Load Specifications
Load data in caliber .284 Win. with .284 | 145gr | 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 Power Pro 2000-MR, Hodgdon Superformance 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% | 56,913 psi | 89% | 2736 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,680 psi | 87% | 2759 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,651 psi | 87% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,883 psi | 88% | 2772 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,743 psi | 67% | 2664 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 55,608 psi | 87% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,593 psi | 87% | 2897 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,043 psi | 88% | 2841 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,855 psi | 89% | 2838 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,824 psi | 86% | 2792 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,709 psi | 87% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,796 psi | 87% | 2963 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,927 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,711 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,215 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,582 psi | 64% | 2694 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,455 psi | 71% | 2854 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,666 psi | 87% | 2858 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,201 psi | 85% | 2828 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,682 psi | 90% | 2851 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,362 psi | 88% | 2769 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,273 psi | 85% | 2822 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,463 psi | 88% | 2923 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,013 psi | 86% | 2841 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 54,795 psi | 86% | 2894 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 55,216 psi | 87% | 2854 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 56,608 psi | 89% | 2851 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,794 psi | 83% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,086 psi | 88% | 2884 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,405 psi | 87% | 2933 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 56% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,186 psi | 85% | 2802 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,565 psi | 89% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,492 psi | 89% | 2825 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,362 psi | 88% | 2805 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 54,404 psi | 85% | 2822 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,072 psi | 88% | 2831 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 2884 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,434 psi | 87% | 2864 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,824 psi | 86% | 2792 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,651 psi | 87% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,245 psi | 87% | 2766 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,362 psi | 88% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,347 psi | 87% | 2822 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 56,362 psi | 88% | 2858 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 54,766 psi | 86% | 2789 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,158 psi | 86% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,869 psi | 89% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,129 psi | 86% | 2874 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2815 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 54,360 psi | 85% | 2881 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 57,653 psi | 90% | 2900 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,956 psi | 89% | 2933 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,114 psi | 86% | 2812 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,607 psi | 86% | 2825 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,680 psi | 87% | 2792 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,187 psi | 57% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,361 psi | 87% | 2825 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,433 psi | 85% | 2897 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,041 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,288 psi | 87% | 2920 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,723 psi | 86% | 2946 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,709 psi | 87% | 2766 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,998 psi | 86% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,070 psi | 85% | 2822 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,682 psi | 90% | 2851 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,347 psi | 87% | 2822 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,651 psi | 87% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,362 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,362 psi | 88% | 2858 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,738 psi | 87% | 2881 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,392 psi | 90% | 2844 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,740 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,130 psi | 88% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,376 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,927 psi | 88% | 2779 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 55,912 psi | 88% | 2822 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,564 psi | 87% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,768 psi | 89% | 2831 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,447 psi | 85% | 2818 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,620 psi | 82% | 2884 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,660 psi | 76% | 2762 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 82% | 55,825 psi | 87% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,391 psi | 88% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,085 psi | 86% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,709 psi | 87% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,985 psi | 88% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,087 psi | 89% | 2881 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 55,347 psi | 87% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,363 psi | 90% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,956 psi | 88% | 2884 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2766 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,508 psi | 90% | 2858 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,448 psi | 87% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,795 psi | 86% | 2894 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,405 psi | 57% | 2700 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,070 psi | 85% | 2818 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% | 50,096 psi | 79% | 2644 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,105 psi | 68% | 2579 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,675 psi | 76% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,745 psi | 72% | 2608 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 39,798 psi | 62% | 2605 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,785 psi | 64% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,316 psi | 54% | 2507 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 46,383 psi | 73% | 2684 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,276 psi | 62% | 2533 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,414 psi | 76% | 2690 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,023 psi | 77% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | 45.1 gr | 80% | 42,134 psi | 66% | 2717 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,175 psi | 61% | 2559 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,018 psi | 66% | 2625 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,343 psi | 51% | 2464 fps | 95% |
| Alliant Reloder-17 | 44.5 gr | 80% | 33,924 psi | 53% | 2533 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,805 psi | 47% | 2421 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,447 psi | 54% | 2602 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,556 psi | 71% | 2690 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,798 psi | 61% | 2562 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,150 psi | 71% | 2641 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,922 psi | 78% | 2674 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,311 psi | 74% | 2710 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,460 psi | 82% | 2861 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,668 psi | 62% | 2569 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 41,916 psi | 66% | 2667 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 48,733 psi | 76% | 2746 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 46,804 psi | 73% | 2697 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,891 psi | 44% | 2313 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,917 psi | 67% | 2671 fps | 99.7% |
| Hodgdon Superformance | 52.9 gr | 90% | 44,788 psi | 70% | 2746 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 42% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,715 psi | 70% | 2644 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,775 psi | 73% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,263 psi | 65% | 2569 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,816 psi | 69% | 2592 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 45,324 psi | 71% | 2671 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,888 psi | 69% | 2621 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 33,257 psi | 52% | 2464 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 43,076 psi | 68% | 2654 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,414 psi | 76% | 2690 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,745 psi | 72% | 2664 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,035 psi | 72% | 2618 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,278 psi | 65% | 2572 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,421 psi | 60% | 2516 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 41,365 psi | 65% | 2595 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,513 psi | 71% | 2638 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,730 psi | 72% | 2641 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,408 psi | 65% | 2612 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 51,503 psi | 81% | 2815 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 42,569 psi | 67% | 2753 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,548 psi | 54% | 2507 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,886 psi | 64% | 2625 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 38,377 psi | 60% | 2598 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 48,312 psi | 76% | 2700 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,979 psi | 75% | 2720 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,011 psi | 82% | 2736 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,050 psi | 42% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,059 psi | 63% | 2552 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,527 psi | 70% | 2730 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,085 psi | 57% | 2598 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,997 psi | 53% | 2520 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,376 psi | 57% | 2582 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,501 psi | 78% | 2674 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,308 psi | 68% | 2592 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,579 psi | 57% | 2510 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 45,150 psi | 71% | 2641 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,421 psi | 60% | 2516 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,745 psi | 72% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,278 psi | 65% | 2572 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,365 psi | 65% | 2595 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,579 psi | 59% | 2559 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,833 psi | 73% | 2677 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,875 psi | 70% | 2657 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,659 psi | 73% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,957 psi | 61% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,018 psi | 67% | 2566 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,402 psi | 82% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,369 psi | 73% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,412 psi | 73% | 2671 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,449 psi | 59% | 2516 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 27,122 psi | 43% | 2346 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 45,774 psi | 72% | 2713 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,576 psi | 82% | 2641 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,036 psi | 74% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,902 psi | 67% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,279 psi | 68% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,505 psi | 56% | 2451 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,750 psi | 53% | 2454 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,399 psi | 76% | 2684 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,742 psi | 65% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,344 psi | 52% | 2457 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,126 psi | 50% | 2497 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,444 psi | 49% | 2379 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 48,515 psi | 76% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,134 psi | 66% | 2671 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,123 psi | 44% | 2441 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,411 psi | 70% | 2661 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 98 powders for .284 Win. loaded with the .284 | 145gr | Prvi Partizan SP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,963 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .284 Win. with the .284 | 145gr | Prvi Partizan SP 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.