Load Specifications
Load data in caliber 6.5 PRC with .264 | 120gr | Frontier BTSP 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, Alliant Reloder-26 and Hodgdon Superformance.
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 2495 | <<locked>> | 82% | 55,869 psi | 86% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,363 psi | 90% | 2976 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,259 psi | 85% | 3015 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,260 psi | 87% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,217 psi | 88% | 3064 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 58,450 psi | 90% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,318 psi | 87% | 2989 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 58,421 psi | 90% | 3114 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,825 psi | 86% | 3100 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,753 psi | 86% | 3114 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,101 psi | 88% | 3009 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,450 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,972 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,579 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,624 psi | 89% | 3100 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 3097 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,982 psi | 80% | 3031 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,078 psi | 69% | 2949 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,985 psi | 86% | 3179 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,314 psi | 77% | 3018 fps | 97.2% |
| Bofors RP3 | <<locked>> | 86% | 58,030 psi | 89% | 3028 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 3097 fps | 98.2% |
| Bofors RP7 | <<locked>> | 90% | 57,203 psi | 88% | 3012 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 58,595 psi | 90% | 3048 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,884 psi | 88% | 3081 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 92% | 57,276 psi | 88% | 3051 fps | 98.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3087 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 58,233 psi | 90% | 3041 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,362 psi | 87% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,106 psi | 68% | 2976 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 90% | 56,130 psi | 86% | 3100 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 56% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,753 psi | 86% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,595 psi | 90% | 2995 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,697 psi | 90% | 3015 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,276 psi | 88% | 2989 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 58,479 psi | 90% | 3048 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,608 psi | 86% | 2989 fps | 99.1% |
| IMR 4831 | <<locked>> | 98% | 58,523 psi | 90% | 3068 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,172 psi | 85% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,653 psi | 89% | 3035 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,696 psi | 89% | 3146 fps | 97.5% |
| Lovex S060 | <<locked>> | 82% | 57,261 psi | 88% | 2953 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,086 psi | 86% | 2966 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,695 psi | 86% | 2982 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,145 psi | 88% | 3028 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,832 psi | 71% | 2854 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 57,203 psi | 88% | 2972 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,088 psi | 89% | 2969 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,739 psi | 87% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,840 psi | 86% | 3048 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 58,581 psi | 90% | 3189 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 55,941 psi | 86% | 3051 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,624 psi | 89% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,537 psi | 89% | 3153 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 94% | 58,320 psi | 90% | 3104 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,114 psi | 83% | 3064 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,086 psi | 57% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 58,421 psi | 90% | 3031 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,984 psi | 85% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,421 psi | 88% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,782 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,280 psi | 68% | 2976 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 57,754 psi | 89% | 2972 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 58,204 psi | 90% | 3025 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,086 psi | 86% | 3018 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 56,652 psi | 87% | 3081 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 57,203 psi | 88% | 3012 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,695 psi | 86% | 2982 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,086 psi | 86% | 2966 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,145 psi | 88% | 3028 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,101 psi | 86% | 3031 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,159 psi | 88% | 3005 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,943 psi | 89% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,361 psi | 85% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,288 psi | 85% | 2933 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,159 psi | 86% | 3074 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 57,595 psi | 89% | 2894 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,175 psi | 90% | 3022 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 58,189 psi | 90% | 3015 fps | 96.8% |
| Somchem S365 | <<locked>> | 94% | 55,332 psi | 85% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,595 psi | 89% | 3058 fps | 99.1% |
| Unknown powder | <<locked>> | 90% | 56,420 psi | 87% | 3054 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 57,986 psi | 89% | 2874 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 58,465 psi | 90% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,696 psi | 89% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,260 psi | 87% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,043 psi | 88% | 3025 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,314 psi | 79% | 2943 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 57,551 psi | 89% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,290 psi | 88% | 3071 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,044 psi | 89% | 3110 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 3120 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,711 psi | 89% | 3005 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,884 psi | 88% | 3081 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,050 psi | 72% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,738 psi | 86% | 3022 fps | 98.1% |
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% | 52,446 psi | 81% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,078 psi | 69% | 2749 fps | 96.7% |
