Load Specifications
Bullet Manufacturer:Frontier Bullets
Bullet Weight:155 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:1:9.5
Load data in caliber .280 Ackley Improved with .284 | 155gr | Frontier PH HPFB bullet and 112 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, 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.
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 2495 | <<locked>> | 84% | 56,463 psi | 87% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,914 psi | 89% | 2782 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,271 psi | 79% | 2762 fps | 99.3% |
| Accurate 4064 | <<locked>> | 86% | 56,942 psi | 88% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,377 psi | 88% | 2871 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,825 psi | 86% | 2792 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,956 psi | 88% | 2795 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,479 psi | 90% | 2913 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,286 psi | 80% | 2841 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 58,015 psi | 89% | 2785 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,362 psi | 87% | 2920 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2907 fps | 98.5% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2907 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,798 psi | 89% | 2818 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 58,218 psi | 90% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 58,001 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,869 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,464 psi | 88% | 2897 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2841 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,022 psi | 74% | 2782 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,090 psi | 65% | 2703 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,216 psi | 85% | 2976 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,912 psi | 86% | 2812 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,862 psi | 72% | 2766 fps | 96.4% |
| Bofors RP3 | <<locked>> | 88% | 58,813 psi | 90% | 2838 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2841 fps | 97.5% |
| Bofors RP7 | <<locked>> | 92% | 58,160 psi | 89% | 2825 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 82% | 58,059 psi | 89% | 2818 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,376 psi | 85% | 2802 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,130 psi | 86% | 2871 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 56,072 psi | 86% | 2831 fps | 98.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2848 fps | 96.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,897 psi | 84% | 2831 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 56,478 psi | 87% | 2802 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 58,436 psi | 90% | 2844 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,826 psi | 87% | 2838 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,275 psi | 87% | 2907 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 56% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,493 psi | 88% | 2802 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,174 psi | 88% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,608 psi | 87% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,898 psi | 86% | 2766 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 55,216 psi | 85% | 2799 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,333 psi | 87% | 2799 fps | 99.2% |
| IMR 4831 | <<locked>> | 96% | 57,696 psi | 89% | 2858 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,985 psi | 86% | 2818 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,899 psi | 89% | 2841 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 82% | 58,015 psi | 89% | 2785 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,362 psi | 87% | 2766 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 58,349 psi | 90% | 2766 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,681 psi | 87% | 2772 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,217 psi | 86% | 2795 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 57,363 psi | 88% | 2831 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,511 psi | 65% | 2615 fps | 97.9% |
| Norma 201 | <<locked>> | 84% | 58,073 psi | 89% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,187 psi | 85% | 2730 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,464 psi | 88% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,043 psi | 86% | 2854 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 54,302 psi | 84% | 2930 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 55,956 psi | 86% | 2854 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 58,146 psi | 89% | 2854 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,879 psi | 77% | 2825 fps | 96% |
| Ramshot Hunter | <<locked>> | 96% | 58,479 psi | 90% | 2910 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,338 psi | 68% | 2700 fps | 96.5% |
| Ramshot TAC | <<locked>> | 82% | 58,363 psi | 90% | 2818 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 58,392 psi | 90% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 57% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,579 psi | 86% | 2789 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,463 psi | 85% | 2858 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,216 psi | 85% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,130 psi | 88% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,825 psi | 86% | 2923 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,031 psi | 63% | 2713 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 82% | 58,798 psi | 90% | 2756 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,245 psi | 85% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,653 psi | 90% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,405 psi | 87% | 2825 fps | 97.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,855 psi | 87% | 2887 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 92% | 58,160 psi | 89% | 2825 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,217 psi | 86% | 2795 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,362 psi | 87% | 2766 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,681 psi | 87% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,363 psi | 88% | 2831 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,681 psi | 87% | 2841 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,116 psi | 88% | 2799 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,943 psi | 89% | 2815 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,506 psi | 85% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,246 psi | 87% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,072 psi | 86% | 2749 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,347 psi | 87% | 2881 fps | 98.4% |
| Somchem S335 | <<locked>> | 84% | 58,566 psi | 90% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,942 psi | 88% | 2785 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,465 psi | 90% | 2825 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,595 psi | 90% | 2825 fps | 96.7% |
| Somchem S365 | <<locked>> | 98% | 58,726 psi | 90% | 2904 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,290 psi | 88% | 2861 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 55,956 psi | 86% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,492 psi | 85% | 2697 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,014 psi | 86% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,376 psi | 87% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 58,291 psi | 90% | 2848 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 2726 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 82% | 58,523 psi | 90% | 2782 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,421 psi | 88% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,363 psi | 88% | 2854 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,012 psi | 83% | 2861 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 2917 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 58,160 psi | 89% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,130 psi | 86% | 2871 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,395 psi | 67% | 2835 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,943 psi | 89% | 2822 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2799 fps | 97.7% |
