Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 140gr | Barnes TTSX BT bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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 2015 | <<locked>> | 84% | 52,736 psi | 88% | 2726 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,462 psi | 90% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,099 psi | 90% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,982 psi | 88% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,114 psi | 90% | 2785 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 54,070 psi | 90% | 2835 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,085 psi | 90% | 2913 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 51,837 psi | 86% | 2818 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 52,895 psi | 88% | 2818 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,346 psi | 90% | 2825 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 51,619 psi | 86% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 51,184 psi | 85% | 2927 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,808 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,330 psi | 89% | 2861 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,127 psi | 87% | 2917 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,171 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,028 psi | 62% | 2644 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,147 psi | 68% | 2792 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 51,532 psi | 86% | 2828 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 53,142 psi | 88% | 2854 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,534 psi | 89% | 2822 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,852 psi | 88% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,447 psi | 89% | 2851 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,880 psi | 86% | 2894 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 92% | 54,346 psi | 90% | 2867 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 98% | 53,751 psi | 89% | 2913 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 86% | 52,330 psi | 87% | 2828 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,385 psi | 80% | 2795 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 51,619 psi | 86% | 2861 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 50,705 psi | 84% | 2884 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 58% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,737 psi | 89% | 2835 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 52,112 psi | 87% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 52,388 psi | 87% | 2802 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,605 psi | 87% | 2779 fps | 97% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,679 psi | 89% | 2844 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,301 psi | 87% | 2805 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,995 psi | 85% | 2851 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 51,387 psi | 85% | 2841 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 54,346 psi | 90% | 2825 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,157 psi | 90% | 2805 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 51,271 psi | 85% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 51,764 psi | 86% | 2753 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 51,982 psi | 86% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,447 psi | 90% | 2844 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 52,054 psi | 86% | 2825 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 53,954 psi | 90% | 2818 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,447 psi | 90% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,504 psi | 87% | 2848 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 53,214 psi | 88% | 2900 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 52,881 psi | 88% | 2871 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,301 psi | 87% | 2897 fps | 97.9% |
| Ramshot TAC | <<locked>> | 84% | 51,271 psi | 85% | 2785 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,346 psi | 90% | 2861 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,822 psi | 86% | 2772 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 59% | 1778 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,954 psi | 90% | 2805 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 51,314 psi | 85% | 2795 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,476 psi | 89% | 2923 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,330 psi | 89% | 2963 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,925 psi | 90% | 2940 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,027 psi | 90% | 2969 fps | 99% |
| Rottweil R 901 | <<locked>> | 84% | 51,445 psi | 85% | 2749 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,230 psi | 90% | 2812 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,678 psi | 88% | 2841 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 53,534 psi | 89% | 2822 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,447 psi | 90% | 2844 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 51,271 psi | 85% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,982 psi | 86% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 52,054 psi | 86% | 2825 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 51,372 psi | 85% | 2854 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,026 psi | 88% | 2815 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,606 psi | 89% | 2841 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 52,402 psi | 87% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 52,373 psi | 87% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,517 psi | 86% | 2746 fps | 96.7% |
| Somchem S321 | <<locked>> | 82% | 52,011 psi | 86% | 2802 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,808 psi | 86% | 2713 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,576 psi | 87% | 2808 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 53,330 psi | 89% | 2841 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,587 psi | 79% | 2851 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 52,083 psi | 87% | 2677 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,634 psi | 87% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,143 psi | 90% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 51,779 psi | 86% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 51,314 psi | 85% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 52,272 psi | 87% | 2844 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 84% | 51,532 psi | 86% | 2772 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,171 psi | 88% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 51,561 psi | 86% | 2854 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,089 psi | 67% | 2717 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,968 psi | 88% | 2831 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 51,039 psi | 85% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,751 psi | 89% | 2913 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,895 psi | 55% | 2621 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,432 psi | 89% | 2848 fps | 100% |
