Load Specifications
Load data in caliber 6.5 x 64 Brenneke with .264 | 115gr | Barnes TAC-TX BT bullet and 98 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-17 and ReloadSwiss RS 60.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 53,940 psi | 86% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,376 psi | 90% | 2972 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,124 psi | 79% | 2930 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 54,447 psi | 87% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,172 psi | 88% | 3058 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,099 psi | 87% | 3136 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 54,056 psi | 87% | 2986 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,390 psi | 89% | 2995 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,084 psi | 85% | 3038 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,318 psi | 90% | 2989 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,346 psi | 87% | 3114 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,011 psi | 85% | 3035 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,796 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,144 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,130 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,751 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,811 psi | 89% | 3084 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,240 psi | 79% | 3015 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,325 psi | 74% | 2956 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,437 psi | 65% | 2854 fps | 97% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 3159 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,273 psi | 87% | 3005 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 52,852 psi | 85% | 2976 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,240 psi | 79% | 3015 fps | 96.1% |
| Bofors RP7 | <<locked>> | 92% | 56,318 psi | 90% | 3012 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,420 psi | 90% | 3018 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,461 psi | 86% | 2989 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 54,070 psi | 87% | 3051 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 90% | 54,418 psi | 87% | 3018 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 54,650 psi | 88% | 2999 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 52,852 psi | 85% | 2989 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,940 psi | 88% | 3038 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,389 psi | 87% | 3091 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 57% | 1880 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,014 psi | 90% | 3005 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,201 psi | 89% | 2979 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,723 psi | 88% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,302 psi | 87% | 2956 fps | 98.3% |
| IMR 4350 | <<locked>> | 94% | 53,563 psi | 86% | 2986 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,578 psi | 88% | 2986 fps | 98.3% |
| IMR 4831 | <<locked>> | 96% | 55,869 psi | 90% | 3051 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 54,041 psi | 87% | 3012 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,318 psi | 90% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,201 psi | 87% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,258 psi | 85% | 2913 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,679 psi | 88% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,302 psi | 87% | 2979 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 55,680 psi | 89% | 3022 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,495 psi | 65% | 2766 fps | 96.3% |
| Norma 201 | <<locked>> | 84% | 56,115 psi | 90% | 2982 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,534 psi | 86% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,376 psi | 89% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,375 psi | 87% | 3035 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 52,301 psi | 84% | 3104 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 54,317 psi | 87% | 3048 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 56,420 psi | 90% | 3051 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,011 psi | 85% | 3038 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,521 psi | 59% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,664 psi | 86% | 2972 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,476 psi | 86% | 3051 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,505 psi | 86% | 3091 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,288 psi | 89% | 3081 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,172 psi | 87% | 3114 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 84% | 53,476 psi | 86% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,026 psi | 85% | 2972 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,071 psi | 88% | 3015 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,926 psi | 88% | 3068 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 56,318 psi | 90% | 3012 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,302 psi | 87% | 2979 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,201 psi | 87% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,679 psi | 88% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,680 psi | 89% | 3022 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,897 psi | 88% | 3035 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,259 psi | 89% | 2989 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,115 psi | 90% | 3012 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,954 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,737 psi | 88% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,157 psi | 87% | 2930 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,433 psi | 87% | 3061 fps | 97.2% |
| Somchem S335 | <<locked>> | 82% | 53,316 psi | 85% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,230 psi | 89% | 2982 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,272 psi | 85% | 2969 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,924 psi | 85% | 3045 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 3041 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 54,476 psi | 87% | 2854 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,534 psi | 86% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,070 psi | 87% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,636 psi | 88% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,434 psi | 90% | 3041 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2894 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 86% | 55,666 psi | 89% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,390 psi | 89% | 3041 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 3038 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,808 psi | 85% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,375 psi | 87% | 3058 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,655 psi | 67% | 2992 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,231 psi | 90% | 3018 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2979 fps | 96.5% |
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% | 47,340 psi | 76% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,963 psi | 74% | 2789 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 37,014 psi | 59% | 2687 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,831 psi | 72% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,518 psi | 54% | 2621 fps | 95.7% |