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 2495 | <<locked>> | 80% | 49,617 psi | 76% | 2618 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,747 psi | 73% | 2621 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 34,098 psi | 52% | 2438 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 47,021 psi | 72% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,694 psi | 55% | 2490 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 80% | 52,620 psi | 81% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,643 psi | 69% | 2598 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,179 psi | 70% | 2690 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 49,124 psi | 76% | 2785 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,694 psi | 84% | 2740 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,921 psi | 75% | 2805 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,351 psi | 65% | 2631 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,351 psi | 65% | 2631 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,976 psi | 69% | 2621 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,182 psi | 74% | 2690 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,911 psi | 54% | 2493 fps | 97.7% |
| Alliant Reloder-17 | 48.9 gr | 80% | 39,320 psi | 60% | 2618 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,657 psi | 69% | 2680 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,843 psi | 64% | 2671 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,527 psi | 39% | 2254 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,837 psi | 51% | 2477 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 84% | 31,125 psi | 48% | 2477 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,170 psi | 80% | 2756 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 43,859 psi | 67% | 2710 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 45,281 psi | 70% | 2635 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,843 psi | 64% | 2671 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,972 psi | 61% | 2503 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,418 psi | 84% | 2766 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,658 psi | 70% | 2644 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 37,666 psi | 58% | 2533 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 43,236 psi | 67% | 2608 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 98% | 52,417 psi | 81% | 2789 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,547 psi | 79% | 2776 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 53,243 psi | 82% | 2753 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,416 psi | 50% | 2395 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,545 psi | 76% | 2733 fps | 100% |
| Hodgdon Superformance | 53 gr | 82% | 39,204 psi | 60% | 2595 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 1535 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,720 psi | 78% | 2700 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,708 psi | 83% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,963 psi | 72% | 2631 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,168 psi | 76% | 2657 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 40,422 psi | 62% | 2536 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,365 psi | 64% | 2536 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 34,229 psi | 53% | 2441 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 49,371 psi | 76% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,140 psi | 79% | 2736 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 54,694 psi | 84% | 2740 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,765 psi | 81% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,634 psi | 79% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,152 psi | 73% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,783 psi | 60% | 2487 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 37,014 psi | 57% | 2464 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 35,099 psi | 54% | 2464 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 51,271 psi | 79% | 2687 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,996 psi | 80% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,558 psi | 73% | 2677 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,815 psi | 66% | 2625 fps | 95% |
| Norma MRP | <<locked>> | 90% | 38,479 psi | 59% | 2628 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,462 psi | 55% | 2480 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 47,543 psi | 73% | 2694 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,441 psi | 71% | 2759 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 34,519 psi | 53% | 2467 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 41,336 psi | 64% | 2641 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 54,549 psi | 84% | 2762 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,520 psi | 84% | 2776 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 42% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,585 psi | 70% | 2621 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,822 psi | 80% | 2802 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,800 psi | 64% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,302 psi | 54% | 2503 fps | 97.2% |
| ReloadSwiss RS 70 | 49.7 gr | 80% | 34,519 psi | 53% | 2507 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,189 psi | 59% | 2644 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 55,448 psi | 85% | 2710 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 49,023 psi | 75% | 2644 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,424 psi | 65% | 2579 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,789 psi | 72% | 2667 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 43,439 psi | 67% | 2661 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 39,972 psi | 61% | 2503 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,783 psi | 60% | 2487 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,765 psi | 81% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,152 psi | 73% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,014 psi | 57% | 2464 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,613 psi | 67% | 2631 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,519 psi | 82% | 2746 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,010 psi | 78% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,199 psi | 80% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,034 psi | 68% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,130 psi | 59% | 2434 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,047 psi | 66% | 2654 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 51,851 psi | 80% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,098 psi | 82% | 2733 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,830 psi | 66% | 2579 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,271 psi | 79% | 2713 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,024 psi | 49% | 2441 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 38,885 psi | 60% | 2539 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 52,721 psi | 81% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,008 psi | 75% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,153 psi | 76% | 2618 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,843 psi | 63% | 2510 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,043 psi | 57% | 2487 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,698 psi | 63% | 2566 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 55,085 psi | 85% | 2740 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,659 psi | 73% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,463 psi | 56% | 2487 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,804 psi | 43% | 2329 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 50,952 psi | 78% | 2854 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,143 psi | 56% | 2454 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,666 psi | 58% | 2533 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,643 psi | 39% | 2333 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,923 psi | 78% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,888 psi | 68% | 2631 fps | 95.5% |
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 112 powders for .280 Ackley Improved loaded with the .284 | 155gr | Frontier PH HPFB. Alliant Reloder-26 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,976 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:9.5 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 155gr | Frontier PH HPFB 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.