Load Specifications
Load data in caliber 6.5 x 64 Brenneke with .264 | 122gr | Peregrine VLR-5 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-16, ReloadSwiss RS 70 and Alliant Reloder-26.
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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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 55,927 psi | 90% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,317 psi | 87% | 2867 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2900 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 52,837 psi | 85% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,751 psi | 86% | 2956 fps | 99.9% |
| Accurate High Country | <<locked>> | 98% | 52,837 psi | 85% | 3038 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 55,782 psi | 89% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,635 psi | 86% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,288 psi | 89% | 3002 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,881 psi | 85% | 3009 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,347 psi | 89% | 2995 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,462 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,462 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,042 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,231 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,505 psi | 87% | 2986 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2982 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,573 psi | 78% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,322 psi | 68% | 2831 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,883 psi | 90% | 2953 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,210 psi | 76% | 2900 fps | 96% |
| Bofors RP3 | <<locked>> | 86% | 54,882 psi | 88% | 2923 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2982 fps | 97.3% |
| Bofors RP7 | <<locked>> | 90% | 54,592 psi | 88% | 2907 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 86% | 55,434 psi | 89% | 2943 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 56,333 psi | 90% | 3012 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 56,115 psi | 90% | 2969 fps | 98.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2979 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 56,391 psi | 90% | 2943 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,172 psi | 88% | 2943 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,127 psi | 85% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,562 psi | 84% | 2982 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 58% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,186 psi | 87% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,229 psi | 85% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,970 psi | 90% | 2907 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,622 psi | 89% | 2943 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,362 psi | 90% | 2940 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 54,520 psi | 87% | 2949 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,912 psi | 90% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,810 psi | 88% | 2927 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 82% | 56,231 psi | 90% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,766 psi | 88% | 2858 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,258 psi | 85% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,231 psi | 90% | 2933 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 54,186 psi | 87% | 2923 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,554 psi | 68% | 2740 fps | 97.5% |
| Norma 201 | <<locked>> | 82% | 54,578 psi | 88% | 2877 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,216 psi | 89% | 2874 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,751 psi | 86% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 92% | 52,620 psi | 84% | 2933 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3068 fps | 99% |
| Norma URP | <<locked>> | 94% | 56,260 psi | 90% | 2995 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,636 psi | 88% | 2946 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,347 psi | 89% | 2999 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,817 psi | 72% | 2835 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,564 psi | 89% | 2927 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,564 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,869 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,809 psi | 86% | 2979 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,275 psi | 90% | 3068 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,172 psi | 88% | 2877 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,085 psi | 88% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,272 psi | 85% | 2910 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 98% | 53,650 psi | 86% | 2972 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 54,592 psi | 88% | 2907 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,231 psi | 90% | 2933 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,231 psi | 90% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,258 psi | 85% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,186 psi | 87% | 2923 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,417 psi | 86% | 2930 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,418 psi | 87% | 2907 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,434 psi | 89% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,420 psi | 90% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,101 psi | 90% | 2884 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,185 psi | 85% | 2966 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 55,187 psi | 88% | 2808 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,216 psi | 89% | 2920 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,550 psi | 89% | 2999 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,302 psi | 87% | 2946 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 56,028 psi | 90% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,347 psi | 89% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,825 psi | 90% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,040 psi | 85% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,998 psi | 88% | 2940 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,082 psi | 80% | 2864 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 53,998 psi | 87% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,056 psi | 87% | 2943 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2999 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 3058 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,708 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,721 psi | 85% | 2953 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,540 psi | 70% | 2963 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,607 psi | 88% | 2913 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2943 fps | 97.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,081 psi | 79% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,456 psi | 76% | 2746 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 36,216 psi | 58% | 2602 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 46,499 psi | 75% | 2753 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,273 psi | 57% | 2598 fps | 97% |
