Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 139gr | Barnes LRX 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 60, Alliant Power Pro 2000-MR 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% | 52,011 psi | 86% | 2723 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,824 psi | 89% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,359 psi | 89% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,301 psi | 87% | 2808 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,505 psi | 89% | 2782 fps | 96.1% |
| Accurate 4064 | <<locked>> | 92% | 53,359 psi | 89% | 2831 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,982 psi | 88% | 2907 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 86% | 51,198 psi | 85% | 2815 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 52,315 psi | 87% | 2815 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,708 psi | 89% | 2822 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,331 psi | 90% | 2799 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,288 psi | 90% | 2982 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,170 psi | 87% | 2841 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,678 psi | 88% | 2858 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,561 psi | 86% | 2913 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,576 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,347 psi | 60% | 2631 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,422 psi | 67% | 2782 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 50,952 psi | 85% | 2828 fps | 99% |
| Bofors RP3 | <<locked>> | 92% | 52,156 psi | 87% | 2848 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,982 psi | 88% | 2818 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,228 psi | 87% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,779 psi | 88% | 2848 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,184 psi | 85% | 2887 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 54,360 psi | 90% | 2818 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,708 psi | 89% | 2864 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 98% | 52,779 psi | 88% | 2904 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 96% | 53,853 psi | 89% | 2871 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 86% | 51,706 psi | 86% | 2825 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,747 psi | 79% | 2792 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 50,937 psi | 85% | 2858 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 98% | 53,853 psi | 89% | 2940 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 58% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,113 psi | 88% | 2831 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 51,343 psi | 85% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,764 psi | 86% | 2799 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,054 psi | 86% | 2776 fps | 96.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,127 psi | 88% | 2841 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 51,764 psi | 86% | 2799 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,372 psi | 84% | 2848 fps | 98.9% |
| IMR 4895 | <<locked>> | 90% | 54,027 psi | 90% | 2890 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,708 psi | 89% | 2822 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,490 psi | 89% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,911 psi | 90% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,389 psi | 90% | 2799 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 51,343 psi | 85% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,838 psi | 89% | 2841 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 51,445 psi | 85% | 2822 fps | 96.9% |
| Norma 201 | <<locked>> | 88% | 53,301 psi | 89% | 2815 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,766 psi | 89% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,866 psi | 86% | 2844 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 52,576 psi | 87% | 2897 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 90% | 52,243 psi | 87% | 2867 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,401 psi | 85% | 2890 fps | 97.6% |
| Ramshot TAC | <<locked>> | 86% | 54,172 psi | 90% | 2838 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,708 psi | 89% | 2858 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,242 psi | 85% | 2769 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,433 psi | 59% | 1781 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,287 psi | 89% | 2802 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,940 psi | 90% | 2841 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,721 psi | 88% | 2920 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,330 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,910 psi | 88% | 2930 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,171 psi | 88% | 2959 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 86% | 54,041 psi | 90% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,635 psi | 89% | 2808 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,025 psi | 86% | 2838 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 52,982 psi | 88% | 2818 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,838 psi | 89% | 2841 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,911 psi | 90% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,343 psi | 85% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 51,445 psi | 85% | 2822 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,027 psi | 90% | 2904 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,431 psi | 87% | 2815 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 52,982 psi | 88% | 2838 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,735 psi | 86% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,750 psi | 86% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,375 psi | 90% | 2795 fps | 97.1% |
| Somchem S321 | <<locked>> | 82% | 51,387 psi | 85% | 2802 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,375 psi | 90% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,996 psi | 86% | 2805 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 52,649 psi | 87% | 2841 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,978 psi | 78% | 2848 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 51,750 psi | 86% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,996 psi | 86% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,403 psi | 89% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 51,198 psi | 85% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,041 psi | 90% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 51,648 psi | 86% | 2841 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 54,259 psi | 90% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,576 psi | 87% | 2792 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,259 psi | 90% | 2904 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,204 psi | 65% | 2707 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,431 psi | 87% | 2828 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,041 psi | 90% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,142 psi | 88% | 2910 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,329 psi | 54% | 2605 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,765 psi | 88% | 2844 fps | 99.9% |
