Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 139gr | Hasler ARIETE bullet and 96 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 Reloder-17 and Alliant Power Pro 2000-MR.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 51,576 psi | 86% | 2713 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,069 psi | 88% | 2782 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 52,576 psi | 87% | 2772 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 51,256 psi | 85% | 2789 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 52,692 psi | 88% | 2762 fps | 95.8% |
| Accurate 4064 | <<locked>> | 92% | 52,634 psi | 87% | 2818 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,025 psi | 86% | 2887 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 53,809 psi | 89% | 2851 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 51,735 psi | 86% | 2799 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,055 psi | 88% | 2805 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,461 psi | 89% | 2785 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,359 psi | 89% | 2963 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 51,242 psi | 85% | 2822 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,317 psi | 90% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,069 psi | 87% | 2841 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,749 psi | 84% | 2894 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 96% | 51,779 psi | 86% | 2936 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,723 psi | 59% | 2612 fps | 97.1% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,635 psi | 89% | 2864 fps | 99.3% |
| Bofors RP3 | <<locked>> | 92% | 51,517 psi | 86% | 2835 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 52,127 psi | 87% | 2795 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 84% | 51,909 psi | 86% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,156 psi | 87% | 2835 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,230 psi | 90% | 2933 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 53,548 psi | 89% | 2802 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 52,779 psi | 88% | 2844 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 98% | 51,953 psi | 86% | 2887 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 54,331 psi | 90% | 2861 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,891 psi | 78% | 2772 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,635 psi | 89% | 2894 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 52,910 psi | 88% | 2920 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,911 psi | 58% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 52,475 psi | 87% | 2815 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 54,056 psi | 90% | 2848 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,111 psi | 85% | 2782 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,503 psi | 86% | 2759 fps | 96.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,359 psi | 87% | 2825 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,215 psi | 90% | 2831 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,516 psi | 82% | 2828 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 53,388 psi | 89% | 2874 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,055 psi | 88% | 2805 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 52,852 psi | 88% | 2789 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,229 psi | 88% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,780 psi | 89% | 2782 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 53,998 psi | 90% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,026 psi | 88% | 2822 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,925 psi | 90% | 2858 fps | 97.3% |
| Norma 201 | <<locked>> | 88% | 52,634 psi | 87% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,098 psi | 88% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,256 psi | 85% | 2831 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 51,706 psi | 86% | 2881 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 90% | 51,358 psi | 85% | 2848 fps | 99.5% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,647 psi | 84% | 2871 fps | 97.4% |
| Ramshot TAC | <<locked>> | 86% | 53,301 psi | 89% | 2818 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,823 psi | 88% | 2841 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,172 psi | 90% | 2808 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 59% | 1775 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 52,576 psi | 87% | 2789 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,432 psi | 89% | 2828 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,011 psi | 86% | 2904 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 51,474 psi | 86% | 2936 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,040 psi | 86% | 2913 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,504 psi | 87% | 2940 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 86% | 53,287 psi | 89% | 2779 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 52,924 psi | 88% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,387 psi | 85% | 2825 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 96% | 52,127 psi | 87% | 2795 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,026 psi | 88% | 2822 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,229 psi | 88% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,998 psi | 90% | 2831 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,925 psi | 90% | 2858 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,490 psi | 89% | 2890 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 51,547 psi | 86% | 2795 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 52,388 psi | 87% | 2822 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,447 psi | 90% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,082 psi | 85% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,548 psi | 89% | 2776 fps | 96.9% |
| Somchem S321 | <<locked>> | 84% | 54,375 psi | 90% | 2841 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,737 psi | 89% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,401 psi | 85% | 2792 fps | 99.5% |
| Somchem S355 | <<locked>> | 94% | 52,083 psi | 87% | 2828 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,151 psi | 77% | 2828 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,317 psi | 90% | 2710 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,285 psi | 85% | 2684 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 52,634 psi | 87% | 2766 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,838 psi | 89% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,490 psi | 89% | 2805 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,230 psi | 90% | 2877 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 53,563 psi | 89% | 2805 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,011 psi | 86% | 2779 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,113 psi | 88% | 2881 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,406 psi | 64% | 2687 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 51,503 psi | 86% | 2808 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 53,345 psi | 89% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,257 psi | 87% | 2890 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,214 psi | 87% | 2831 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% | 45,295 psi | 75% | 2618 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,487 psi | 82% | 2726 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,463 psi | 62% | 2530 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,701 psi | 74% | 2684 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,516 psi | 82% | 2713 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 35,476 psi | 59% | 2516 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 36,622 psi | 61% | 2598 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 41,785 psi | 69% | 2638 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,549 psi | 59% | 2487 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,932 psi | 73% | 2651 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 43,511 psi | 72% | 2641 fps | 100% |
