Load Specifications
Load data in caliber 6.5 PRC with .264 | 135gr | Peregrine Glider GRM bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand and Norma MRP.
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% | 56,927 psi | 88% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,028 psi | 86% | 2789 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,087 psi | 88% | 2884 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,595 psi | 89% | 2805 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,288 psi | 85% | 2874 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,289 psi | 87% | 2979 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 86% | 57,769 psi | 89% | 2844 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,449 psi | 87% | 2927 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,928 psi | 89% | 2982 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,898 psi | 57% | 2635 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,696 psi | 89% | 2972 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,711 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,332 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,405 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,928 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,811 psi | 86% | 2913 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,058 psi | 88% | 2976 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,925 psi | 83% | 2897 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,615 psi | 72% | 2835 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 58,320 psi | 90% | 3045 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2897 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 55,956 psi | 86% | 2831 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,058 psi | 88% | 2976 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 55,274 psi | 85% | 2825 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,333 psi | 87% | 2854 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,984 psi | 85% | 2890 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,419 psi | 85% | 2864 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,127 psi | 82% | 2848 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,884 psi | 88% | 2907 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,579 psi | 87% | 2851 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,204 psi | 90% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,658 psi | 70% | 2877 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 90% | 58,334 psi | 90% | 2972 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 56% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,363 psi | 88% | 2831 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,652 psi | 87% | 2795 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,768 psi | 87% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 58,697 psi | 90% | 2851 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,521 psi | 87% | 2861 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,971 psi | 88% | 2851 fps | 99.7% |
| IMR 4831 | <<locked>> | 96% | 56,521 psi | 87% | 2877 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,811 psi | 87% | 2864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,637 psi | 86% | 2851 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,448 psi | 85% | 2959 fps | 98.1% |
| Lovex S060 | <<locked>> | 82% | 58,653 psi | 90% | 2808 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,246 psi | 88% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,058 psi | 88% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,465 psi | 90% | 2890 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,239 psi | 73% | 2736 fps | 99.4% |
| Norma 201 | <<locked>> | 82% | 58,508 psi | 90% | 2825 fps | 100% |
| Norma 203B | <<locked>> | 84% | 58,262 psi | 90% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,421 psi | 88% | 2917 fps | 99% |
| Norma MRP | <<locked>> | 98% | 56,666 psi | 87% | 2999 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 57,551 psi | 89% | 2910 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,419 psi | 85% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,448 psi | 85% | 2969 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 92% | 56,420 psi | 87% | 2917 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,333 psi | 87% | 2949 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 57% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,043 psi | 86% | 2835 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,203 psi | 88% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,419 psi | 85% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,783 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,701 psi | 70% | 2871 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 55,811 psi | 86% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,159 psi | 86% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,870 psi | 89% | 2894 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 55,071 psi | 85% | 2900 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 55,274 psi | 85% | 2825 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,058 psi | 88% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,246 psi | 88% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,465 psi | 90% | 2890 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,812 psi | 89% | 2887 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,726 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,840 psi | 87% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,724 psi | 87% | 2802 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,421 psi | 90% | 2953 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 56,101 psi | 86% | 2825 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,173 psi | 86% | 2835 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 57,406 psi | 88% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,666 psi | 86% | 2874 fps | 99.5% |
| Unknown powder | <<locked>> | 90% | 58,305 psi | 90% | 2917 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 56,159 psi | 86% | 2684 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,159 psi | 86% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,709 psi | 86% | 2743 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,609 psi | 89% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 58,726 psi | 90% | 2884 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,026 psi | 82% | 2822 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 55,448 psi | 85% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,187 psi | 85% | 2874 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,159 psi | 86% | 2920 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,363 psi | 88% | 3002 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,515 psi | 75% | 2841 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,593 psi | 86% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,984 psi | 85% | 2890 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,748 psi | 77% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,885 psi | 89% | 2900 fps | 99.1% |
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% | 53,229 psi | 82% | 2697 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,035 psi | 71% | 2625 fps | 98% |
