Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 160gr | NorthFork Bonded Core bullet and 104 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 Alliant Reloder-16.
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 2495 | <<locked>> | 84% | 58,494 psi | 90% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,985 psi | 86% | 2720 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2762 fps | 99.7% |
| Accurate 4064 | <<locked>> | 86% | 58,639 psi | 90% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,956 psi | 86% | 2808 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,593 psi | 86% | 2900 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 82% | 57,624 psi | 89% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,711 psi | 90% | 2782 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,826 psi | 87% | 2854 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2844 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,450 psi | 90% | 2910 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,028 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,405 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,521 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 58,073 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,985 psi | 86% | 2838 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,156 psi | 82% | 2841 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,241 psi | 77% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,888 psi | 68% | 2707 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 2972 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,769 psi | 89% | 2799 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,921 psi | 75% | 2769 fps | 97.4% |
| Bofors RP3 | <<locked>> | 86% | 57,014 psi | 88% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,156 psi | 82% | 2841 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 56,188 psi | 86% | 2759 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 86% | 57,217 psi | 88% | 2789 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,117 psi | 89% | 2861 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 57,885 psi | 89% | 2822 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2848 fps | 97.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2828 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 58,291 psi | 90% | 2785 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,913 psi | 88% | 2785 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,798 psi | 90% | 2825 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,844 psi | 66% | 2733 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 92% | 58,682 psi | 90% | 2904 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 56% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,608 psi | 86% | 2736 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,363 psi | 90% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,551 psi | 89% | 2756 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 57,319 psi | 88% | 2795 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,001 psi | 89% | 2789 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 56,231 psi | 87% | 2802 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,899 psi | 89% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,188 psi | 86% | 2779 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,692 psi | 80% | 2815 fps | 96.6% |
| Lovex D073.6 | <<locked>> | 82% | 58,363 psi | 90% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,347 psi | 87% | 2700 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,552 psi | 90% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,957 psi | 89% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,840 psi | 86% | 2776 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,570 psi | 69% | 2618 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 56,217 psi | 86% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,000 psi | 88% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,695 psi | 86% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,262 psi | 90% | 2848 fps | 98.7% |
| Norma MRPᴾ | <<locked>> | 100% | 56,753 psi | 87% | 2927 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 58,305 psi | 90% | 2848 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,405 psi | 87% | 2792 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,938 psi | 80% | 2831 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 57,029 psi | 88% | 2851 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,557 psi | 72% | 2713 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 57% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,305 psi | 88% | 2779 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,580 psi | 89% | 2848 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,696 psi | 89% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,796 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,146 psi | 89% | 2917 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,757 psi | 66% | 2726 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 56,985 psi | 88% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,188 psi | 88% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,552 psi | 90% | 2822 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 55,332 psi | 85% | 2828 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 56,188 psi | 86% | 2759 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,957 psi | 89% | 2782 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,363 psi | 90% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,552 psi | 90% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,840 psi | 86% | 2776 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,595 psi | 90% | 2825 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,159 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,203 psi | 88% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,957 psi | 89% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,769 psi | 89% | 2740 fps | 99.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2874 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 56,652 psi | 87% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,769 psi | 90% | 2772 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,927 psi | 88% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,637 psi | 87% | 2762 fps | 96.8% |
| Somchem S365 | <<locked>> | 96% | 57,392 psi | 88% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,840 psi | 86% | 2802 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 57,740 psi | 89% | 2631 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,406 psi | 88% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,508 psi | 88% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,218 psi | 90% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,768 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,692 psi | 80% | 2726 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,608 psi | 86% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,883 psi | 86% | 2795 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 2851 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,043 psi | 88% | 2917 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,318 psi | 87% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,436 psi | 90% | 2867 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,411 psi | 70% | 2835 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,159 psi | 86% | 2756 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2799 fps | 98.4% |
