Load Specifications
Load data in caliber .284 Win. with .284 | 140gr | Sierra Pro-Hunter bullet and 99 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 ReloadSwiss RS 60.
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% | 55,463 psi | 87% | 2766 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,276 psi | 90% | 2838 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,056 psi | 85% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,738 psi | 87% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,956 psi | 89% | 2841 fps | 97.3% |
| Accurate 4064 | <<locked>> | 92% | 57,667 psi | 90% | 2884 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,725 psi | 90% | 2972 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,549 psi | 85% | 2867 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,434 psi | 87% | 2864 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,014 psi | 89% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,433 psi | 85% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,099 psi | 85% | 2986 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,680 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,115 psi | 88% | 2910 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2972 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,536 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,508 psi | 62% | 2710 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,121 psi | 69% | 2867 fps | 98% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,433 psi | 85% | 2884 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 56,246 psi | 88% | 2904 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,101 psi | 88% | 2871 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,085 psi | 86% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,623 psi | 89% | 2900 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,723 psi | 86% | 2943 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 57,595 psi | 90% | 2858 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,174 psi | 90% | 2917 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 56,753 psi | 89% | 2969 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 57,290 psi | 90% | 2927 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 55,143 psi | 86% | 2877 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,387 psi | 81% | 2851 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,404 psi | 85% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,635 psi | 84% | 2943 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 56% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,333 psi | 88% | 2881 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,882 psi | 86% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,027 psi | 86% | 2851 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,998 psi | 86% | 2828 fps | 97.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2897 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,636 psi | 86% | 2851 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 2910 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 57,566 psi | 90% | 2943 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,014 psi | 89% | 2867 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,246 psi | 90% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,375 psi | 85% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,493 psi | 90% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,839 psi | 86% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,450 psi | 90% | 2897 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 55,071 psi | 86% | 2881 fps | 98% |
| Norma 201 | <<locked>> | 88% | 56,608 psi | 89% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,334 psi | 90% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,288 psi | 87% | 2897 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2946 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 56,318 psi | 88% | 2956 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 55,898 psi | 88% | 2923 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,172 psi | 86% | 2953 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 57,174 psi | 90% | 2887 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,000 psi | 89% | 2907 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,360 psi | 85% | 2818 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 56% | 1795 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,362 psi | 88% | 2848 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,406 psi | 90% | 2897 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,884 psi | 89% | 2982 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,304 psi | 88% | 3015 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2992 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3028 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 86% | 57,638 psi | 90% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,232 psi | 90% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,115 psi | 88% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,101 psi | 88% | 2871 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,450 psi | 90% | 2897 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,375 psi | 85% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,839 psi | 86% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,071 psi | 86% | 2881 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,711 psi | 90% | 2956 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,840 psi | 88% | 2867 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,536 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,810 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,955 psi | 86% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,404 psi | 85% | 2799 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 54,766 psi | 86% | 2851 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,406 psi | 90% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,521 psi | 87% | 2861 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,159 psi | 88% | 2890 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2907 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,505 psi | 85% | 2717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,027 psi | 86% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,942 psi | 89% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,186 psi | 85% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,346 psi | 85% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,303 psi | 87% | 2897 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 57,638 psi | 90% | 2871 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,840 psi | 88% | 2835 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,563 psi | 86% | 2907 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,294 psi | 68% | 2785 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,811 psi | 87% | 2881 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,566 psi | 90% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,087 psi | 89% | 2972 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,215 psi | 55% | 2700 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,449 psi | 88% | 2900 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% | 49,110 psi | 77% | 2674 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,621 psi | 84% | 2789 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,785 psi | 65% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,733 psi | 76% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,862 psi | 73% | 2677 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,494 psi | 62% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,563 psi | 56% | 2575 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 45,150 psi | 71% | 2707 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,479 psi | 60% | 2556 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,210 psi | 74% | 2717 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,572 psi | 75% | 2700 fps | 100% |