| Accurate High Country | <<locked>> | 96% | 49,298 psi | 79% | 2976 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,605 psi | 84% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,614 psi | 72% | 2730 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 45,165 psi | 72% | 2818 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,081 psi | 79% | 2943 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,252 psi | 73% | 2818 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,701 psi | 72% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,080 psi | 77% | 2825 fps | 99.8% |
| Alliant Reloder-16 | 42.5 gr | 80% | 34,722 psi | 56% | 2612 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,349 psi | 63% | 2743 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,701 psi | 72% | 2808 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,049 psi | 72% | 2861 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,876 psi | 43% | 2405 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,722 psi | 56% | 2644 fps | 95.4% |
| Alliant Reloder-26 | 50.4 gr | 86% | 33,025 psi | 53% | 2641 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,417 psi | 84% | 2897 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 44,150 psi | 71% | 2838 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 44,788 psi | 72% | 2759 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 45,049 psi | 72% | 2861 fps | 95.6% |
| Bofors RP7 | <<locked>> | 82% | 42,264 psi | 68% | 2680 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 45,397 psi | 73% | 2769 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 40,103 psi | 64% | 2710 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 43,236 psi | 69% | 2733 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,011 psi | 83% | 2917 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 53,171 psi | 85% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,097 psi | 51% | 2500 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,719 psi | 80% | 2871 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,177 psi | 68% | 2782 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 43% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,734 psi | 81% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,920 psi | 75% | 2766 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,226 psi | 79% | 2792 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,451 psi | 65% | 2664 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,133 psi | 66% | 2657 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 34,055 psi | 55% | 2552 fps | 96.7% |
| IMR 4895 | <<locked>> | 80% | 49,313 psi | 79% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,372 psi | 82% | 2867 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 80% | 52,576 psi | 84% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,677 psi | 83% | 2808 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,992 psi | 75% | 2762 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,551 psi | 62% | 2605 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 39,320 psi | 63% | 2638 fps | 95.7% |
| Lovex S071 | <<locked>> | 94% | 34,853 psi | 56% | 2569 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,097 psi | 82% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,750 psi | 83% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,427 psi | 76% | 2812 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,963 psi | 74% | 2812 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 41,263 psi | 66% | 2812 fps | 96% |
| Norma URP | <<locked>> | 80% | 35,346 psi | 57% | 2595 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 80% | 47,630 psi | 76% | 2831 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,680 psi | 59% | 2638 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 41,466 psi | 66% | 2766 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,542 psi | 73% | 2753 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,895 psi | 83% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,930 psi | 67% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,954 psi | 56% | 2608 fps | 96.5% |
| ReloadSwiss RS 70 | 46.5 gr | 80% | 34,330 psi | 55% | 2618 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 48,689 psi | 78% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,221 psi | 68% | 2703 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 50,154 psi | 80% | 2858 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 43,613 psi | 70% | 2789 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 82% | 42,264 psi | 68% | 2680 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,551 psi | 62% | 2605 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,576 psi | 84% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,992 psi | 75% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,320 psi | 63% | 2638 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,555 psi | 70% | 2759 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,068 psi | 82% | 2851 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,199 psi | 84% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,961 psi | 70% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,637 psi | 60% | 2546 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,207 psi | 69% | 2782 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,793 psi | 83% | 2759 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,656 psi | 68% | 2703 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 31,691 psi | 51% | 2546 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 41,321 psi | 66% | 2710 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 52,779 psi | 85% | 2746 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,936 psi | 78% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,255 psi | 79% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,785 psi | 65% | 2635 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,811 psi | 59% | 2602 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 43,714 psi | 70% | 2749 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,500 psi | 76% | 2746 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,158 psi | 58% | 2598 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 29,428 psi | 47% | 2484 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 98% | 51,488 psi | 83% | 2992 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,100 psi | 58% | 2572 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 40,335 psi | 65% | 2713 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,035 psi | 43% | 2490 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,879 psi | 82% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,092 psi | 71% | 2759 fps | 95.1% |
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 x 64 Brenneke loaded with the .264 | 122gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,123 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 (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 122.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, 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. Alliant Reloder-16, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for 6.5 x 64 Brenneke with the .264 | 122gr | Peregrine VLR-5 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.