Load Specifications
Bullet:.284 | 170gr | CutEdge MTH
Bullet Manufacturer:Cutting Edge
Bullet Weight:170 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:1:9.0
Load data in caliber .280 Ackley Improved with .284 | 170gr | CutEdge MTH bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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 2495 | <<locked>> | 84% | 57,450 psi | 88% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,492 psi | 85% | 2631 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,968 psi | 81% | 2674 fps | 99.8% |
| Accurate 4064 | <<locked>> | 86% | 57,812 psi | 89% | 2651 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,230 psi | 85% | 2717 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,317 psi | 85% | 2815 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 82% | 57,174 psi | 88% | 2684 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,610 psi | 90% | 2694 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,449 psi | 87% | 2766 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,099 psi | 83% | 2762 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,320 psi | 90% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,680 psi | 86% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,043 psi | 86% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,449 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,841 psi | 89% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,622 psi | 86% | 2753 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,852 psi | 81% | 2759 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2687 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,395 psi | 67% | 2625 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,363 psi | 88% | 2877 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,421 psi | 88% | 2710 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,515 psi | 75% | 2687 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 56,289 psi | 87% | 2680 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,852 psi | 81% | 2759 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 55,753 psi | 86% | 2671 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 57,014 psi | 88% | 2703 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,812 psi | 89% | 2772 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 57,435 psi | 88% | 2733 fps | 99.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,247 psi | 90% | 2766 fps | 97.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,869 psi | 87% | 2746 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 57,841 psi | 89% | 2694 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,536 psi | 87% | 2697 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,465 psi | 90% | 2733 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,424 psi | 65% | 2654 fps | 97% |
| Hodgdon Superformance | <<locked>> | 92% | 58,262 psi | 90% | 2815 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 56% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,535 psi | 85% | 2651 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,610 psi | 90% | 2664 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,073 psi | 89% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,029 psi | 88% | 2664 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 56,985 psi | 88% | 2710 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,783 psi | 89% | 2700 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 55,767 psi | 86% | 2710 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,522 psi | 88% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,796 psi | 86% | 2697 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,401 psi | 79% | 2733 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 82% | 57,522 psi | 88% | 2657 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,883 psi | 86% | 2612 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,117 psi | 89% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,595 psi | 89% | 2694 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,187 psi | 85% | 2684 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,859 psi | 67% | 2533 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 55,767 psi | 86% | 2628 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,753 psi | 87% | 2625 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,813 psi | 90% | 2723 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,812 psi | 89% | 2762 fps | 98.9% |
| Norma MRPᴾ | <<locked>> | 100% | 56,362 psi | 87% | 2841 fps | 99.8% |
| Norma URP | <<locked>> | 94% | 57,856 psi | 89% | 2756 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,115 psi | 86% | 2703 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,837 psi | 80% | 2749 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 56,565 psi | 87% | 2762 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,832 psi | 71% | 2628 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 57% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,985 psi | 88% | 2690 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,971 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,348 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,143 psi | 85% | 2743 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,595 psi | 89% | 2825 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,119 psi | 65% | 2644 fps | 98% |
| Rottweil R 902 | <<locked>> | 84% | 56,318 psi | 87% | 2628 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,507 psi | 87% | 2677 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,117 psi | 89% | 2736 fps | 98.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,595 psi | 90% | 2792 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,753 psi | 86% | 2671 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,595 psi | 89% | 2694 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,522 psi | 88% | 2657 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,117 psi | 89% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,187 psi | 85% | 2684 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,421 psi | 90% | 2740 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,479 psi | 90% | 2697 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,593 psi | 86% | 2661 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,797 psi | 87% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,638 psi | 89% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,276 psi | 88% | 2651 fps | 99.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 2789 fps | 99.2% |
| Somchem S335 | <<locked>> | 82% | 56,304 psi | 87% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,392 psi | 90% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,304 psi | 87% | 2671 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,449 psi | 87% | 2684 fps | 97.2% |
| Somchem S365 | <<locked>> | 96% | 57,116 psi | 88% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,303 psi | 85% | 2713 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 82% | 57,392 psi | 88% | 2543 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,072 psi | 88% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,116 psi | 88% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,812 psi | 89% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,289 psi | 87% | 2697 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,314 psi | 79% | 2644 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 84% | 55,303 psi | 85% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,463 psi | 85% | 2707 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 2762 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,710 psi | 87% | 2831 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,985 psi | 86% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,812 psi | 89% | 2772 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,773 psi | 69% | 2746 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,970 psi | 86% | 2671 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,869 psi | 86% | 2717 fps | 98.8% |
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% | 50,473 psi | 78% | 2510 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,820 psi | 75% | 2530 fps | 98.3% |