| Alliant Power Pro 2000-MR | 45.2 gr | 80% | 41,162 psi | 65% | 2740 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,058 psi | 60% | 2579 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,843 psi | 64% | 2641 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,605 psi | 53% | 2533 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,895 psi | 52% | 2543 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,806 psi | 48% | 2487 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,781 psi | 56% | 2671 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,295 psi | 69% | 2710 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 37,840 psi | 59% | 2585 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,615 psi | 73% | 2713 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,008 psi | 77% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,224 psi | 72% | 2740 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,894 psi | 80% | 2884 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 54,128 psi | 85% | 2812 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,479 psi | 60% | 2582 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,366 psi | 68% | 2740 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 50,546 psi | 79% | 2822 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,556 psi | 71% | 2720 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,806 psi | 48% | 2431 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,597 psi | 65% | 2690 fps | 99.3% |
| Hodgdon Superformance | 54.1 gr | 92% | 46,644 psi | 73% | 2822 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 42% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,787 psi | 69% | 2671 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 45,397 psi | 71% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,408 psi | 63% | 2592 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,600 psi | 71% | 2667 fps | 95.7% |
| IMR 4350 | <<locked>> | 94% | 46,992 psi | 74% | 2740 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,600 psi | 71% | 2694 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 34,447 psi | 54% | 2533 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,829 psi | 66% | 2674 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,210 psi | 74% | 2717 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,577 psi | 84% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,367 psi | 70% | 2687 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,237 psi | 71% | 2648 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 40,408 psi | 63% | 2598 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,856 psi | 62% | 2589 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 42,888 psi | 67% | 2667 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 44,280 psi | 69% | 2661 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,512 psi | 70% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,205 psi | 63% | 2631 fps | 98.4% |
| Norma 204 | <<locked>> | 98% | 53,476 psi | 84% | 2890 fps | 95.6% |
| Norma URP | <<locked>> | 86% | 35,839 psi | 56% | 2579 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,827 psi | 62% | 2644 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 39,929 psi | 63% | 2674 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,079 psi | 74% | 2720 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,630 psi | 73% | 2740 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,039 psi | 80% | 2766 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 42% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,779 psi | 83% | 2795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,582 psi | 65% | 2625 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,091 psi | 68% | 2746 fps | 98.5% |
| ReloadSwiss RS 60 | 44.5 gr | 80% | 35,012 psi | 55% | 2612 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,346 psi | 55% | 2592 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,884 psi | 59% | 2657 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 48,254 psi | 76% | 2703 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,192 psi | 66% | 2615 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,418 psi | 56% | 2523 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 46,615 psi | 73% | 2713 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,856 psi | 62% | 2589 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,367 psi | 70% | 2687 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,408 psi | 63% | 2598 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,888 psi | 67% | 2667 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,448 psi | 57% | 2575 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,484 psi | 71% | 2697 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,656 psi | 68% | 2677 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,556 psi | 71% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,927 psi | 59% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,715 psi | 70% | 2638 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 51,039 psi | 80% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,208 psi | 71% | 2615 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,078 psi | 71% | 2690 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 36,376 psi | 57% | 2533 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 26,426 psi | 41% | 2359 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,329 psi | 80% | 2671 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,876 psi | 72% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,611 psi | 65% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,061 psi | 66% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,447 psi | 54% | 2467 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,998 psi | 55% | 2523 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,442 psi | 74% | 2713 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,596 psi | 64% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,490 psi | 54% | 2526 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 33,141 psi | 52% | 2562 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,589 psi | 48% | 2388 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 47,123 psi | 74% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,656 psi | 68% | 2743 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,951 psi | 49% | 2569 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,091 psi | 68% | 2680 fps | 99.3% |
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 115 powders for .284 Win. loaded with the .284 | 140gr | Sierra Pro-Hunter. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,028 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:12.5 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .284 Win. with the .284 | 140gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.