Load Specifications
Load data in caliber .260 Rem. with .264 | 120gr | Frontier BTSP 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.
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>> | 84% | 52,083 psi | 87% | 2713 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,809 psi | 89% | 2785 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,476 psi | 89% | 2779 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 51,822 psi | 86% | 2792 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,113 psi | 88% | 2766 fps | 95.9% |
| Accurate 4064 | <<locked>> | 92% | 53,606 psi | 89% | 2825 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,852 psi | 88% | 2897 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 88% | 54,404 psi | 90% | 2854 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 52,272 psi | 87% | 2805 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,417 psi | 89% | 2805 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,809 psi | 89% | 2785 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,780 psi | 89% | 2966 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 51,851 psi | 86% | 2825 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,504 psi | 87% | 2844 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,300 psi | 85% | 2900 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,170 psi | 87% | 2940 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,260 psi | 60% | 2621 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,234 psi | 67% | 2766 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,143 psi | 90% | 2871 fps | 99.3% |
| Bofors RP3 | <<locked>> | 92% | 52,243 psi | 87% | 2841 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,678 psi | 88% | 2802 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,098 psi | 87% | 2743 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,765 psi | 88% | 2841 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,215 psi | 90% | 2930 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 54,215 psi | 90% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,316 psi | 89% | 2848 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 98% | 52,243 psi | 87% | 2887 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 51,430 psi | 85% | 2812 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,398 psi | 79% | 2779 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,998 psi | 90% | 2897 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,272 psi | 89% | 2920 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,027 psi | 58% | 1726 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 52,895 psi | 88% | 2818 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 51,256 psi | 85% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,488 psi | 86% | 2782 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,953 psi | 86% | 2762 fps | 96.6% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,388 psi | 87% | 2818 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 51,329 psi | 85% | 2782 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,980 psi | 83% | 2831 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 53,824 psi | 89% | 2877 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,417 psi | 89% | 2805 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,635 psi | 89% | 2795 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,027 psi | 90% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,375 psi | 90% | 2785 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,375 psi | 90% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,679 psi | 89% | 2828 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,360 psi | 90% | 2858 fps | 97.3% |
| Norma 201 | <<locked>> | 88% | 53,301 psi | 89% | 2805 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,693 psi | 89% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,735 psi | 86% | 2835 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 51,982 psi | 86% | 2881 fps | 99% |
| Ramshot Big Game | <<locked>> | 90% | 51,880 psi | 86% | 2854 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,039 psi | 85% | 2874 fps | 97.4% |
| Ramshot TAC | <<locked>> | 86% | 53,693 psi | 89% | 2822 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,330 psi | 89% | 2841 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,462 psi | 90% | 2808 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,505 psi | 59% | 1768 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,011 psi | 88% | 2789 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,621 psi | 89% | 2828 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,301 psi | 87% | 2904 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,011 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,170 psi | 87% | 2910 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,692 psi | 88% | 2940 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 86% | 54,346 psi | 90% | 2789 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,795 psi | 89% | 2802 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,721 psi | 86% | 2825 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 52,678 psi | 88% | 2802 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,679 psi | 89% | 2828 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,027 psi | 90% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,375 psi | 90% | 2831 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,360 psi | 90% | 2858 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,563 psi | 89% | 2887 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 51,938 psi | 86% | 2795 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 52,649 psi | 87% | 2825 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,634 psi | 86% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,706 psi | 86% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,099 psi | 90% | 2779 fps | 97% |
| Somchem S321 | <<locked>> | 82% | 51,184 psi | 85% | 2789 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,259 psi | 90% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,793 psi | 86% | 2795 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 52,417 psi | 87% | 2828 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,340 psi | 77% | 2828 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 51,619 psi | 86% | 2667 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,793 psi | 86% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 52,881 psi | 88% | 2766 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,954 psi | 90% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,809 psi | 89% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 51,169 psi | 85% | 2825 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 53,838 psi | 89% | 2805 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,315 psi | 87% | 2782 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,606 psi | 89% | 2884 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,059 psi | 65% | 2700 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 51,692 psi | 86% | 2808 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 53,722 psi | 89% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,663 psi | 87% | 2894 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,663 psi | 87% | 2835 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% | 45,832 psi | 76% | 2621 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,343 psi | 84% | 2736 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,638 psi | 64% | 2543 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,295 psi | 75% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,748 psi | 83% | 2710 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 36,506 psi | 61% | 2533 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,751 psi | 58% | 2552 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 42,177 psi | 70% | 2641 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,926 psi | 60% | 2490 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,193 psi | 73% | 2654 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 44,150 psi | 73% | 2648 fps | 100% |