| Alliant Power Pro 2000-MR | 43.3 gr | 80% | 37,710 psi | 63% | 2651 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,780 psi | 58% | 2503 fps | 97.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,256 psi | 85% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,550 psi | 62% | 2569 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,202 psi | 62% | 2618 fps | 95.8% |
| Alliant Reloder-17 | 43.7 gr | 82% | 32,010 psi | 53% | 2513 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,473 psi | 52% | 2500 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,973 psi | 68% | 2638 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 34,069 psi | 57% | 2500 fps | 97.3% |
| Bofors RP7 | <<locked>> | 94% | 48,907 psi | 81% | 2743 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,861 psi | 76% | 2648 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,279 psi | 70% | 2664 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,673 psi | 78% | 2808 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 50,183 psi | 83% | 2753 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 37,666 psi | 63% | 2562 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 94% | 45,339 psi | 75% | 2769 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,177 psi | 70% | 2651 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,792 psi | 53% | 2454 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,043 psi | 63% | 2615 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 96% | 49,269 psi | 82% | 2854 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,962 psi | 43% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,393 psi | 67% | 2598 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 41,495 psi | 69% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,275 psi | 62% | 2520 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,223 psi | 75% | 2648 fps | 95% |
| IMR 4350 | <<locked>> | 98% | 49,168 psi | 82% | 2772 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,892 psi | 80% | 2726 fps | 95.6% |
| IMR 4831 | <<locked>> | 90% | 35,520 psi | 59% | 2556 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,464 psi | 64% | 2598 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 43,932 psi | 73% | 2651 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 49,226 psi | 82% | 2733 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,379 psi | 67% | 2615 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 42,221 psi | 70% | 2582 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 36,999 psi | 61% | 2526 fps | 98.3% |
| Lovex S065 | <<locked>> | 90% | 41,510 psi | 69% | 2618 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 44,643 psi | 74% | 2697 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,756 psi | 68% | 2592 fps | 99% |
| Norma 202 | <<locked>> | 80% | 41,031 psi | 68% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,898 psi | 61% | 2556 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 37,173 psi | 62% | 2605 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 36,303 psi | 60% | 2562 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 94% | 41,669 psi | 69% | 2703 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 43,874 psi | 73% | 2651 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,221 psi | 72% | 2674 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,384 psi | 79% | 2700 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 44% | 1588 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,356 psi | 82% | 2736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,772 psi | 73% | 2661 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,131 psi | 65% | 2664 fps | 97.1% |
| ReloadSwiss RS 60 | 42.7 gr | 80% | 32,024 psi | 53% | 2526 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,390 psi | 60% | 2615 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,639 psi | 66% | 2687 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 44,353 psi | 74% | 2635 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,696 psi | 64% | 2543 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 31,981 psi | 53% | 2444 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 94% | 48,907 psi | 81% | 2743 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,510 psi | 69% | 2618 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,379 psi | 67% | 2615 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 36,999 psi | 61% | 2526 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 94% | 44,643 psi | 74% | 2697 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,257 psi | 55% | 2497 fps | 95.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,713 psi | 69% | 2618 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,292 psi | 67% | 2605 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,511 psi | 71% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,099 psi | 58% | 2421 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 46,949 psi | 78% | 2667 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 47,398 psi | 79% | 2730 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,916 psi | 70% | 2556 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,698 psi | 69% | 2621 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 33,112 psi | 55% | 2454 fps | 96.4% |
| Somchem S365 | <<locked>> | 86% | 28,935 psi | 48% | 2434 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 48,138 psi | 80% | 2621 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,815 psi | 71% | 2556 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,130 psi | 63% | 2533 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,769 psi | 64% | 2539 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 31,343 psi | 52% | 2395 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 36,303 psi | 60% | 2549 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 43,801 psi | 73% | 2644 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 37,449 psi | 62% | 2526 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 38,305 psi | 64% | 2608 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 33,837 psi | 56% | 2579 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,140 psi | 53% | 2425 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 43,337 psi | 72% | 2690 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 45,614 psi | 76% | 2776 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,653 psi | 66% | 2608 fps | 98.3% |
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 | Hasler ARIETE. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,732 fps to 2,963 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 53–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:9.0 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 Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for 7 x 64 Brenneke with the .284 | 139gr | Hasler ARIETE 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.