Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 158gr | Prvi Partizan Grom bullet and 95 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-16 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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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>> | 84% | 52,243 psi | 87% | 2592 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,070 psi | 90% | 2648 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,151 psi | 77% | 2615 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 52,373 psi | 87% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,069 psi | 87% | 2726 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 52,141 psi | 87% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,214 psi | 88% | 2671 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,606 psi | 89% | 2759 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,346 psi | 90% | 2664 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,547 psi | 86% | 2776 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,505 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,853 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,055 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,128 psi | 90% | 2808 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,634 psi | 87% | 2749 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,497 psi | 72% | 2641 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,305 psi | 64% | 2549 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,037 psi | 81% | 2808 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 51,750 psi | 86% | 2680 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,867 psi | 89% | 2703 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,664 psi | 89% | 2680 fps | 98.1% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,838 psi | 89% | 2694 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,387 psi | 85% | 2671 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 51,140 psi | 85% | 2723 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 90% | 51,634 psi | 86% | 2687 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 52,736 psi | 88% | 2677 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,040 psi | 88% | 2710 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,170 psi | 87% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 50,995 psi | 85% | 2753 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,911 psi | 60% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,708 psi | 89% | 2677 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 52,881 psi | 88% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,475 psi | 87% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,359 psi | 87% | 2635 fps | 98.3% |
| IMR 4350 | <<locked>> | 96% | 54,317 psi | 90% | 2713 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,243 psi | 87% | 2661 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 52,562 psi | 87% | 2720 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 51,750 psi | 86% | 2687 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,346 psi | 90% | 2664 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 51,982 psi | 86% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 51,459 psi | 85% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,518 psi | 87% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,040 psi | 86% | 2657 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 53,055 psi | 88% | 2697 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,276 psi | 64% | 2474 fps | 96.2% |
| Norma 201 | <<locked>> | 84% | 54,302 psi | 90% | 2661 fps | 100% |
| Norma 202 | <<locked>> | 82% | 51,576 psi | 86% | 2615 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,142 psi | 88% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 94% | 51,184 psi | 85% | 2703 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 48,834 psi | 81% | 2769 fps | 97.8% |
| Norma URP | <<locked>> | 94% | 51,314 psi | 85% | 2717 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,417 psi | 89% | 2720 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,258 psi | 88% | 2762 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 54,418 psi | 90% | 2687 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,041 psi | 90% | 2700 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 61% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,372 psi | 85% | 2651 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 50,908 psi | 85% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,896 psi | 90% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 51,837 psi | 86% | 2749 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 50,691 psi | 84% | 2769 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 51,430 psi | 85% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,070 psi | 90% | 2700 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,590 psi | 86% | 2733 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 53,664 psi | 89% | 2680 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,040 psi | 86% | 2657 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 51,982 psi | 86% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,518 psi | 87% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,055 psi | 88% | 2697 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,909 psi | 86% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,895 psi | 88% | 2664 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,911 psi | 90% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,054 psi | 86% | 2552 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,504 psi | 87% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,011 psi | 86% | 2615 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,097 psi | 85% | 2726 fps | 96.9% |
| Somchem S335 | <<locked>> | 82% | 51,619 psi | 86% | 2552 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,750 psi | 88% | 2657 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,331 psi | 90% | 2700 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,837 psi | 88% | 2766 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,417 psi | 87% | 2717 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 52,504 psi | 87% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,488 psi | 86% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 51,851 psi | 86% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,156 psi | 87% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,432 psi | 89% | 2710 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,063 psi | 75% | 2582 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 86% | 53,534 psi | 89% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,562 psi | 87% | 2717 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,312 psi | 80% | 2710 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,272 psi | 89% | 2687 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 51,430 psi | 85% | 2726 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,059 psi | 65% | 2671 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,635 psi | 89% | 2694 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,023 psi | 81% | 2651 fps | 96.1% |
