Load Specifications
Load data in caliber .260 Rem. with .264 | 139gr | Norma VULKAN 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 2495 | <<locked>> | 84% | 52,301 psi | 87% | 2572 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,041 psi | 90% | 2628 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,166 psi | 77% | 2598 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 52,576 psi | 87% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,185 psi | 87% | 2707 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 52,141 psi | 87% | 2644 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,417 psi | 89% | 2651 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,795 psi | 89% | 2743 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,331 psi | 90% | 2641 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,793 psi | 86% | 2759 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,664 psi | 89% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,853 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,330 psi | 89% | 2762 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 50,807 psi | 84% | 2740 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,634 psi | 87% | 2730 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,311 psi | 77% | 2671 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,845 psi | 73% | 2628 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,450 psi | 64% | 2536 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,342 psi | 82% | 2795 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 51,706 psi | 86% | 2657 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,360 psi | 90% | 2687 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,311 psi | 77% | 2671 fps | 96.1% |
| Bofors RP7 | <<locked>> | 92% | 54,128 psi | 90% | 2667 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,853 psi | 89% | 2671 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,561 psi | 86% | 2651 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 51,343 psi | 85% | 2703 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 90% | 51,938 psi | 86% | 2671 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 52,663 psi | 87% | 2651 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,388 psi | 89% | 2690 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,330 psi | 87% | 2687 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 51,155 psi | 85% | 2733 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 60% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,795 psi | 89% | 2654 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,156 psi | 88% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,837 psi | 88% | 2635 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,344 psi | 87% | 2615 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 51,184 psi | 85% | 2644 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,301 psi | 87% | 2641 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 53,055 psi | 88% | 2703 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 51,909 psi | 86% | 2667 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,331 psi | 90% | 2641 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,315 psi | 87% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 51,503 psi | 86% | 2575 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,910 psi | 88% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,069 psi | 87% | 2638 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 53,229 psi | 88% | 2677 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,522 psi | 64% | 2461 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 54,302 psi | 90% | 2638 fps | 100% |
| Norma 202 | <<locked>> | 82% | 51,547 psi | 86% | 2592 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,142 psi | 88% | 2677 fps | 100% |
| Norma 204 | <<locked>> | 94% | 51,416 psi | 85% | 2687 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 48,950 psi | 81% | 2753 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 51,503 psi | 86% | 2700 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 53,882 psi | 90% | 2703 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,374 psi | 89% | 2746 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 54,389 psi | 90% | 2664 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,666 psi | 61% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,634 psi | 86% | 2635 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 50,908 psi | 85% | 2700 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,114 psi | 90% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 52,127 psi | 87% | 2733 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 51,053 psi | 85% | 2756 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 84% | 51,779 psi | 86% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,259 psi | 90% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 52,112 psi | 87% | 2664 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,721 psi | 86% | 2717 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 54,128 psi | 90% | 2667 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,069 psi | 87% | 2638 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,315 psi | 87% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,910 psi | 88% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,229 psi | 88% | 2677 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,199 psi | 87% | 2687 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,055 psi | 88% | 2644 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,143 psi | 90% | 2667 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,185 psi | 87% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,794 psi | 88% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 51,938 psi | 86% | 2595 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,227 psi | 85% | 2710 fps | 97.2% |
| Somchem S335 | <<locked>> | 82% | 51,779 psi | 86% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,634 psi | 87% | 2635 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 51,242 psi | 85% | 2631 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,258 psi | 88% | 2746 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,344 psi | 87% | 2697 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 52,576 psi | 87% | 2516 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,793 psi | 86% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,054 psi | 86% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,330 psi | 87% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,505 psi | 89% | 2690 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,049 psi | 75% | 2562 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 86% | 53,693 psi | 89% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,910 psi | 88% | 2700 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,820 psi | 81% | 2700 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,592 psi | 89% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 51,706 psi | 86% | 2710 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,204 psi | 65% | 2657 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,983 psi | 90% | 2677 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,298 psi | 82% | 2638 fps | 96.4% |
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% | 45,861 psi | 76% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,527 psi | 74% | 2474 fps | 96.2% |
