Load Specifications
Bullet:.284 | 160gr | Hornady CX
Bullet Manufacturer:Hornady
Bullet Weight:160 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.280 Ackley Improved load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:8.0
Load data in caliber .280 Ackley Improved with .284 | 160gr | Hornady CX bullet and 109 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Hodgdon Superformance.
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>> | 82% | 57,754 psi | 89% | 2641 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,174 psi | 88% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,999 psi | 86% | 2703 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,472 psi | 75% | 2674 fps | 99% |
| Accurate 4064 | <<locked>> | 88% | 57,479 psi | 88% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,349 psi | 90% | 2835 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,464 psi | 88% | 2762 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,450 psi | 90% | 2766 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,173 psi | 86% | 2828 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,985 psi | 86% | 2707 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,667 psi | 89% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,943 psi | 89% | 2890 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,506 psi | 85% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,927 psi | 86% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,506 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,029 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,158 psi | 85% | 2815 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 2756 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,803 psi | 70% | 2700 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,987 psi | 62% | 2615 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,272 psi | 80% | 2881 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,392 psi | 88% | 2782 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 44,541 psi | 69% | 2677 fps | 95.9% |
| Bofors RP3 | <<locked>> | 88% | 56,043 psi | 86% | 2753 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 2756 fps | 97.1% |
| Bofors RP7 | <<locked>> | 92% | 55,927 psi | 86% | 2740 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,319 psi | 88% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,796 psi | 86% | 2736 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,971 psi | 88% | 2772 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 57,276 psi | 88% | 2838 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 92% | 57,435 psi | 88% | 2799 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,708 psi | 83% | 2762 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 84% | 58,146 psi | 89% | 2772 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,869 psi | 86% | 2762 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,218 psi | 90% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,711 psi | 89% | 2877 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 55% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,593 psi | 86% | 2723 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,697 psi | 90% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,856 psi | 89% | 2746 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,334 psi | 88% | 2736 fps | 99.3% |
| IMR 4350 | <<locked>> | 96% | 56,739 psi | 87% | 2772 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,682 psi | 89% | 2766 fps | 99.3% |
| IMR 4831 | <<locked>> | 98% | 58,813 psi | 90% | 2825 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,392 psi | 88% | 2789 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,724 psi | 86% | 2756 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 82% | 55,985 psi | 86% | 2707 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,624 psi | 89% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,420 psi | 87% | 2687 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,754 psi | 89% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,334 psi | 88% | 2759 fps | 99.9% |
| Lovex S070 | <<locked>> | 96% | 58,697 psi | 90% | 2802 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,914 psi | 61% | 2526 fps | 97.4% |
| Norma 201 | <<locked>> | 84% | 55,738 psi | 86% | 2700 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,710 psi | 87% | 2703 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,755 psi | 90% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,537 psi | 89% | 2822 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 51,387 psi | 79% | 2835 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 57,290 psi | 88% | 2822 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,912 psi | 86% | 2776 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,999 psi | 86% | 2825 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 56,159 psi | 86% | 2736 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,318 psi | 87% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 56% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,058 psi | 88% | 2759 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,898 psi | 88% | 2828 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,840 psi | 87% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,363 psi | 90% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,116 psi | 88% | 2890 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,695 psi | 87% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,318 psi | 87% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,275 psi | 87% | 2749 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,957 psi | 89% | 2799 fps | 97.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 2799 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 55,927 psi | 86% | 2740 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,334 psi | 88% | 2759 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,624 psi | 89% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,754 psi | 89% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,697 psi | 90% | 2802 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,928 psi | 89% | 2808 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,940 psi | 85% | 2720 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,854 psi | 86% | 2736 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,058 psi | 88% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,914 psi | 89% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,217 psi | 88% | 2713 fps | 99.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,809 psi | 83% | 2795 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 56,434 psi | 87% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,407 psi | 90% | 2756 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,173 psi | 86% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 55,999 psi | 86% | 2740 fps | 96.3% |
| Somchem S365 | <<locked>> | 98% | 56,159 psi | 86% | 2822 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 2776 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 84% | 57,537 psi | 89% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,927 psi | 88% | 2664 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,145 psi | 88% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,885 psi | 89% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,811 psi | 86% | 2766 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,282 psi | 73% | 2644 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 82% | 56,449 psi | 87% | 2707 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,347 psi | 85% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,508 psi | 90% | 2822 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,053 psi | 79% | 2772 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 52,054 psi | 80% | 2822 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,651 psi | 86% | 2736 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,261 psi | 88% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,609 psi | 89% | 2841 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,988 psi | 63% | 2740 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,883 psi | 86% | 2743 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,256 psi | 79% | 2713 fps | 97.3% |