| Accurate 3100 | <<locked>> | 82% | 30,516 psi | 47% | 2382 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 50,531 psi | 78% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,972 psi | 60% | 2592 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 98% | 52,576 psi | 81% | 2917 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,935 psi | 74% | 2694 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,350 psi | 62% | 2635 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 92% | 43,918 psi | 68% | 2736 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,577 psi | 53% | 2572 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,896 psi | 83% | 2913 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,631 psi | 75% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,866 psi | 80% | 2785 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,855 psi | 58% | 2602 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,207 psi | 66% | 2723 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,205 psi | 62% | 2631 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,797 psi | 58% | 2621 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,586 psi | 42% | 2359 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,415 psi | 48% | 2480 fps | 95.9% |
| Alliant Reloder-26 | 47.3 gr | 80% | 29,617 psi | 46% | 2470 fps | 96% |
| Bofors RP15 | <<locked>> | 92% | 39,871 psi | 61% | 2664 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 49,008 psi | 75% | 2726 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 37,797 psi | 58% | 2621 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,902 psi | 66% | 2608 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,124 psi | 76% | 2740 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,585 psi | 69% | 2713 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 40,292 psi | 62% | 2589 fps | 96% |
| Hodgdon H4831 | <<locked>> | 96% | 46,702 psi | 72% | 2740 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,122 psi | 71% | 2726 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,563 psi | 55% | 2497 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,807 psi | 78% | 2782 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,434 psi | 58% | 2680 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 40,089 psi | 62% | 2657 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 42% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,720 psi | 78% | 2736 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,272 psi | 82% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,920 psi | 72% | 2667 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,035 psi | 71% | 2644 fps | 98.6% |
| IMR 4350 | <<locked>> | 80% | 38,421 psi | 59% | 2533 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,469 psi | 68% | 2641 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 33,852 psi | 52% | 2461 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 53,243 psi | 82% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,963 psi | 71% | 2687 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 45,223 psi | 70% | 2776 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 55,085 psi | 85% | 2759 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,618 psi | 78% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,655 psi | 64% | 2582 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 39,914 psi | 61% | 2566 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 31,908 psi | 49% | 2418 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 54,853 psi | 84% | 2772 fps | 100% |
| Norma 203B | <<locked>> | 80% | 51,227 psi | 79% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,872 psi | 63% | 2625 fps | 95.6% |
| Norma MRP | 48.2 gr | 84% | 34,447 psi | 53% | 2569 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,740 psi | 60% | 2585 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,953 psi | 80% | 2799 fps | 100% |
| Ramshot Grand | 53.2 gr | 90% | 44,019 psi | 68% | 2762 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,579 psi | 58% | 2575 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 90% | 38,145 psi | 59% | 2618 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,371 psi | 76% | 2730 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,977 psi | 71% | 2776 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,870 psi | 60% | 2612 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,710 psi | 58% | 2625 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,695 psi | 56% | 2661 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 52,286 psi | 80% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,992 psi | 71% | 2674 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,773 psi | 69% | 2674 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 39,160 psi | 60% | 2608 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,902 psi | 66% | 2608 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,655 psi | 64% | 2582 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 50,618 psi | 78% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,914 psi | 61% | 2566 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,355 psi | 73% | 2730 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,853 psi | 84% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,239 psi | 73% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,857 psi | 63% | 2533 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,798 psi | 60% | 2602 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 46,195 psi | 71% | 2671 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,658 psi | 70% | 2661 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,143 psi | 54% | 2539 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 37,246 psi | 57% | 2539 fps | 95.8% |
| Unknown powder | <<locked>> | 80% | 41,843 psi | 64% | 2644 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 80% | 52,924 psi | 81% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,866 psi | 81% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,228 psi | 80% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,653 psi | 61% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,887 psi | 64% | 2615 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 90% | 37,884 psi | 58% | 2546 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 52,040 psi | 80% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,279 psi | 65% | 2654 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,618 psi | 47% | 2431 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 94% | 46,630 psi | 72% | 2818 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 98% | 45,034 psi | 69% | 2776 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,218 psi | 60% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,585 psi | 69% | 2713 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,279 psi | 37% | 2329 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,176 psi | 62% | 2598 fps | 95.6% |
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 | 135gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,045 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 135.0 gr projectile in 0.264" calls for a 1:7.5 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, Ramshot Grand, Norma MRP rank at the top here: for 6.5 PRC with the .264 | 135gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, 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.