Load Specifications
Load data in caliber 6.5 PRC with .264 | 153gr | Sierra Tipped MatchKing bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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>> | 82% | 57,246 psi | 88% | 2526 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,146 psi | 89% | 2608 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 2661 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,856 psi | 89% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,668 psi | 90% | 2697 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 58,523 psi | 90% | 2802 fps | 98% |
| ADI AR 2208 | <<locked>> | 86% | 57,464 psi | 88% | 2615 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,637 psi | 86% | 2694 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,913 psi | 88% | 2746 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,506 psi | 56% | 2434 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,246 psi | 88% | 2736 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,276 psi | 90% | 2635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,479 psi | 90% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,825 psi | 86% | 2700 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,116 psi | 88% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,552 psi | 90% | 2733 fps | 99.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,956 psi | 86% | 2743 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,939 psi | 81% | 2667 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,919 psi | 71% | 2615 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,159 psi | 88% | 2808 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,503 psi | 79% | 2674 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 55,825 psi | 86% | 2605 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,974 psi | 65% | 2546 fps | 96.2% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,956 psi | 86% | 2743 fps | 99.4% |
| Bofors RP7 | <<locked>> | 90% | 58,320 psi | 90% | 2648 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,774 psi | 70% | 2562 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,927 psi | 86% | 2625 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,985 psi | 88% | 2697 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 56,405 psi | 87% | 2657 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 56,942 psi | 88% | 2690 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,796 psi | 86% | 2674 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,956 psi | 86% | 2625 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,232 psi | 88% | 2651 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,947 psi | 69% | 2654 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 90% | 57,319 psi | 88% | 2740 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,653 psi | 89% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,739 psi | 87% | 2595 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,014 psi | 86% | 2589 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,130 psi | 86% | 2635 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,710 psi | 87% | 2625 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 55,172 psi | 85% | 2638 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,608 psi | 87% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,682 psi | 90% | 2680 fps | 98.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2723 fps | 98.3% |
| Lovex S060 | <<locked>> | 82% | 58,305 psi | 90% | 2579 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,058 psi | 88% | 2589 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,797 psi | 87% | 2621 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,073 psi | 89% | 2661 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,108 psi | 73% | 2526 fps | 99.6% |
| Norma 201 | <<locked>> | 82% | 58,421 psi | 90% | 2595 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,754 psi | 89% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,971 psi | 88% | 2687 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 55,738 psi | 86% | 2769 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 56,971 psi | 88% | 2680 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,172 psi | 85% | 2625 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,940 psi | 85% | 2743 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 55,956 psi | 86% | 2690 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,037 psi | 75% | 2625 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 57% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,912 psi | 86% | 2615 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,217 psi | 87% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 58,334 psi | 90% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,753 psi | 87% | 2749 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,049 psi | 69% | 2654 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 82% | 55,869 psi | 86% | 2556 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,086 psi | 86% | 2605 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,334 psi | 88% | 2667 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 58,189 psi | 90% | 2726 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 90% | 58,320 psi | 90% | 2648 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,797 psi | 87% | 2621 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,058 psi | 88% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,073 psi | 89% | 2661 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,522 psi | 89% | 2661 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,320 psi | 90% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,449 psi | 87% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,217 psi | 87% | 2575 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,696 psi | 89% | 2720 fps | 99.5% |
| Somchem S335 | <<locked>> | 82% | 58,740 psi | 90% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 55,753 psi | 86% | 2598 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,187 psi | 85% | 2608 fps | 97.6% |
| Somchem S365 | <<locked>> | 94% | 56,550 psi | 87% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,494 psi | 90% | 2694 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 56,130 psi | 86% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,115 psi | 86% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,956 psi | 88% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,463 psi | 85% | 2621 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,230 psi | 83% | 2628 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 84% | 57,769 psi | 89% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 58,334 psi | 90% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,680 psi | 86% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,985 psi | 86% | 2759 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 2621 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,158 psi | 85% | 2595 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,985 psi | 88% | 2697 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,544 psi | 75% | 2740 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,392 psi | 90% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,940 psi | 85% | 2644 fps | 99% |
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% | 53,867 psi | 83% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,140 psi | 79% | 2507 fps | 99% |