| Alliant Power Pro 2000-MR | 36.8 gr | 80% | 38,276 psi | 64% | 2661 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,462 psi | 59% | 2516 fps | 97.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,985 psi | 63% | 2572 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,360 psi | 59% | 2566 fps | 95.1% |
| Alliant Reloder-17 | 37.1 gr | 82% | 32,561 psi | 54% | 2523 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,082 psi | 53% | 2513 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,579 psi | 62% | 2703 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,437 psi | 69% | 2644 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 34,853 psi | 58% | 2513 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 49,313 psi | 82% | 2746 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,137 psi | 77% | 2648 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,931 psi | 71% | 2674 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,369 psi | 79% | 2815 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 80% | 50,662 psi | 84% | 2753 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,377 psi | 64% | 2572 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 45,701 psi | 76% | 2772 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 42,540 psi | 71% | 2654 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,327 psi | 50% | 2408 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,566 psi | 64% | 2621 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 49,806 psi | 83% | 2861 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,872 psi | 68% | 2605 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 42,148 psi | 70% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,695 psi | 63% | 2526 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,658 psi | 76% | 2651 fps | 95.1% |
| IMR 4350 | <<locked>> | 98% | 49,414 psi | 82% | 2772 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,153 psi | 80% | 2726 fps | 95.6% |
| IMR 4831 | <<locked>> | 90% | 36,027 psi | 60% | 2566 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 38,870 psi | 65% | 2605 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,193 psi | 73% | 2654 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 50,227 psi | 83% | 2743 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,147 psi | 68% | 2625 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 42,598 psi | 71% | 2585 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 37,623 psi | 63% | 2533 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 41,974 psi | 70% | 2621 fps | 95.7% |
| Lovex S070 | <<locked>> | 94% | 44,962 psi | 75% | 2697 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 41,510 psi | 69% | 2598 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 41,727 psi | 69% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,347 psi | 62% | 2562 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 35,317 psi | 59% | 2559 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 36,898 psi | 61% | 2575 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 41,959 psi | 70% | 2703 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 44,135 psi | 73% | 2651 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,598 psi | 72% | 2677 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,008 psi | 80% | 2703 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,571 psi | 44% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,661 psi | 83% | 2740 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,121 psi | 73% | 2661 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,740 psi | 66% | 2674 fps | 97.3% |
| ReloadSwiss RS 60 | 36.2 gr | 80% | 32,445 psi | 54% | 2536 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,043 psi | 62% | 2625 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,132 psi | 67% | 2694 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,324 psi | 75% | 2644 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,465 psi | 66% | 2549 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,909 psi | 55% | 2461 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 49,313 psi | 82% | 2746 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,974 psi | 70% | 2621 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,147 psi | 68% | 2625 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 37,623 psi | 63% | 2533 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 44,962 psi | 75% | 2697 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,924 psi | 56% | 2507 fps | 95.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,540 psi | 71% | 2628 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,886 psi | 68% | 2615 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,062 psi | 72% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,665 psi | 59% | 2428 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,500 psi | 79% | 2674 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 47,950 psi | 80% | 2736 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,511 psi | 71% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,192 psi | 70% | 2628 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 33,837 psi | 56% | 2470 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 27,818 psi | 46% | 2395 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,660 psi | 81% | 2625 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,308 psi | 72% | 2559 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,827 psi | 65% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,552 psi | 66% | 2549 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,184 psi | 53% | 2408 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 36,970 psi | 61% | 2562 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,324 psi | 74% | 2651 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 38,000 psi | 63% | 2536 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 36,201 psi | 60% | 2559 fps | 95% |
| Vihtavuori N555 | <<locked>> | 96% | 34,301 psi | 57% | 2589 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,560 psi | 51% | 2379 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 43,918 psi | 73% | 2697 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 46,050 psi | 77% | 2779 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,103 psi | 67% | 2615 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 | 120gr | Frontier BTSP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,966 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,966 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 120.0 gr projectile in 0.264" calls for a 1:8.5 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 | 120gr | Frontier BTSP 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.