Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 158gr | Sellier & Bellot XRG 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 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 51,358 psi | 85% | 2579 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,142 psi | 88% | 2628 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,252 psi | 75% | 2595 fps | 97.9% |
| Accurate 4064 | <<locked>> | 86% | 51,503 psi | 86% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 51,024 psi | 85% | 2707 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 51,372 psi | 85% | 2648 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,504 psi | 87% | 2654 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,823 psi | 88% | 2743 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,577 psi | 89% | 2648 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,404 psi | 90% | 2815 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,736 psi | 88% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,098 psi | 88% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 52,402 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,200 psi | 88% | 2792 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,851 psi | 86% | 2730 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,656 psi | 71% | 2618 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,652 psi | 63% | 2526 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,283 psi | 80% | 2792 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,186 psi | 90% | 2710 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 53,127 psi | 88% | 2690 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,069 psi | 88% | 2664 fps | 97.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,084 psi | 88% | 2677 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,853 psi | 89% | 2700 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 53,693 psi | 89% | 2756 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 54,157 psi | 90% | 2720 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 51,924 psi | 86% | 2657 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 52,040 psi | 86% | 2690 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,430 psi | 85% | 2690 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,766 psi | 89% | 2789 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 59% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,939 psi | 88% | 2661 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,924 psi | 86% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,040 psi | 86% | 2638 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,677 psi | 86% | 2618 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 53,461 psi | 89% | 2690 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 51,634 psi | 86% | 2644 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 51,547 psi | 86% | 2700 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 50,937 psi | 85% | 2671 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,577 psi | 89% | 2648 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 51,140 psi | 85% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,838 psi | 89% | 2625 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 51,706 psi | 86% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 51,111 psi | 85% | 2638 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 52,098 psi | 87% | 2674 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,449 psi | 62% | 2451 fps | 95.8% |
| Norma 201 | <<locked>> | 84% | 53,519 psi | 89% | 2644 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,954 psi | 90% | 2641 fps | 100% |
| Norma 203B | <<locked>> | 86% | 52,388 psi | 87% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,911 psi | 90% | 2740 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 47,790 psi | 79% | 2743 fps | 97.5% |
| Norma URP | <<locked>> | 96% | 53,577 psi | 89% | 2746 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 52,707 psi | 88% | 2707 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 52,344 psi | 87% | 2743 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 53,476 psi | 89% | 2667 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,359 psi | 89% | 2684 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,506 psi | 61% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,882 psi | 90% | 2684 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,316 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,837 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 50,894 psi | 85% | 2730 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,403 psi | 89% | 2805 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 54,273 psi | 90% | 2621 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,128 psi | 90% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,953 psi | 88% | 2680 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 54,433 psi | 90% | 2710 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,647 psi | 84% | 2713 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 53,069 psi | 88% | 2664 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 51,111 psi | 85% | 2638 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 51,140 psi | 85% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,706 psi | 86% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,098 psi | 87% | 2674 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,213 psi | 85% | 2690 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,156 psi | 87% | 2648 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,866 psi | 88% | 2667 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 51,561 psi | 86% | 2539 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 51,793 psi | 86% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,317 psi | 90% | 2641 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,154 psi | 83% | 2707 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 54,259 psi | 90% | 2582 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 51,735 psi | 86% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,258 psi | 88% | 2677 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 51,764 psi | 86% | 2746 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,242 psi | 85% | 2690 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 82% | 51,924 psi | 86% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,824 psi | 89% | 2605 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 51,039 psi | 85% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 51,140 psi | 85% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,431 psi | 87% | 2690 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 53,722 psi | 89% | 2644 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,547 psi | 87% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 51,634 psi | 86% | 2697 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,340 psi | 79% | 2690 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,504 psi | 87% | 2671 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,157 psi | 90% | 2694 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,027 psi | 90% | 2762 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,203 psi | 63% | 2644 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,895 psi | 88% | 2677 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 2495 | <<locked>> | 80% | 44,962 psi | 75% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,845 psi | 73% | 2474 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 36,709 psi | 61% | 2438 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 42,569 psi | 71% | 2487 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,502 psi | 52% | 2329 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 48,095 psi | 80% | 2595 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,930 psi | 68% | 2457 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 46,383 psi | 77% | 2631 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,140 psi | 83% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,280 psi | 74% | 2644 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,046 psi | 68% | 2480 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,743 psi | 73% | 2539 fps | 99.3% |