| Accurate 3100 | <<locked>> | 92% | 35,186 psi | 58% | 2392 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 43,381 psi | 72% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,329 psi | 54% | 2336 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 80% | 48,979 psi | 81% | 2595 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,800 psi | 69% | 2461 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 44,338 psi | 74% | 2579 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,039 psi | 85% | 2592 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,165 psi | 75% | 2648 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,597 psi | 69% | 2477 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,570 psi | 74% | 2539 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,445 psi | 54% | 2352 fps | 96.5% |
| Alliant Reloder-17 | 37.8 gr | 80% | 36,245 psi | 60% | 2470 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 43,555 psi | 72% | 2572 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 43,410 psi | 72% | 2615 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,614 psi | 44% | 2218 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,982 psi | 56% | 2428 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,343 psi | 54% | 2434 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,588 psi | 81% | 2608 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 41,597 psi | 69% | 2487 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 43,410 psi | 72% | 2615 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 39,494 psi | 66% | 2411 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,560 psi | 84% | 2625 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,235 psi | 70% | 2493 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 39,407 psi | 65% | 2490 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 84% | 42,714 psi | 71% | 2510 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,472 psi | 82% | 2602 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,965 psi | 50% | 2260 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,701 psi | 76% | 2585 fps | 100% |
| Hodgdon Superformance | 42.9 gr | 86% | 41,350 psi | 69% | 2556 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 44% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,427 psi | 79% | 2559 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,705 psi | 83% | 2585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,918 psi | 73% | 2490 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,267 psi | 77% | 2513 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 39,885 psi | 66% | 2444 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,653 psi | 64% | 2395 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,444 psi | 52% | 2300 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 45,701 psi | 76% | 2569 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 51,039 psi | 85% | 2592 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,689 psi | 81% | 2572 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,399 psi | 80% | 2526 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 43,787 psi | 73% | 2487 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,056 psi | 60% | 2346 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 36,550 psi | 61% | 2375 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 33,881 psi | 56% | 2362 fps | 95% |
| Norma 201 | <<locked>> | 80% | 47,877 psi | 80% | 2543 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,341 psi | 80% | 2546 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,947 psi | 73% | 2530 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 45,165 psi | 75% | 2582 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 40,074 psi | 67% | 2579 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 32,532 psi | 54% | 2336 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 43,947 psi | 73% | 2549 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 36,245 psi | 60% | 2431 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 50,894 psi | 85% | 2612 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 45% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,540 psi | 71% | 2477 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,630 psi | 79% | 2648 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,537 psi | 64% | 2526 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,155 psi | 53% | 2356 fps | 95.9% |
| ReloadSwiss RS 70 | 39.3 gr | 82% | 33,939 psi | 56% | 2408 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 45,658 psi | 76% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,131 psi | 65% | 2434 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 48,892 psi | 81% | 2612 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 42,409 psi | 70% | 2556 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 39,494 psi | 66% | 2411 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,056 psi | 60% | 2346 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,689 psi | 81% | 2572 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,787 psi | 73% | 2487 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 36,550 psi | 61% | 2375 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,161 psi | 67% | 2484 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,806 psi | 83% | 2595 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,500 psi | 79% | 2569 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,240 psi | 82% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,307 psi | 69% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,666 psi | 63% | 2343 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,831 psi | 74% | 2605 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 48,675 psi | 81% | 2487 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,429 psi | 82% | 2585 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,697 psi | 66% | 2438 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,196 psi | 49% | 2297 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 40,480 psi | 67% | 2490 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 49,690 psi | 83% | 2477 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,716 psi | 76% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,847 psi | 76% | 2484 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,840 psi | 63% | 2375 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,881 psi | 56% | 2339 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 42,250 psi | 70% | 2513 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 44,266 psi | 74% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,446 psi | 56% | 2339 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 28,819 psi | 48% | 2293 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,547 psi | 56% | 2320 fps | 98.6% |
| Winchester 760 | <<locked>> | 84% | 39,697 psi | 66% | 2497 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,600 psi | 44% | 2293 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,268 psi | 79% | 2575 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 45,745 psi | 76% | 2579 fps | 95.5% |
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 | 139gr | Norma VULKAN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,795 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 60–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.264" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 | 139gr | Norma VULKAN 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.