| Accurate 3100 | <<locked>> | 86% | 34,229 psi | 53% | 2605 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 49,690 psi | 76% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,985 psi | 58% | 2713 fps | 98.1% |
| ADI AR 2206H | <<locked>> | 80% | 55,056 psi | 85% | 2979 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,601 psi | 72% | 2822 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,744 psi | 69% | 2867 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 48,791 psi | 75% | 2972 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,982 psi | 80% | 3051 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,210 psi | 73% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,575 psi | 78% | 2927 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,912 psi | 57% | 2723 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,858 psi | 64% | 2851 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,425 psi | 68% | 2861 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,945 psi | 65% | 2851 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,122 psi | 42% | 2461 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,750 psi | 50% | 2641 fps | 95% |
| Alliant Reloder-26 | 50.3 gr | 82% | 30,966 psi | 48% | 2635 fps | 95.1% |
| Bofors RP15 | <<locked>> | 96% | 44,034 psi | 68% | 2894 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,747 psi | 73% | 2864 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,945 psi | 65% | 2851 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,814 psi | 64% | 2726 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 48,095 psi | 74% | 2877 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 43,294 psi | 67% | 2835 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 82% | 41,858 psi | 64% | 2762 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,242 psi | 79% | 2963 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,447 psi | 53% | 2612 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,472 psi | 76% | 2923 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,408 psi | 64% | 2910 fps | 95.3% |
| Hodgdon Superformance | 50.7 gr | 80% | 38,972 psi | 60% | 2766 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 42% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,298 psi | 76% | 2871 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,822 psi | 80% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,050 psi | 71% | 2805 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,918 psi | 69% | 2769 fps | 97.4% |
| IMR 4350 | <<locked>> | 82% | 40,118 psi | 62% | 2707 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,207 psi | 66% | 2759 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 33,011 psi | 51% | 2575 fps | 96.7% |
| IMR 4895 | <<locked>> | 80% | 51,837 psi | 80% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,807 psi | 78% | 2920 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 50,111 psi | 77% | 3012 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 53,650 psi | 83% | 2900 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,298 psi | 76% | 2858 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,857 psi | 63% | 2710 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 39,131 psi | 60% | 2687 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 35,491 psi | 55% | 2635 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 53,795 psi | 83% | 2923 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,317 psi | 84% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,908 psi | 77% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,382 psi | 70% | 2858 fps | 95.7% |
| Norma MRP | <<locked>> | 88% | 38,392 psi | 59% | 2799 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 37,753 psi | 58% | 2707 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 50,372 psi | 78% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 49,647 psi | 76% | 3015 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 36,637 psi | 56% | 2690 fps | 96% |
| Ramshot Magnum | <<locked>> | 92% | 39,856 psi | 61% | 2785 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,950 psi | 74% | 2854 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,483 psi | 68% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,797 psi | 58% | 2730 fps | 97.8% |
| ReloadSwiss RS 70 | 48.7 gr | 80% | 36,666 psi | 56% | 2733 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,363 psi | 59% | 2828 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,097 psi | 79% | 2871 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,933 psi | 69% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,516 psi | 76% | 2907 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 90% | 43,511 psi | 67% | 2841 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,814 psi | 64% | 2726 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,857 psi | 63% | 2710 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 49,298 psi | 76% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,131 psi | 60% | 2687 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,122 psi | 71% | 2864 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,548 psi | 82% | 2949 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,433 psi | 84% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,064 psi | 71% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,045 psi | 62% | 2651 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,120 psi | 66% | 2835 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,288 psi | 84% | 2848 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,208 psi | 70% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,039 psi | 79% | 2897 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 34,098 psi | 52% | 2661 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 38,667 psi | 60% | 2703 fps | 95% |
| Unknown powder | <<locked>> | 80% | 40,640 psi | 63% | 2762 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 80% | 51,474 psi | 79% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,517 psi | 79% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,010 psi | 79% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,740 psi | 60% | 2648 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 40,654 psi | 63% | 2736 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 94% | 42,090 psi | 65% | 2769 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 50,705 psi | 78% | 2864 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,350 psi | 64% | 2782 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,892 psi | 46% | 2543 fps | 96% |
| Vihtavuori N560 | <<locked>> | 98% | 51,634 psi | 79% | 3061 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,348 psi | 59% | 2677 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 43,294 psi | 67% | 2835 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,628 psi | 39% | 2490 fps | 95.4% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,918 psi | 69% | 2831 fps | 95.8% |
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 6.5 PRC loaded with the .264 | 120gr | Frontier BTSP. Norma MRP delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,189 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 (448 MPa), the top charges use 56–90 %, 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 3100, ADI AR 2213, Alliant Reloder-22 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, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for 6.5 PRC 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.