| Alliant Reloder-16 | 40.6 gr | 80% | 31,879 psi | 53% | 2346 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,476 psi | 59% | 2467 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 45,614 psi | 76% | 2625 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,731 psi | 46% | 2264 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,317 psi | 59% | 2467 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 33,924 psi | 56% | 2487 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,572 psi | 79% | 2608 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 40,799 psi | 68% | 2487 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 41,379 psi | 69% | 2461 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,690 psi | 83% | 2628 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,307 psi | 69% | 2490 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 38,682 psi | 64% | 2487 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 44,918 psi | 75% | 2562 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 48,559 psi | 81% | 2605 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,283 psi | 49% | 2254 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,889 psi | 75% | 2589 fps | 100% |
| Hodgdon Superformance | 49.6 gr | 86% | 40,553 psi | 67% | 2552 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 44% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,615 psi | 77% | 2559 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,689 psi | 81% | 2592 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,018 psi | 71% | 2490 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,324 psi | 75% | 2510 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 41,800 psi | 69% | 2493 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,451 psi | 67% | 2444 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 30,777 psi | 51% | 2297 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,802 psi | 74% | 2566 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 50,140 psi | 83% | 2598 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,790 psi | 79% | 2575 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,790 psi | 79% | 2533 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,105 psi | 72% | 2490 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,404 psi | 59% | 2343 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 38,087 psi | 63% | 2418 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 35,070 psi | 58% | 2402 fps | 95% |
| Norma 201 | <<locked>> | 80% | 47,123 psi | 78% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,732 psi | 79% | 2552 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,105 psi | 72% | 2530 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 46,992 psi | 78% | 2625 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 41,669 psi | 69% | 2625 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 31,894 psi | 53% | 2336 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 43,062 psi | 72% | 2549 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 37,710 psi | 63% | 2474 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 50,183 psi | 83% | 2615 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,951 psi | 83% | 2631 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 45% | 1506 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,669 psi | 69% | 2474 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,644 psi | 77% | 2648 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,753 psi | 63% | 2523 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,227 psi | 52% | 2346 fps | 95% |
| ReloadSwiss RS 70 | 45.5 gr | 82% | 33,417 psi | 56% | 2405 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 51,416 psi | 85% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,831 psi | 74% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,435 psi | 64% | 2438 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 51,198 psi | 85% | 2661 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 44,324 psi | 74% | 2605 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 41,379 psi | 69% | 2461 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,404 psi | 59% | 2343 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,790 psi | 79% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,105 psi | 72% | 2490 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 38,087 psi | 63% | 2418 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,349 psi | 65% | 2484 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,805 psi | 81% | 2595 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,673 psi | 78% | 2569 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,414 psi | 80% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,538 psi | 67% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,421 psi | 65% | 2388 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,775 psi | 78% | 2651 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 47,906 psi | 80% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,399 psi | 80% | 2585 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,001 psi | 65% | 2438 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 28,587 psi | 47% | 2290 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 42,264 psi | 70% | 2536 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 48,834 psi | 81% | 2484 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,831 psi | 74% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,179 psi | 75% | 2490 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,217 psi | 62% | 2375 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 33,127 psi | 55% | 2333 fps | 96% |
| Vihtavuori N530 | <<locked>> | 80% | 50,531 psi | 84% | 2595 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,381 psi | 72% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,648 psi | 54% | 2336 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 29,965 psi | 50% | 2336 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,779 psi | 54% | 2313 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 50,633 psi | 84% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 38,682 psi | 64% | 2487 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,789 psi | 46% | 2339 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,282 psi | 77% | 2575 fps | 99.9% |
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 7 x 64 Brenneke loaded with the .284 | 158gr | Sellier & Bellot XRG. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,815 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 (415 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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. Alliant Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for 7 x 64 Brenneke with the .284 | 158gr | Sellier & Bellot XRG 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.