Load Specifications
Load data in caliber .260 Rem. with .264 | 122gr | Lehigh Defense Controlled Chaos bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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>> | 84% | 51,822 psi | 86% | 2680 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,664 psi | 89% | 2753 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,301 psi | 89% | 2749 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 51,677 psi | 86% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,156 psi | 88% | 2740 fps | 96% |
| Accurate 4064 | <<locked>> | 92% | 53,098 psi | 88% | 2792 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,605 psi | 87% | 2864 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 88% | 54,317 psi | 90% | 2825 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 51,808 psi | 86% | 2769 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,272 psi | 89% | 2776 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,563 psi | 89% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,490 psi | 89% | 2933 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 51,401 psi | 85% | 2792 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,098 psi | 87% | 2812 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,053 psi | 85% | 2867 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 51,982 psi | 86% | 2907 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,332 psi | 60% | 2598 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,190 psi | 67% | 2743 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,838 psi | 89% | 2835 fps | 99.3% |
| Bofors RP3 | <<locked>> | 92% | 51,851 psi | 86% | 2805 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 52,344 psi | 87% | 2769 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 51,909 psi | 86% | 2713 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,344 psi | 87% | 2805 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,215 psi | 90% | 2900 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 53,940 psi | 90% | 2772 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 52,953 psi | 88% | 2815 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 98% | 52,040 psi | 86% | 2858 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 51,285 psi | 85% | 2782 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,108 psi | 78% | 2746 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,621 psi | 89% | 2864 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,272 psi | 89% | 2894 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,128 psi | 58% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 52,808 psi | 88% | 2789 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 54,317 psi | 90% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,387 psi | 85% | 2756 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,488 psi | 86% | 2726 fps | 96.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,170 psi | 87% | 2789 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,433 psi | 90% | 2805 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,719 psi | 83% | 2802 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 53,403 psi | 89% | 2841 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,272 psi | 89% | 2776 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,534 psi | 89% | 2766 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,606 psi | 89% | 2799 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,230 psi | 90% | 2756 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,273 psi | 90% | 2802 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,359 psi | 89% | 2795 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,099 psi | 90% | 2828 fps | 97.4% |
| Norma 201 | <<locked>> | 88% | 53,156 psi | 88% | 2772 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,548 psi | 89% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,271 psi | 85% | 2799 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 51,706 psi | 86% | 2851 fps | 99% |
| Ramshot Big Game | <<locked>> | 90% | 51,547 psi | 86% | 2822 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,952 psi | 85% | 2844 fps | 97.5% |
| Ramshot TAC | <<locked>> | 86% | 53,751 psi | 89% | 2792 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,953 psi | 88% | 2808 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,404 psi | 90% | 2779 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 59% | 1749 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 52,852 psi | 88% | 2759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,708 psi | 89% | 2802 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,228 psi | 87% | 2874 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 51,822 psi | 86% | 2910 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,040 psi | 86% | 2884 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,228 psi | 87% | 2904 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 86% | 54,099 psi | 90% | 2756 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,606 psi | 89% | 2769 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,721 psi | 86% | 2799 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 52,344 psi | 87% | 2769 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,359 psi | 89% | 2795 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,606 psi | 89% | 2799 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,273 psi | 90% | 2802 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,099 psi | 90% | 2828 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,301 psi | 89% | 2854 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 51,909 psi | 86% | 2769 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 52,634 psi | 87% | 2795 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,358 psi | 85% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,605 psi | 86% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,867 psi | 89% | 2749 fps | 97% |
| Somchem S321 | <<locked>> | 82% | 51,053 psi | 85% | 2759 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,114 psi | 90% | 2713 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,430 psi | 85% | 2762 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 52,417 psi | 87% | 2799 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,093 psi | 77% | 2799 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,418 psi | 90% | 2677 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,517 psi | 86% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,142 psi | 88% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,882 psi | 90% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,505 psi | 89% | 2776 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 50,908 psi | 85% | 2795 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 53,722 psi | 89% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,272 psi | 87% | 2753 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,432 psi | 89% | 2854 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,827 psi | 65% | 2667 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 51,619 psi | 86% | 2782 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 53,272 psi | 89% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,460 psi | 87% | 2861 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,286 psi | 87% | 2802 fps | 99.9% |
