2667 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 53,751 psi | 89% | 2684 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,127 psi | 88% | 2615 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,128 psi | 90% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,679 psi | 89% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 51,387 psi | 85% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,143 psi | 90% | 2657 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 51,605 psi | 86% | 2641 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,057 psi | 62% | 2425 fps | 95.9% |
| Norma 201 | <<locked>> | 84% | 53,142 psi | 88% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,679 psi | 89% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 86% | 51,619 psi | 86% | 2644 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,403 psi | 89% | 2707 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 47,355 psi | 79% | 2710 fps | 97.5% |
| Norma URP | <<locked>> | 96% | 53,243 psi | 88% | 2713 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 52,127 psi | 87% | 2671 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 51,822 psi | 86% | 2713 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 53,127 psi | 88% | 2635 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,098 psi | 88% | 2654 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 60% | 1660 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,635 psi | 89% | 2654 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,084 psi | 88% | 2723 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,344 psi | 87% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,592 psi | 89% | 2746 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,084 psi | 88% | 2776 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 54,056 psi | 90% | 2589 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,592 psi | 89% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,721 psi | 88% | 2651 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 54,157 psi | 90% | 2680 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,806 psi | 83% | 2677 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 52,518 psi | 87% | 2631 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,143 psi | 90% | 2657 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,128 psi | 90% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,387 psi | 85% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 51,605 psi | 86% | 2641 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,244 psi | 90% | 2707 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 51,692 psi | 86% | 2615 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,721 psi | 88% | 2638 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,389 psi | 90% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 51,314 psi | 85% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,867 psi | 89% | 2608 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,327 psi | 82% | 2671 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 53,896 psi | 90% | 2549 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 51,285 psi | 85% | 2605 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 52,736 psi | 88% | 2644 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 51,416 psi | 85% | 2717 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,937 psi | 85% | 2664 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 82% | 51,300 psi | 85% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,505 psi | 89% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,954 psi | 90% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,998 psi | 90% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 51,851 psi | 86% | 2654 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 53,519 psi | 89% | 2612 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,344 psi | 87% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,346 psi | 90% | 2710 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,818 psi | 78% | 2661 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 51,880 psi | 86% | 2638 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,708 psi | 89% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,476 psi | 89% | 2730 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,855 psi | 63% | 2615 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,576 psi | 87% | 2644 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 2495 | <<locked>> | 80% | 44,802 psi | 74% | 2457 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,279 psi | 72% | 2438 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 36,230 psi | 60% | 2405 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 42,366 psi | 70% | 2461 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,227 psi | 52% | 2303 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,747 psi | 79% | 2566 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,727 psi | 68% | 2428 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 45,905 psi | 76% | 2598 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,821 psi | 83% | 2566 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,952 psi | 85% | 2543 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,772 psi | 73% | 2612 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,437 psi | 67% | 2448 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,410 psi | 72% | 2510 fps | 99.4% |
| Alliant Reloder-16 | 34.1 gr | 80% | 31,517 psi | 52% | 2316 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,012 psi | 58% | 2431 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 45,020 psi | 75% | 2589 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,412 psi | 46% | 2238 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,085 psi | 58% | 2444 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 33,605 psi | 56% | 2457 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,224 psi | 78% | 2575 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 40,408 psi | 67% | 2457 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 41,089 psi | 68% | 2431 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,066 psi | 82% | 2592 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,147 psi | 68% | 2464 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 38,145 psi | 63% | 2454 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 44,541 psi | 74% | 2533 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,254 psi | 80% | 2575 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,037 psi | 48% | 2224 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,527 psi | 74% | 2556 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 40,103 psi | 67% | 2520 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 44% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,282 psi | 77% | 2530 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,240 psi | 80% | 2559 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,743 psi | 71% | 2461 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,237 psi | 75% | 2484 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 41,292 psi | 69% | 2461 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,190 psi | 67% | 2415 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 30,429 psi | 51% | 2270 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 44,512 psi | 74% | 2536 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 49,821 psi | 83% | 2566 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,427 psi | 79% | 2546 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,587 psi | 79% | 2503 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 42,888 psi | 71% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,331 psi | 59% | 2320 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 37,942 psi | 63% | 2395 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 34,838 psi | 58% | 2375 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 46,978 psi | 78% | 2520 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,108 psi | 78% | 2516 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,786 psi | 71% | 2500 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 46,717 psi | 78% | 2598 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 41,466 psi | 69% | 2598 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 31,502 psi | 52% | 2303 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 42,554 psi | 71% | 2516 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 35,128 psi | 58% | 2398 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,937 psi | 83% | 2585 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,487 psi | 82% | 2598 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 45% | 1483 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,263 psi | 69% | 2444 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,354 psi | 77% | 2618 fps | 99.7% |
| ReloadSwiss RS 60 | 36.7 gr | 80% | 37,260 psi | 62% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,995 psi | 51% | 2320 fps | 95.1% |
| ReloadSwiss RS 70 | 38.2 gr | 82% | 32,953 psi | 55% | 2372 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 51,039 psi | 85% | 2546 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,759 psi | 74% | 2477 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,942 psi | 63% | 2405 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 50,705 psi | 84% | 2628 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 43,787 psi | 73% | 2569 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 41,089 psi | 68% | 2431 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,331 psi | 59% | 2320 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,427 psi | 79% | 2546 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,888 psi | 71% | 2464 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 37,942 psi | 63% | 2395 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,073 psi | 65% | 2454 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,443 psi | 80% | 2562 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,398 psi | 77% | 2539 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,979 psi | 80% | 2461 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,161 psi | 67% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,276 psi | 65% | 2365 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 43,381 psi | 72% | 2566 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 47,819 psi | 79% | 2467 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,080 psi | 80% | 2556 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 38,856 psi | 65% | 2411 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 28,282 psi | 47% | 2264 fps | 97.9% |
| Somchem S385 | <<locked>> | 94% | 41,727 psi | 69% | 2507 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 48,399 psi | 80% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,309 psi | 74% | 2448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,672 psi | 74% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,753 psi | 61% | 2346 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,866 psi | 55% | 2306 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 80% | 50,125 psi | 83% | 2566 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,207 psi | 72% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,474 psi | 54% | 2310 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 29,602 psi | 49% | 2306 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,576 psi | 54% | 2287 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 50,314 psi | 84% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 38,435 psi | 64% | 2461 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,514 psi | 46% | 2313 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,847 psi | 76% | 2543 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 114 powders for .260 Rem. loaded with the .264 | 139gr | Norma FMJ Elektron. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,782 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,782 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 139.0 gr projectile in 0.264" calls for a 1:10.0 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 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .260 Rem. with the .264 | 139gr | Norma FMJ Elektron 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.