Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 170gr | Norma VULKAN bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 56,420 psi | 87% | 2664 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 55,448 psi | 85% | 2720 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,130 psi | 86% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,392 psi | 88% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,450 psi | 88% | 2861 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 84% | 55,695 psi | 86% | 2674 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,957 psi | 89% | 2805 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 98% | 55,593 psi | 86% | 2808 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,334 psi | 59% | 2543 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,884 psi | 88% | 2694 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,956 psi | 88% | 2717 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,189 psi | 90% | 2812 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,550 psi | 85% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,537 psi | 89% | 2799 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,955 psi | 85% | 2802 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2779 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,414 psi | 74% | 2730 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,333 psi | 87% | 2871 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 2769 fps | 95.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,867 psi | 83% | 2785 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,899 psi | 89% | 2713 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,193 psi | 68% | 2654 fps | 96.6% |
| Bofors RP5 | <<locked>> | 98% | 54,955 psi | 85% | 2802 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 56,956 psi | 88% | 2710 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 2674 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 84% | 58,247 psi | 90% | 2736 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,637 psi | 86% | 2756 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 58,784 psi | 90% | 2772 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 96% | 55,854 psi | 86% | 2753 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 58,363 psi | 90% | 2789 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,508 psi | 90% | 2733 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,239 psi | 73% | 2772 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 55,738 psi | 86% | 2795 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 57% | 1670 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,697 psi | 90% | 2700 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,595 psi | 89% | 2694 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 58,088 psi | 89% | 2743 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,363 psi | 90% | 2730 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,783 psi | 89% | 2749 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,421 psi | 90% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,043 psi | 88% | 2736 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,058 psi | 88% | 2841 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 55,753 psi | 86% | 2651 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,798 psi | 90% | 2726 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,797 psi | 87% | 2723 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,385 psi | 76% | 2631 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 56,275 psi | 87% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,419 psi | 85% | 2746 fps | 99% |
| Norma MRP | <<locked>> | 98% | 58,784 psi | 90% | 2884 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,840 psi | 86% | 2740 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,261 psi | 88% | 2730 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,609 psi | 89% | 2861 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 58,102 psi | 89% | 2795 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,663 psi | 79% | 2740 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 58% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,841 psi | 89% | 2720 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,940 psi | 85% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,159 psi | 88% | 2779 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,550 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,253 psi | 73% | 2769 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,406 psi | 88% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 58,088 psi | 89% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,898 psi | 86% | 2723 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 56,753 psi | 87% | 2782 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,956 psi | 88% | 2710 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,798 psi | 90% | 2726 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,753 psi | 86% | 2651 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,797 psi | 87% | 2723 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,869 psi | 86% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,421 psi | 90% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,349 psi | 90% | 2684 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,318 psi | 87% | 2779 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,711 psi | 89% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,711 psi | 89% | 2723 fps | 97.9% |
| Somchem S365 | <<locked>> | 92% | 55,579 psi | 86% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,392 psi | 88% | 2759 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 58,073 psi | 89% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,218 psi | 90% | 2631 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,550 psi | 85% | 2631 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,870 psi | 89% | 2733 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,753 psi | 87% | 2740 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 56,246 psi | 87% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,942 psi | 88% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,378 psi | 90% | 2805 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 58,813 psi | 90% | 2881 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,575 psi | 78% | 2740 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,450 psi | 88% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,637 psi | 86% | 2756 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,996 psi | 80% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,435 psi | 88% | 2753 fps | 99.2% |
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 2700 | <<locked>> | 80% | 52,794 psi | 81% | 2612 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 30,240 psi | 47% | 2254 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 52,736 psi | 81% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,901 psi | 63% | 2497 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 46,789 psi | 72% | 2687 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,472 psi | 76% | 2579 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,363 psi | 61% | 2484 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 42,656 psi | 66% | 2579 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 33,910 psi | 52% | 2431 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,212 psi | 77% | 2602 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,548 psi | 82% | 2667 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,392 psi | 61% | 2503 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,078 psi | 69% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,044 psi | 60% | 2474 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,883 psi | 57% | 2470 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,109 psi | 45% | 2280 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,095 psi | 45% | 2293 fps | 95.1% |
| Alliant Reloder-26 | 52.5 gr | 80% | 31,343 psi | 48% | 2395 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,534 psi | 84% | 2717 fps | 95% |
| Bofors RP15 | <<locked>> | 90% | 39,030 psi | 60% | 2516 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,749 psi | 78% | 2615 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,408 psi | 64% | 2598 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,883 psi | 57% | 2470 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,411 psi | 68% | 2503 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 41,684 psi | 64% | 2556 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 51,111 psi | 79% | 2631 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,757 psi | 66% | 2543 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 45,411 psi | 70% | 2556 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 45,730 psi | 70% | 2589 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,759 psi | 69% | 2569 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,101 psi | 57% | 2398 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,521 psi | 56% | 2530 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,582 psi | 64% | 2556 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 42% | 1490 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,069 psi | 80% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,201 psi | 83% | 2644 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 39,929 psi | 61% | 2438 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,730 psi | 70% | 2530 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 39,189 psi | 60% | 2451 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,926 psi | 85% | 2690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,643 psi | 69% | 2530 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 43,729 psi | 67% | 2612 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 52,402 psi | 81% | 2602 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,265 psi | 67% | 2480 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,669 psi | 64% | 2470 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 29,747 psi | 46% | 2238 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,881 psi | 81% | 2654 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,552 psi | 61% | 2467 fps | 95.6% |
| Norma MRP | 52.2 gr | 82% | 33,707 psi | 52% | 2425 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 40,495 psi | 62% | 2490 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,563 psi | 82% | 2680 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,453 psi | 67% | 2621 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 39,233 psi | 60% | 2480 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,853 psi | 55% | 2441 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 43% | 1529 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,923 psi | 78% | 2618 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,863 psi | 74% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,596 psi | 62% | 2513 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,189 psi | 60% | 2526 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,475 psi | 51% | 2451 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 53,983 psi | 83% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,008 psi | 74% | 2566 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,424 psi | 67% | 2516 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 38,189 psi | 59% | 2457 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,411 psi | 68% | 2503 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,265 psi | 67% | 2480 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 52,402 psi | 81% | 2602 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,669 psi | 64% | 2470 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,095 psi | 76% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,544 psi | 75% | 2461 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,395 psi | 65% | 2434 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,840 psi | 58% | 2454 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 47,892 psi | 74% | 2559 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,353 psi | 68% | 2507 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,999 psi | 57% | 2448 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,069 psi | 52% | 2339 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 54,505 psi | 84% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,708 psi | 84% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,934 psi | 71% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,814 psi | 64% | 2484 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,969 psi | 55% | 2379 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,910 psi | 81% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,321 psi | 64% | 2490 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,430 psi | 50% | 2352 fps | 98.4% |
| Vihtavuori N560 | 57.3 gr | 90% | 44,715 psi | 69% | 2644 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 43,961 psi | 68% | 2621 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,727 psi | 63% | 2454 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,757 psi | 66% | 2543 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,802 psi | 40% | 2274 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,189 psi | 59% | 2431 fps | 95.3% |
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 90 powders for .280 Ackley Improved loaded with the .284 | 170gr | Norma VULKAN. Norma MRP delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,884 fps. ADI AR 2225 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .280 Ackley Improved with the .284 | 170gr | Norma VULKAN 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.