| Accurate 3100 | <<locked>> | 86% | 32,547 psi | 50% | 2306 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 47,906 psi | 74% | 2520 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,434 psi | 56% | 2402 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 47,659 psi | 73% | 2690 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 53,795 psi | 83% | 2638 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,527 psi | 70% | 2500 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,727 psi | 63% | 2497 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 44,063 psi | 68% | 2585 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,618 psi | 78% | 2710 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,905 psi | 71% | 2523 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,240 psi | 76% | 2589 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,810 psi | 55% | 2415 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,509 psi | 62% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,205 psi | 62% | 2487 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,350 psi | 62% | 2536 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,933 psi | 40% | 2182 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,401 psi | 48% | 2349 fps | 95.8% |
| Alliant Reloder-26 | 50.2 gr | 82% | 29,515 psi | 45% | 2339 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,461 psi | 82% | 2654 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 39,798 psi | 61% | 2523 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,195 psi | 71% | 2536 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,350 psi | 62% | 2536 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 40,611 psi | 62% | 2415 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 46,688 psi | 72% | 2549 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,638 psi | 59% | 2451 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,684 psi | 64% | 2470 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 47,355 psi | 73% | 2598 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,238 psi | 71% | 2579 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 54,404 psi | 84% | 2648 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,257 psi | 51% | 2313 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,010 psi | 78% | 2631 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,595 psi | 61% | 2589 fps | 96% |
| Hodgdon Superformance | 50.5 gr | 80% | 37,391 psi | 58% | 2457 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 42% | 1463 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,924 psi | 80% | 2598 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,940 psi | 85% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,906 psi | 74% | 2533 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,227 psi | 77% | 2562 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 36,376 psi | 56% | 2349 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,134 psi | 65% | 2448 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 35,143 psi | 54% | 2359 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 50,531 psi | 78% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,195 psi | 71% | 2543 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 44,889 psi | 69% | 2615 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 54,027 psi | 83% | 2612 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,605 psi | 81% | 2566 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,979 psi | 74% | 2526 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,595 psi | 61% | 2402 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 37,811 psi | 58% | 2382 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 31,575 psi | 49% | 2283 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,402 psi | 81% | 2582 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,055 psi | 82% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,602 psi | 75% | 2579 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,031 psi | 63% | 2484 fps | 95.6% |
| Norma MRP | <<locked>> | 86% | 34,316 psi | 53% | 2428 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,448 psi | 56% | 2398 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 49,008 psi | 75% | 2602 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,759 psi | 69% | 2628 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 35,360 psi | 54% | 2388 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 36,782 psi | 57% | 2448 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 43% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,673 psi | 72% | 2533 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,417 psi | 82% | 2703 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,120 psi | 66% | 2579 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,318 psi | 56% | 2421 fps | 98.4% |
| ReloadSwiss RS 70 | 48.6 gr | 80% | 35,389 psi | 54% | 2431 fps | 97.8% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,651 psi | 56% | 2516 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 49,734 psi | 77% | 2536 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,468 psi | 67% | 2484 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,179 psi | 70% | 2530 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 39,363 psi | 61% | 2474 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,611 psi | 62% | 2415 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,595 psi | 61% | 2402 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,027 psi | 83% | 2612 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,979 psi | 74% | 2526 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,811 psi | 58% | 2382 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,802 psi | 69% | 2539 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,665 psi | 84% | 2644 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,286 psi | 80% | 2615 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,316 psi | 82% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,020 psi | 69% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,754 psi | 60% | 2349 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 38,986 psi | 60% | 2467 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 53,026 psi | 82% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,331 psi | 84% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,859 psi | 67% | 2484 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,139 psi | 76% | 2572 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 32,750 psi | 50% | 2356 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 37,173 psi | 57% | 2402 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 53,925 psi | 83% | 2500 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,198 psi | 77% | 2500 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,502 psi | 78% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,872 psi | 64% | 2418 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,884 psi | 58% | 2398 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 36,709 psi | 56% | 2385 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,718 psi | 75% | 2513 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,289 psi | 57% | 2398 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 28,485 psi | 44% | 2251 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 46,035 psi | 71% | 2654 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,883 psi | 57% | 2369 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 38,638 psi | 59% | 2451 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,221 psi | 37% | 2205 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,344 psi | 81% | 2621 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,131 psi | 60% | 2438 fps | 95.1% |
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 113 powders for .280 Ackley Improved loaded with the .284 | 170gr | CutEdge MTH. Alliant Reloder-26 delivers the highest muzzle velocity at 2,877 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,877 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 46–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 170gr | CutEdge MTH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.