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% | 45,745 psi | 76% | 2631 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,198 psi | 83% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,956 psi | 63% | 2543 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,397 psi | 75% | 2700 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,995 psi | 83% | 2726 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 35,911 psi | 60% | 2530 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,751 psi | 58% | 2559 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 42,177 psi | 70% | 2651 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 35,897 psi | 60% | 2500 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,309 psi | 74% | 2664 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,338 psi | 74% | 2657 fps | 100% |
| Alliant Power Pro 2000-MR | 43.9 gr | 80% | 38,247 psi | 64% | 2671 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,389 psi | 59% | 2523 fps | 97.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,927 psi | 63% | 2582 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,418 psi | 59% | 2579 fps | 95.2% |
| Alliant Reloder-17 | 44.3 gr | 82% | 32,474 psi | 54% | 2530 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,082 psi | 53% | 2520 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,623 psi | 63% | 2713 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,539 psi | 69% | 2657 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 34,679 psi | 58% | 2520 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 49,763 psi | 83% | 2762 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,253 psi | 77% | 2657 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,902 psi | 71% | 2684 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,703 psi | 79% | 2828 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 50,952 psi | 85% | 2769 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,247 psi | 64% | 2579 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 46,166 psi | 77% | 2789 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 94% | 50,604 psi | 84% | 2815 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,569 psi | 71% | 2664 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,284 psi | 50% | 2418 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,667 psi | 64% | 2631 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 50,183 psi | 83% | 2881 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 43% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,031 psi | 68% | 2618 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 41,974 psi | 70% | 2661 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,666 psi | 63% | 2533 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,788 psi | 76% | 2664 fps | 95.2% |
| IMR 4350 | <<locked>> | 98% | 49,617 psi | 82% | 2782 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,542 psi | 76% | 2690 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 36,085 psi | 60% | 2575 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,856 psi | 65% | 2612 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,309 psi | 74% | 2664 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 49,922 psi | 83% | 2749 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,089 psi | 68% | 2631 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,554 psi | 71% | 2595 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 37,405 psi | 62% | 2539 fps | 98.5% |
| Lovex S065 | <<locked>> | 88% | 39,508 psi | 66% | 2579 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 45,107 psi | 75% | 2710 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,176 psi | 68% | 2605 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 41,713 psi | 69% | 2621 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,318 psi | 62% | 2569 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 35,331 psi | 59% | 2566 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 36,869 psi | 61% | 2582 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 42,090 psi | 70% | 2717 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,454 psi | 74% | 2667 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,830 psi | 73% | 2690 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,979 psi | 80% | 2713 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 44% | 1594 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,748 psi | 83% | 2749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,295 psi | 74% | 2674 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,798 psi | 66% | 2684 fps | 97.4% |
| ReloadSwiss RS 60 | 43.3 gr | 80% | 32,518 psi | 54% | 2546 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,115 psi | 62% | 2635 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,248 psi | 67% | 2707 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,092 psi | 75% | 2654 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,320 psi | 65% | 2559 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,590 psi | 54% | 2461 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 49,763 psi | 83% | 2762 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,508 psi | 66% | 2579 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,089 psi | 68% | 2631 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,405 psi | 62% | 2539 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 45,107 psi | 75% | 2710 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,823 psi | 56% | 2513 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,293 psi | 70% | 2635 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,915 psi | 68% | 2621 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,902 psi | 71% | 2569 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,491 psi | 59% | 2431 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,761 psi | 79% | 2690 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 48,008 psi | 80% | 2746 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,279 psi | 70% | 2569 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,279 psi | 70% | 2638 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 33,489 psi | 56% | 2467 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 27,572 psi | 46% | 2398 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,602 psi | 81% | 2635 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,236 psi | 72% | 2566 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,638 psi | 64% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,450 psi | 66% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,908 psi | 53% | 2411 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 37,086 psi | 62% | 2572 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 44,454 psi | 74% | 2664 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 37,797 psi | 63% | 2539 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,187 psi | 60% | 2566 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 34,330 psi | 57% | 2595 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,429 psi | 51% | 2385 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 44,019 psi | 73% | 2707 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 46,441 psi | 77% | 2792 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,400 psi | 51% | 2539 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,263 psi | 67% | 2625 fps | 98.5% |
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 108 powders for 7 x 64 Brenneke loaded with the .284 | 139gr | Barnes LRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, 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 60, Alliant Power Pro 2000-MR, Alliant Reloder-17 rank at the top here: for 7 x 64 Brenneke with the .284 | 139gr | Barnes LRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.