| Accurate High Country | <<locked>> | 98% | 50,473 psi | 81% | 3071 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,691 psi | 81% | 2930 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 43,004 psi | 69% | 2769 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 49,632 psi | 80% | 2976 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,837 psi | 85% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,210 psi | 76% | 2986 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 46,427 psi | 74% | 2910 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,163 psi | 69% | 2795 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,195 psi | 74% | 2867 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,475 psi | 54% | 2644 fps | 95.8% |
| Alliant Reloder-17 | 46.2 gr | 80% | 37,782 psi | 61% | 2779 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,950 psi | 78% | 2963 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,006 psi | 74% | 2949 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,312 psi | 47% | 2543 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,869 psi | 61% | 2789 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,098 psi | 55% | 2736 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,633 psi | 81% | 2946 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 43,149 psi | 69% | 2802 fps | 99.7% |
| Bofors RP5 | <<locked>> | 98% | 46,006 psi | 74% | 2949 fps | 95.1% |
| Bofors RP7 | <<locked>> | 84% | 43,685 psi | 70% | 2779 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,576 psi | 84% | 2963 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,845 psi | 70% | 2812 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 41,191 psi | 66% | 2805 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 86% | 47,514 psi | 76% | 2894 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 51,213 psi | 82% | 2943 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,864 psi | 49% | 2536 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,892 psi | 77% | 2920 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,729 psi | 70% | 2887 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 43% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,211 psi | 79% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,547 psi | 83% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,208 psi | 72% | 2808 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,514 psi | 76% | 2835 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 44,425 psi | 71% | 2815 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,540 psi | 68% | 2756 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 32,489 psi | 52% | 2582 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 47,369 psi | 76% | 2897 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,837 psi | 85% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,720 psi | 81% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,966 psi | 80% | 2858 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,223 psi | 73% | 2808 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,260 psi | 60% | 2644 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 40,263 psi | 65% | 2730 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 37,971 psi | 61% | 2710 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 49,588 psi | 80% | 2877 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,154 psi | 80% | 2877 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,556 psi | 73% | 2851 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 47,224 psi | 76% | 2907 fps | 95% |
| Norma MRP | <<locked>> | 94% | 42,351 psi | 68% | 2904 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 33,721 psi | 54% | 2625 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,818 psi | 73% | 2874 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 37,637 psi | 60% | 2730 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,048 psi | 71% | 2795 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,922 psi | 80% | 2989 fps | 99.7% |
| ReloadSwiss RS 60 | 46.2 gr | 80% | 40,234 psi | 65% | 2848 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,373 psi | 54% | 2638 fps | 95.1% |
| ReloadSwiss RS 70 | 48.1 gr | 82% | 35,491 psi | 57% | 2713 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 46,934 psi | 75% | 2825 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,437 psi | 65% | 2743 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 96% | 51,532 psi | 83% | 2953 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 47,863 psi | 77% | 2943 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 43,685 psi | 70% | 2779 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,260 psi | 60% | 2644 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,720 psi | 81% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,223 psi | 73% | 2808 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 40,263 psi | 65% | 2730 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,959 psi | 67% | 2802 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,459 psi | 83% | 2930 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,400 psi | 79% | 2900 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,488 psi | 81% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,424 psi | 68% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,553 psi | 67% | 2697 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,413 psi | 76% | 2936 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,343 psi | 81% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,474 psi | 83% | 2923 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 41,191 psi | 66% | 2749 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 30,327 psi | 49% | 2575 fps | 97.8% |
| Somchem S385 | <<locked>> | 92% | 42,511 psi | 68% | 2805 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 51,053 psi | 82% | 2805 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,065 psi | 75% | 2795 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,427 psi | 76% | 2808 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,117 psi | 63% | 2674 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 35,201 psi | 56% | 2631 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 98% | 44,672 psi | 72% | 2835 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 45,948 psi | 74% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,751 psi | 56% | 2631 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 32,140 psi | 52% | 2625 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,766 psi | 56% | 2608 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 41,437 psi | 66% | 2808 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,601 psi | 44% | 2562 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,139 psi | 79% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,762 psi | 78% | 2917 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 98 powders for 6.5 x 64 Brenneke loaded with the .264 | 115gr | Barnes TAC-TX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,159 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 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-17, ReloadSwiss RS 60 rank at the top here: for 6.5 x 64 Brenneke with the .264 | 115gr | Barnes TAC-TX BT 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.