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% | 45,876 psi | 76% | 2595 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,154 psi | 83% | 2703 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,363 psi | 64% | 2513 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,092 psi | 75% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,777 psi | 83% | 2684 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,274 psi | 60% | 2503 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,679 psi | 58% | 2530 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 42,250 psi | 70% | 2615 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 35,940 psi | 60% | 2467 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,266 psi | 74% | 2628 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,135 psi | 73% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | 36.2 gr | 80% | 38,145 psi | 63% | 2631 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,244 psi | 59% | 2487 fps | 97.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,014 psi | 63% | 2549 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,259 psi | 59% | 2539 fps | 95.1% |
| Alliant Reloder-17 | 36.5 gr | 82% | 32,460 psi | 54% | 2500 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,097 psi | 53% | 2490 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,536 psi | 62% | 2677 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,321 psi | 69% | 2618 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 34,911 psi | 58% | 2490 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 49,298 psi | 82% | 2717 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,180 psi | 77% | 2621 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,757 psi | 71% | 2644 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,862 psi | 78% | 2779 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 80% | 50,357 psi | 84% | 2720 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,218 psi | 63% | 2543 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 45,803 psi | 76% | 2749 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 42,583 psi | 71% | 2628 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,211 psi | 50% | 2385 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,406 psi | 64% | 2595 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 49,371 psi | 82% | 2825 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 44% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,944 psi | 68% | 2582 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 41,800 psi | 69% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,710 psi | 63% | 2500 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,498 psi | 76% | 2625 fps | 95.1% |
| IMR 4350 | <<locked>> | 98% | 49,211 psi | 82% | 2740 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,109 psi | 80% | 2700 fps | 95.7% |
| IMR 4831 | <<locked>> | 90% | 35,969 psi | 60% | 2539 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,928 psi | 65% | 2579 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,266 psi | 74% | 2628 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 50,082 psi | 83% | 2713 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,959 psi | 68% | 2595 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,612 psi | 71% | 2559 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 37,652 psi | 63% | 2510 fps | 98.5% |
| Lovex S065 | <<locked>> | 88% | 39,479 psi | 66% | 2546 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 44,962 psi | 75% | 2671 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 41,205 psi | 68% | 2569 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 41,452 psi | 69% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,405 psi | 62% | 2539 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 35,230 psi | 59% | 2533 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 36,767 psi | 61% | 2546 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 41,727 psi | 69% | 2674 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 43,961 psi | 73% | 2625 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,453 psi | 72% | 2648 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,863 psi | 80% | 2674 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,542 psi | 44% | 1565 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,400 psi | 82% | 2707 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,077 psi | 73% | 2635 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,552 psi | 66% | 2644 fps | 97.4% |
| ReloadSwiss RS 60 | 35.6 gr | 80% | 32,300 psi | 54% | 2507 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,043 psi | 62% | 2602 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,943 psi | 66% | 2664 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,310 psi | 75% | 2618 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,465 psi | 66% | 2526 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,721 psi | 54% | 2431 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 49,298 psi | 82% | 2717 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,479 psi | 66% | 2546 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,959 psi | 68% | 2595 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,652 psi | 63% | 2510 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 44,962 psi | 75% | 2671 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,736 psi | 56% | 2480 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,409 psi | 70% | 2602 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,698 psi | 68% | 2585 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,743 psi | 71% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,360 psi | 59% | 2395 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,195 psi | 78% | 2644 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 47,805 psi | 79% | 2707 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,279 psi | 70% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,061 psi | 70% | 2602 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 33,576 psi | 56% | 2438 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 27,688 psi | 46% | 2372 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,283 psi | 80% | 2592 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,960 psi | 71% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,493 psi | 64% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,291 psi | 65% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,952 psi | 53% | 2379 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 36,854 psi | 61% | 2533 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,411 psi | 74% | 2625 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 37,768 psi | 63% | 2503 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,158 psi | 60% | 2533 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 34,272 psi | 57% | 2566 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,501 psi | 51% | 2352 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 43,700 psi | 73% | 2667 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 45,803 psi | 76% | 2749 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,914 psi | 66% | 2585 fps | 98.4% |
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 96 powders for .260 Rem. loaded with the .264 | 122gr | Lehigh Defense Controlled Chaos. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,933 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,933 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 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 122.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .260 Rem. with the .264 | 122gr | Lehigh Defense Controlled Chaos 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.