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 2015 | <<locked>> | 80% | 46,427 psi | 77% | 2635 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,850 psi | 84% | 2746 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,595 psi | 64% | 2546 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,035 psi | 76% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,531 psi | 84% | 2730 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,506 psi | 61% | 2536 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,331 psi | 59% | 2566 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,757 psi | 71% | 2657 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,405 psi | 60% | 2507 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,904 psi | 75% | 2667 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 45,092 psi | 75% | 2661 fps | 100% |
| Alliant Power Pro 2000-MR | 44.2 gr | 80% | 38,783 psi | 64% | 2677 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,694 psi | 59% | 2523 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,493 psi | 64% | 2589 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,897 psi | 60% | 2585 fps | 95.6% |
| Alliant Reloder-17 | 43.5 gr | 80% | 30,705 psi | 51% | 2477 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,560 psi | 51% | 2470 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,348 psi | 64% | 2726 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,105 psi | 70% | 2661 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 35,244 psi | 59% | 2526 fps | 97.8% |
| Bofors RP7 | <<locked>> | 92% | 47,253 psi | 79% | 2713 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,818 psi | 78% | 2661 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,468 psi | 72% | 2687 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,385 psi | 80% | 2835 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 36,158 psi | 60% | 2526 fps | 95% |
| Hodgdon H414 | <<locked>> | 92% | 43,859 psi | 73% | 2740 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,149 psi | 72% | 2667 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,719 psi | 51% | 2425 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,247 psi | 65% | 2638 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 94% | 47,282 psi | 79% | 2822 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 43% | 1552 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,597 psi | 69% | 2621 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 42,685 psi | 71% | 2667 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,203 psi | 63% | 2539 fps | 97.2% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,325 psi | 77% | 2671 fps | 95.5% |
| IMR 4350 | <<locked>> | 96% | 47,166 psi | 78% | 2736 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 46,064 psi | 77% | 2694 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 34,287 psi | 57% | 2523 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 39,421 psi | 65% | 2618 fps | 98% |
| IMR 8208 XBR | <<locked>> | 80% | 44,904 psi | 75% | 2667 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 50,546 psi | 84% | 2753 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,698 psi | 69% | 2635 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,120 psi | 72% | 2602 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,942 psi | 63% | 2543 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 40,045 psi | 67% | 2585 fps | 95.3% |
| Lovex S070 | <<locked>> | 94% | 45,701 psi | 76% | 2717 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,727 psi | 69% | 2608 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 42,076 psi | 70% | 2618 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,855 psi | 63% | 2575 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 35,853 psi | 60% | 2572 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 37,391 psi | 62% | 2585 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 94% | 42,859 psi | 71% | 2726 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 44,933 psi | 75% | 2674 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,411 psi | 74% | 2694 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,544 psi | 81% | 2717 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,455 psi | 44% | 1591 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,401 psi | 84% | 2753 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,916 psi | 70% | 2621 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,480 psi | 67% | 2690 fps | 97.7% |
| ReloadSwiss RS 60 | 43.5 gr | 80% | 32,779 psi | 54% | 2549 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,666 psi | 63% | 2641 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,727 psi | 68% | 2713 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 45,440 psi | 75% | 2651 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,668 psi | 66% | 2559 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 33,127 psi | 55% | 2467 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 47,253 psi | 79% | 2713 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,045 psi | 67% | 2585 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,698 psi | 69% | 2635 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,942 psi | 63% | 2543 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 94% | 45,701 psi | 76% | 2717 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,301 psi | 57% | 2520 fps | 96.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,815 psi | 71% | 2641 fps | 96.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,437 psi | 69% | 2628 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,482 psi | 72% | 2572 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,998 psi | 60% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 45,005 psi | 75% | 2635 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 48,631 psi | 81% | 2749 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,844 psi | 71% | 2572 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,844 psi | 71% | 2644 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 34,011 psi | 57% | 2477 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 27,818 psi | 46% | 2398 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 49,211 psi | 82% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,816 psi | 73% | 2569 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,247 psi | 65% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,001 psi | 66% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,430 psi | 54% | 2418 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 86% | 35,041 psi | 58% | 2520 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,063 psi | 75% | 2667 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,334 psi | 64% | 2543 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,927 psi | 61% | 2575 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 32,648 psi | 54% | 2546 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,806 psi | 51% | 2388 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 44,353 psi | 74% | 2707 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 43,859 psi | 73% | 2740 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,763 psi | 51% | 2549 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,814 psi | 68% | 2628 fps | 98.7% |
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 96 powders for 7 x 64 Brenneke loaded with the .284 | 140gr | Barnes TTSX BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,969 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 7 x 64 Brenneke with the .284 | 140gr | Barnes TTSX 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.