Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:145 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.284 Win. load data
Case Length (l3):2.17"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:66 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:12.0
Load data in caliber .284 Win. with .284 | 145gr | Speer Boat-Tail bullet and 98 powders. The key underlying parameters are shown in the table above.
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% | 56,637 psi | 89% | 2733 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,811 psi | 87% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,479 psi | 90% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,520 psi | 85% | 2762 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,540 psi | 67% | 2661 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 55,666 psi | 87% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,695 psi | 87% | 2900 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,782 psi | 87% | 2838 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,956 psi | 89% | 2841 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,926 psi | 86% | 2792 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,811 psi | 87% | 2762 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,535 psi | 87% | 2963 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,029 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,479 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,405 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,331 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,669 psi | 64% | 2694 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,513 psi | 71% | 2858 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,738 psi | 87% | 2858 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 57,711 psi | 90% | 2877 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,725 psi | 90% | 2854 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,449 psi | 88% | 2772 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,375 psi | 85% | 2822 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,188 psi | 88% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,129 psi | 86% | 2844 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 54,549 psi | 85% | 2890 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 55,288 psi | 87% | 2854 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 56,362 psi | 88% | 2851 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,881 psi | 83% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,159 psi | 88% | 2884 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,129 psi | 86% | 2927 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 56% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,551 psi | 90% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,637 psi | 89% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,260 psi | 88% | 2822 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,115 psi | 88% | 2802 fps | 98.2% |
| IMR 4350 | <<locked>> | 98% | 54,476 psi | 85% | 2825 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,144 psi | 88% | 2831 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,057 psi | 88% | 2887 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,550 psi | 87% | 2864 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,926 psi | 86% | 2792 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,767 psi | 87% | 2815 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,303 psi | 87% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,115 psi | 88% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,463 psi | 87% | 2825 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 56,405 psi | 88% | 2861 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 54,505 psi | 85% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,259 psi | 87% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,637 psi | 89% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,230 psi | 87% | 2874 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 45,324 psi | 71% | 2808 fps | 96% |
| Norma URP | <<locked>> | 98% | 54,433 psi | 85% | 2884 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 57,363 psi | 90% | 2897 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,072 psi | 89% | 2936 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 54,868 psi | 86% | 2808 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,708 psi | 86% | 2828 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,463 psi | 87% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 57% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,405 psi | 87% | 2825 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,505 psi | 85% | 2900 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,085 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,419 psi | 87% | 2923 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,810 psi | 86% | 2949 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,434 psi | 87% | 2762 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,100 psi | 86% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,580 psi | 90% | 2871 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,725 psi | 90% | 2854 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,463 psi | 87% | 2825 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,767 psi | 87% | 2815 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,115 psi | 88% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,405 psi | 88% | 2861 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,811 psi | 87% | 2881 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,159 psi | 90% | 2841 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,244 psi | 85% | 2812 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,854 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,144 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,651 psi | 87% | 2776 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 56,014 psi | 88% | 2822 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,317 psi | 87% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,869 psi | 89% | 2835 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,215 psi | 85% | 2815 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,359 psi | 82% | 2884 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,776 psi | 76% | 2766 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,564 psi | 87% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,144 psi | 88% | 2703 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,824 psi | 86% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,811 psi | 87% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,680 psi | 87% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,159 psi | 90% | 2881 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 55,114 psi | 86% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,450 psi | 90% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,014 psi | 88% | 2884 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,773 psi | 70% | 2769 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,305 psi | 90% | 2858 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,172 psi | 86% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,926 psi | 86% | 2897 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,506 psi | 57% | 2707 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,143 psi | 85% | 2818 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 50,183 psi | 79% | 2644 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,888 psi | 67% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,951 psi | 78% | 2723 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,875 psi | 70% | 2598 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 39,842 psi | 62% | 2608 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,553 psi | 64% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,995 psi | 50% | 2451 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 46,151 psi | 72% | 2680 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,349 psi | 62% | 2536 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,196 psi | 76% | 2687 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,110 psi | 77% | 2674 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,177 psi | 66% | 2720 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,247 psi | 62% | 2562 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,858 psi | 66% | 2618 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,416 psi | 51% | 2464 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,779 psi | 53% | 2530 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,834 psi | 47% | 2425 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,301 psi | 54% | 2598 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,643 psi | 72% | 2694 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,827 psi | 61% | 2562 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 44,947 psi | 70% | 2641 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,980 psi | 78% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,355 psi | 74% | 2713 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,562 psi | 82% | 2864 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,697 psi | 62% | 2569 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 41,945 psi | 66% | 2667 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 48,834 psi | 77% | 2749 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 46,586 psi | 73% | 2694 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,949 psi | 44% | 2313 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,714 psi | 67% | 2667 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 44,541 psi | 70% | 2740 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 42% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,788 psi | 70% | 2648 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,514 psi | 73% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,336 psi | 65% | 2569 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,859 psi | 69% | 2592 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 45,078 psi | 71% | 2667 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,961 psi | 69% | 2621 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 33,301 psi | 52% | 2467 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 42,873 psi | 67% | 2651 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,196 psi | 76% | 2687 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,122 psi | 72% | 2618 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,307 psi | 65% | 2572 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,450 psi | 60% | 2516 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 41,423 psi | 65% | 2598 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,266 psi | 71% | 2635 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,818 psi | 72% | 2644 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,220 psi | 65% | 2608 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 51,619 psi | 81% | 2818 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 42,395 psi | 66% | 2749 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,606 psi | 54% | 2507 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,944 psi | 64% | 2625 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 38,406 psi | 60% | 2598 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 48,370 psi | 76% | 2700 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,776 psi | 75% | 2717 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,083 psi | 82% | 2740 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 42% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,871 psi | 62% | 2549 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,295 psi | 69% | 2726 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,955 psi | 56% | 2598 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,040 psi | 53% | 2523 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,390 psi | 57% | 2582 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,255 psi | 77% | 2671 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,076 psi | 68% | 2589 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,608 psi | 57% | 2510 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 44,947 psi | 70% | 2641 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,450 psi | 60% | 2516 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,307 psi | 65% | 2572 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,423 psi | 65% | 2598 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,449 psi | 59% | 2556 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,615 psi | 73% | 2674 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,672 psi | 70% | 2651 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,485 psi | 73% | 2582 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,769 psi | 61% | 2454 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,033 psi | 67% | 2566 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,504 psi | 82% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,166 psi | 72% | 2585 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,441 psi | 73% | 2674 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,289 psi | 58% | 2513 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,166 psi | 43% | 2349 fps | 96.3% |
| Somchem S385 | <<locked>> | 98% | 45,585 psi | 71% | 2710 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,330 psi | 82% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,833 psi | 73% | 2575 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,656 psi | 67% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,308 psi | 68% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,549 psi | 56% | 2451 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,765 psi | 53% | 2454 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,486 psi | 76% | 2687 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,800 psi | 66% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,491 psi | 56% | 2510 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 32,184 psi | 50% | 2500 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,502 psi | 49% | 2379 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 48,283 psi | 76% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,945 psi | 66% | 2667 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,152 psi | 44% | 2441 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,193 psi | 69% | 2657 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 117 powders for .284 Win. loaded with the .284 | 145gr | Speer Boat-Tail. 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 117 of the 117 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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. As outliers, Accurate High Country, ADI AR 2213, 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.