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% | 54,491 psi | 84% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,094 psi | 72% | 2539 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,861 psi | 71% | 2543 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 34,127 psi | 53% | 2405 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 44,643 psi | 69% | 2543 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,286 psi | 51% | 2398 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,430 psi | 78% | 2661 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,888 psi | 66% | 2520 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 43,033 psi | 66% | 2602 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,591 psi | 81% | 2657 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,244 psi | 83% | 2631 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,731 psi | 72% | 2717 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,989 psi | 66% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,963 psi | 71% | 2605 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,373 psi | 51% | 2418 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,434 psi | 58% | 2536 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,482 psi | 65% | 2595 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 42,351 psi | 65% | 2638 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,498 psi | 39% | 2221 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,895 psi | 51% | 2441 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,285 psi | 48% | 2444 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,140 psi | 77% | 2677 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 41,742 psi | 64% | 2625 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 42,859 psi | 66% | 2549 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 42,351 psi | 65% | 2638 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 38,130 psi | 59% | 2425 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,911 psi | 83% | 2638 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,098 psi | 80% | 2687 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,511 psi | 67% | 2559 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 38,130 psi | 59% | 2503 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 82% | 41,423 psi | 64% | 2526 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 50,256 psi | 77% | 2707 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 50,966 psi | 78% | 2667 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,748 psi | 47% | 2316 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,471 psi | 73% | 2651 fps | 100% |
| Hodgdon Superformance | 51.9 gr | 84% | 40,001 psi | 62% | 2572 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 41% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,979 psi | 75% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,401 psi | 79% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,049 psi | 69% | 2552 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,572 psi | 73% | 2582 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 38,682 psi | 60% | 2457 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,726 psi | 61% | 2457 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 32,314 psi | 50% | 2356 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 47,123 psi | 72% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 49,153 psi | 76% | 2654 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 52,591 psi | 81% | 2657 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,343 psi | 77% | 2638 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,850 psi | 77% | 2592 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,049 psi | 69% | 2549 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,130 psi | 57% | 2411 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 37,463 psi | 58% | 2434 fps | 95.7% |
| Lovex S071 | <<locked>> | 94% | 32,866 psi | 51% | 2375 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,371 psi | 76% | 2608 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,922 psi | 77% | 2608 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,310 psi | 70% | 2592 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 43,729 psi | 67% | 2598 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 38,783 psi | 60% | 2595 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,547 psi | 52% | 2398 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 45,382 psi | 70% | 2615 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 34,896 psi | 54% | 2441 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 52,562 psi | 81% | 2684 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,649 psi | 81% | 2700 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 42% | 1529 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,700 psi | 67% | 2543 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,530 psi | 76% | 2720 fps | 100% |
| ReloadSwiss RS 60 | 46.8 gr | 80% | 39,856 psi | 61% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,272 psi | 51% | 2418 fps | 96.7% |
| ReloadSwiss RS 70 | 47.5 gr | 80% | 32,663 psi | 50% | 2418 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 53,243 psi | 82% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,818 psi | 72% | 2562 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,248 psi | 62% | 2497 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 47,761 psi | 73% | 2638 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 41,278 psi | 64% | 2575 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 38,130 psi | 59% | 2425 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,130 psi | 57% | 2411 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,343 psi | 77% | 2638 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,049 psi | 69% | 2549 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,463 psi | 58% | 2434 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,611 psi | 64% | 2552 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,256 psi | 79% | 2664 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,081 psi | 76% | 2635 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,415 psi | 78% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,351 psi | 65% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,172 psi | 56% | 2352 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 40,901 psi | 63% | 2569 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,154 psi | 77% | 2549 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,981 psi | 78% | 2654 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,031 psi | 63% | 2500 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 52,359 psi | 81% | 2684 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 30,153 psi | 46% | 2356 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 39,160 psi | 60% | 2503 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 50,981 psi | 78% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,978 psi | 72% | 2530 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,224 psi | 73% | 2543 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,928 psi | 60% | 2434 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,998 psi | 54% | 2402 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 41,191 psi | 63% | 2533 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 52,939 psi | 81% | 2657 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,614 psi | 70% | 2539 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,505 psi | 53% | 2402 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 27,659 psi | 43% | 2293 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 98% | 48,472 psi | 75% | 2759 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,374 psi | 53% | 2379 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 53,388 psi | 82% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,377 psi | 59% | 2510 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 25,527 psi | 39% | 2300 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,689 psi | 75% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,730 psi | 69% | 2602 fps | 95.8% |
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 121 powders for .280 Ackley Improved loaded with the .284 | 160gr | Hornady CX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,890 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,890 fps. Accurate 3100 gives the best case fill at 100 %, and 121 of the 121 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 160gr | Hornady CX they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Bofors RP30 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.