| Accurate 3100 | <<locked>> | 80% | 28,819 psi | 44% | 2162 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 51,097 psi | 79% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,102 psi | 60% | 2395 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 94% | 47,311 psi | 73% | 2628 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,921 psi | 74% | 2480 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,710 psi | 58% | 2379 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 43,714 psi | 67% | 2526 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 34,461 psi | 53% | 2385 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,113 psi | 82% | 2680 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,573 psi | 75% | 2500 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,692 psi | 80% | 2562 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,956 psi | 58% | 2405 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,091 psi | 66% | 2516 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,434 psi | 58% | 2375 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,594 psi | 58% | 2421 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,992 psi | 43% | 2192 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,660 psi | 46% | 2251 fps | 95.8% |
| Alliant Reloder-26 | 41.6 gr | 80% | 29,747 psi | 46% | 2297 fps | 96.9% |
| Bofors RP15 | <<locked>> | 90% | 37,362 psi | 57% | 2415 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,849 psi | 75% | 2510 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,189 psi | 60% | 2490 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 37,594 psi | 58% | 2421 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 42,946 psi | 66% | 2405 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 39,929 psi | 61% | 2448 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,066 psi | 76% | 2523 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,959 psi | 63% | 2438 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 43,787 psi | 67% | 2454 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 43,700 psi | 67% | 2477 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,803 psi | 70% | 2516 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,462 psi | 55% | 2303 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,606 psi | 83% | 2602 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,130 psi | 57% | 2480 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 39,784 psi | 61% | 2451 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 42% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,404 psi | 84% | 2569 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,415 psi | 78% | 2507 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,547 psi | 81% | 2539 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,551 psi | 59% | 2343 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,164 psi | 68% | 2428 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 37,666 psi | 58% | 2352 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 53,026 psi | 82% | 2589 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,844 psi | 66% | 2428 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 41,727 psi | 64% | 2503 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 55,042 psi | 85% | 2536 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,792 psi | 78% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,974 psi | 65% | 2388 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 40,176 psi | 62% | 2372 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 30,037 psi | 46% | 2192 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 55,129 psi | 85% | 2552 fps | 100% |
| Norma 203B | <<locked>> | 80% | 51,039 psi | 79% | 2549 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,043 psi | 59% | 2369 fps | 95.3% |
| Norma MRP | 42.4 gr | 84% | 34,403 psi | 53% | 2379 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 38,841 psi | 60% | 2388 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 51,416 psi | 79% | 2572 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,481 psi | 64% | 2510 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,652 psi | 58% | 2382 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 34,345 psi | 53% | 2343 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 43% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,226 psi | 76% | 2513 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,745 psi | 70% | 2556 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,957 psi | 60% | 2418 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,449 psi | 58% | 2425 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,098 psi | 52% | 2405 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 52,359 psi | 81% | 2510 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,180 psi | 71% | 2467 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,756 psi | 64% | 2411 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 36,550 psi | 56% | 2359 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,946 psi | 66% | 2405 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,974 psi | 65% | 2388 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 50,792 psi | 78% | 2503 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,176 psi | 62% | 2372 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,326 psi | 73% | 2516 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,766 psi | 84% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,152 psi | 73% | 2365 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,973 psi | 63% | 2336 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,216 psi | 56% | 2352 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 55,492 psi | 85% | 2484 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,441 psi | 71% | 2464 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,585 psi | 70% | 2457 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,331 psi | 54% | 2352 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,925 psi | 54% | 2297 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 52,837 psi | 81% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,910 psi | 81% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,295 psi | 68% | 2398 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,205 psi | 62% | 2385 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 36,709 psi | 56% | 2329 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,923 psi | 78% | 2484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,494 psi | 61% | 2388 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,864 psi | 48% | 2257 fps | 98.2% |
| Vihtavuori N560 | 45.4 gr | 90% | 42,540 psi | 65% | 2533 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 41,698 psi | 64% | 2513 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,276 psi | 60% | 2359 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,234 psi | 63% | 2444 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,700 psi | 38% | 2182 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,795 psi | 84% | 2589 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,550 psi | 56% | 2333 fps | 95% |
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 104 powders for 6.5 PRC loaded with the .264 | 153gr | Sierra Tipped MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,808 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 153.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for 6.5 PRC with the .264 | 153gr | Sierra Tipped MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 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.