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% | 45,861 psi | 76% | 2503 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,251 psi | 74% | 2487 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 35,012 psi | 58% | 2405 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 43,381 psi | 72% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,213 psi | 54% | 2352 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 48,863 psi | 81% | 2615 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,655 psi | 69% | 2477 fps | 99% |
| ADI AR 2209 | <<locked>> | 96% | 47,137 psi | 78% | 2651 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,966 psi | 85% | 2615 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,034 psi | 75% | 2664 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,553 psi | 69% | 2497 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,498 psi | 74% | 2559 fps | 99.4% |
| Alliant Reloder-16 | 41.2 gr | 80% | 32,271 psi | 54% | 2362 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,114 psi | 60% | 2484 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,412 psi | 77% | 2644 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,614 psi | 44% | 2231 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,926 psi | 60% | 2490 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,184 psi | 53% | 2444 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,254 psi | 80% | 2625 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 41,582 psi | 69% | 2507 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 42,003 psi | 70% | 2477 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,430 psi | 84% | 2644 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,032 psi | 70% | 2510 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 39,349 psi | 65% | 2507 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 86% | 45,600 psi | 76% | 2582 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 49,371 psi | 82% | 2625 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,689 psi | 49% | 2267 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,672 psi | 76% | 2605 fps | 100% |
| Hodgdon Superformance | 50.4 gr | 86% | 41,249 psi | 69% | 2572 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 45% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,384 psi | 79% | 2579 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,661 psi | 83% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,787 psi | 73% | 2507 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,992 psi | 76% | 2526 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 42,395 psi | 70% | 2510 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,843 psi | 68% | 2457 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 31,227 psi | 52% | 2310 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 45,600 psi | 76% | 2585 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 50,966 psi | 85% | 2615 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,588 psi | 81% | 2592 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,544 psi | 81% | 2549 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,903 psi | 73% | 2510 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,056 psi | 60% | 2362 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 38,754 psi | 64% | 2438 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 35,911 psi | 60% | 2425 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 47,906 psi | 80% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,283 psi | 80% | 2566 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,845 psi | 73% | 2546 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 47,863 psi | 80% | 2648 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 39,900 psi | 66% | 2592 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 32,387 psi | 54% | 2352 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 43,772 psi | 73% | 2566 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 36,071 psi | 60% | 2444 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,821 psi | 84% | 2631 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,676 psi | 84% | 2648 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 45% | 1509 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,322 psi | 70% | 2493 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,529 psi | 79% | 2664 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,421 psi | 64% | 2543 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,865 psi | 53% | 2365 fps | 95.4% |
| ReloadSwiss RS 70 | 46.2 gr | 82% | 33,924 psi | 56% | 2425 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 45,672 psi | 76% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,972 psi | 65% | 2451 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 96% | 45,179 psi | 75% | 2625 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 84% | 42,003 psi | 70% | 2477 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,056 psi | 60% | 2362 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,588 psi | 81% | 2592 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,903 psi | 73% | 2510 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 38,754 psi | 64% | 2438 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,045 psi | 67% | 2503 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,501 psi | 82% | 2612 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,369 psi | 79% | 2589 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,965 psi | 81% | 2507 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,046 psi | 68% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,059 psi | 67% | 2408 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,744 psi | 74% | 2621 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 48,689 psi | 81% | 2510 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,095 psi | 82% | 2602 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,726 psi | 66% | 2454 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 29,182 psi | 48% | 2310 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 40,292 psi | 67% | 2503 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 49,400 psi | 82% | 2497 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,440 psi | 75% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,672 psi | 76% | 2503 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,681 psi | 63% | 2388 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 33,779 psi | 56% | 2356 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 98% | 42,134 psi | 70% | 2526 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 44,106 psi | 73% | 2497 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,272 psi | 55% | 2352 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 28,543 psi | 47% | 2300 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,315 psi | 55% | 2329 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 39,349 psi | 65% | 2507 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,469 psi | 44% | 2300 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,021 psi | 78% | 2592 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 45,687 psi | 76% | 2595 fps | 95.2% |
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 111 powders for 7 x 64 Brenneke loaded with the .284 | 158gr | Prvi Partizan Grom. Alliant Reloder-17 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,808 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for 7 x 64 Brenneke with the .284 | 158gr | Prvi Partizan Grom they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.