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% | 51,503 psi | 79% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,284 psi | 76% | 2615 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 33,257 psi | 51% | 2385 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 48,776 psi | 75% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,115 psi | 57% | 2484 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 98% | 51,938 psi | 80% | 2841 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 54,085 psi | 83% | 2726 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,934 psi | 71% | 2585 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,988 psi | 63% | 2572 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 47,471 psi | 73% | 2723 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,778 psi | 78% | 2795 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,383 psi | 71% | 2608 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,588 psi | 76% | 2674 fps | 100% |
| Alliant Reloder-16 | 45.9 gr | 80% | 36,274 psi | 56% | 2497 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,944 psi | 63% | 2615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,669 psi | 63% | 2569 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,901 psi | 63% | 2618 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,600 psi | 41% | 2260 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,952 psi | 49% | 2425 fps | 95.3% |
| Alliant Reloder-26 | 51.9 gr | 82% | 30,226 psi | 47% | 2421 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,925 psi | 83% | 2746 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,350 psi | 62% | 2605 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,731 psi | 72% | 2621 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,901 psi | 63% | 2618 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,133 psi | 63% | 2497 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 47,065 psi | 72% | 2631 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 38,957 psi | 60% | 2526 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 41,974 psi | 65% | 2549 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 50,981 psi | 78% | 2736 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,821 psi | 77% | 2717 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 54,665 psi | 84% | 2733 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,823 psi | 52% | 2395 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,343 psi | 79% | 2720 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,147 psi | 62% | 2667 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 37,869 psi | 58% | 2536 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,417 psi | 81% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,298 psi | 74% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,691 psi | 78% | 2648 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 36,985 psi | 57% | 2431 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,482 psi | 65% | 2526 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 35,694 psi | 55% | 2441 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 50,850 psi | 78% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,777 psi | 77% | 2677 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 48,573 psi | 75% | 2759 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 80% | 54,346 psi | 84% | 2700 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,895 psi | 81% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,559 psi | 75% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,176 psi | 62% | 2480 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,392 psi | 59% | 2464 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 32,343 psi | 50% | 2362 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,968 psi | 81% | 2671 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,432 psi | 82% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,994 psi | 75% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,568 psi | 64% | 2566 fps | 95.1% |
| Norma MRP | <<locked>> | 88% | 37,449 psi | 58% | 2572 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,956 psi | 57% | 2480 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,313 psi | 76% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,223 psi | 70% | 2707 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,694 psi | 55% | 2464 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 40,248 psi | 62% | 2589 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 43% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,137 psi | 73% | 2618 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,548 psi | 82% | 2789 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,511 psi | 67% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,912 psi | 57% | 2503 fps | 98.1% |
| ReloadSwiss RS 70 | 50.2 gr | 80% | 35,810 psi | 55% | 2507 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,086 psi | 57% | 2592 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 50,372 psi | 77% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,077 psi | 68% | 2572 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,571 psi | 70% | 2612 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 39,682 psi | 61% | 2549 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,133 psi | 63% | 2497 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,176 psi | 62% | 2480 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,346 psi | 84% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,559 psi | 75% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,392 psi | 59% | 2464 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,020 psi | 69% | 2621 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,417 psi | 81% | 2697 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,838 psi | 83% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,542 psi | 70% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,262 psi | 60% | 2428 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,061 psi | 65% | 2602 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,461 psi | 82% | 2605 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,839 psi | 84% | 2720 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,440 psi | 68% | 2572 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,647 psi | 76% | 2654 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,504 psi | 52% | 2441 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,869 psi | 58% | 2484 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 54,404 psi | 84% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,836 psi | 78% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,836 psi | 78% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,351 psi | 65% | 2503 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,319 psi | 59% | 2477 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,755 psi | 61% | 2516 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 48,994 psi | 75% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,724 psi | 58% | 2480 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,196 psi | 45% | 2333 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 49,690 psi | 76% | 2795 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,449 psi | 58% | 2451 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,175 psi | 60% | 2533 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,048 psi | 39% | 2287 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,663 psi | 81% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,525 psi | 65% | 2575 fps | 95.6% |
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 110 powders for .280 Ackley Improved loaded with the .284 | 160gr | NorthFork Bonded Core. Alliant Reloder-26 delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,972 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:10.0 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, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 160gr | NorthFork Bonded Core 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.