Load Specifications
Load data in caliber .284 Win. with .285 | 139gr | Prvi Partizan SP bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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% | 57,188 psi | 90% | 2812 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,362 psi | 88% | 2841 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,259 psi | 85% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,955 psi | 86% | 2838 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2740 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 56,420 psi | 88% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,507 psi | 89% | 2979 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,275 psi | 88% | 2917 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,232 psi | 90% | 2917 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,230 psi | 87% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,391 psi | 88% | 2841 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,246 psi | 88% | 3045 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,566 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,549 psi | 85% | 2910 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,042 psi | 86% | 3015 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,220 psi | 65% | 2769 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,282 psi | 73% | 2936 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,130 psi | 88% | 2933 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,853 psi | 86% | 2907 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,766 psi | 86% | 2877 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,797 psi | 89% | 2848 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,636 psi | 86% | 2897 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,884 psi | 89% | 3002 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,550 psi | 87% | 2917 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 55,259 psi | 87% | 2972 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 55,883 psi | 88% | 2933 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 56,869 psi | 89% | 2930 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,751 psi | 84% | 2907 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,652 psi | 89% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,941 psi | 88% | 3009 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 56% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,737 psi | 86% | 2881 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,072 psi | 89% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,985 psi | 89% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,724 psi | 89% | 2884 fps | 98.2% |
| IMR 4350 | <<locked>> | 98% | 55,201 psi | 87% | 2907 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,507 psi | 89% | 2907 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,710 psi | 89% | 2966 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,898 psi | 88% | 2940 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,230 psi | 87% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,463 psi | 88% | 2897 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,593 psi | 87% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,840 psi | 89% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,101 psi | 88% | 2904 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 57,174 psi | 90% | 2940 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 55,100 psi | 86% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,825 psi | 87% | 2867 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,232 psi | 90% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,709 psi | 87% | 2953 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 46,166 psi | 72% | 2890 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 55,288 psi | 87% | 2963 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 54,418 psi | 85% | 2923 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 53,925 psi | 85% | 2959 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 55,666 psi | 87% | 2890 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,216 psi | 87% | 2904 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,115 psi | 88% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,245 psi | 57% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,738 psi | 87% | 2900 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,259 psi | 87% | 2979 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,636 psi | 86% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,883 psi | 88% | 2995 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,448 psi | 87% | 3028 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 56,057 psi | 88% | 2844 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,709 psi | 87% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,694 psi | 86% | 2900 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,766 psi | 86% | 2877 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,101 psi | 88% | 2904 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,463 psi | 88% | 2897 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,840 psi | 89% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,174 psi | 90% | 2940 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,391 psi | 88% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,070 psi | 85% | 2867 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,868 psi | 86% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,347 psi | 88% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,898 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,492 psi | 89% | 2858 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 56,695 psi | 89% | 2900 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,912 psi | 88% | 2799 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,232 psi | 90% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,810 psi | 86% | 2894 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2966 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,545 psi | 78% | 2844 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 56,275 psi | 88% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,594 psi | 89% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,550 psi | 87% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,202 psi | 88% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,449 psi | 88% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,259 psi | 85% | 2907 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,680 psi | 87% | 2867 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,389 psi | 85% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,637 psi | 89% | 2963 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,498 psi | 71% | 2848 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,244 psi | 85% | 2884 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,956 psi | 88% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,622 psi | 87% | 2976 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,985 psi | 58% | 2779 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,708 psi | 86% | 2897 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% | 50,604 psi | 79% | 2720 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,250 psi | 68% | 2644 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,560 psi | 79% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,295 psi | 71% | 2674 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 40,509 psi | 63% | 2684 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,915 psi | 64% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,679 psi | 54% | 2572 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 46,659 psi | 73% | 2759 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,653 psi | 62% | 2605 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,718 psi | 76% | 2766 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,559 psi | 78% | 2749 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,656 psi | 67% | 2795 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,508 psi | 62% | 2631 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,308 psi | 66% | 2694 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,737 psi | 54% | 2585 fps | 95.8% |
| Alliant Reloder-17 | 46.4 gr | 80% | 34,200 psi | 54% | 2602 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,269 psi | 47% | 2490 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,940 psi | 55% | 2674 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,093 psi | 72% | 2766 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 39,291 psi | 62% | 2635 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,353 psi | 71% | 2710 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,270 psi | 79% | 2749 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,892 psi | 75% | 2789 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,997 psi | 83% | 2943 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 40,089 psi | 63% | 2638 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 42,482 psi | 67% | 2740 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 49,284 psi | 77% | 2822 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,079 psi | 74% | 2769 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,921 psi | 47% | 2428 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,294 psi | 68% | 2743 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 45,063 psi | 71% | 2815 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 42% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,252 psi | 71% | 2720 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 46,963 psi | 74% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,655 psi | 65% | 2641 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,034 psi | 69% | 2661 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 45,788 psi | 72% | 2743 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,367 psi | 70% | 2697 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 33,591 psi | 53% | 2530 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 43,352 psi | 68% | 2726 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 48,718 psi | 76% | 2766 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,238 psi | 72% | 2740 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,441 psi | 73% | 2694 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,669 psi | 65% | 2644 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 38,798 psi | 61% | 2585 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 41,800 psi | 66% | 2671 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 45,585 psi | 71% | 2707 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,108 psi | 72% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,727 psi | 65% | 2684 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 52,185 psi | 82% | 2897 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 43,047 psi | 67% | 2825 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,896 psi | 55% | 2575 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 41,408 psi | 65% | 2697 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 38,841 psi | 61% | 2671 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,762 psi | 76% | 2776 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,240 psi | 76% | 2792 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,562 psi | 82% | 2815 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,393 psi | 63% | 2621 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,005 psi | 71% | 2805 fps | 98.9% |
| ReloadSwiss RS 60 | 46.4 gr | 80% | 36,405 psi | 57% | 2671 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,374 psi | 54% | 2589 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,767 psi | 58% | 2654 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 49,763 psi | 78% | 2749 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,453 psi | 68% | 2661 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,898 psi | 58% | 2575 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 45,353 psi | 71% | 2710 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,798 psi | 61% | 2585 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,238 psi | 72% | 2740 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,669 psi | 65% | 2644 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 41,800 psi | 66% | 2671 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,985 psi | 60% | 2631 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,065 psi | 74% | 2749 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,281 psi | 71% | 2730 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,920 psi | 74% | 2657 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,218 psi | 61% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,366 psi | 68% | 2638 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 52,968 psi | 83% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,441 psi | 73% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,934 psi | 74% | 2746 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,579 psi | 59% | 2582 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 27,528 psi | 43% | 2415 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 46,166 psi | 72% | 2785 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 52,852 psi | 83% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,268 psi | 74% | 2648 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,149 psi | 68% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,598 psi | 68% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,824 psi | 56% | 2516 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 34,113 psi | 53% | 2523 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 48,979 psi | 77% | 2762 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,163 psi | 66% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,897 psi | 56% | 2575 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 32,692 psi | 51% | 2569 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,792 psi | 50% | 2444 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 48,936 psi | 77% | 2808 fps | 100% |
| Winchester 760 | 50 gr | 88% | 42,714 psi | 67% | 2746 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,313 psi | 48% | 2572 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,759 psi | 70% | 2733 fps | 99.6% |
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 116 powders for .284 Win. loaded with the .285 | 139gr | Prvi Partizan SP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,045 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.285" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .284 Win. with the .285 | 139gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.