Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 165gr | Remington SP Core-Lokt bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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>> | 82% | 58,755 psi | 90% | 2664 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,898 psi | 86% | 2697 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,508 psi | 90% | 2802 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,680 psi | 86% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,608 psi | 87% | 2789 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,623 psi | 87% | 2890 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 86% | 58,726 psi | 90% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,392 psi | 88% | 2841 fps | 99.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2894 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,855 psi | 58% | 2566 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,493 psi | 88% | 2835 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,493 psi | 88% | 2835 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,376 psi | 87% | 2730 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,478 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,087 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,740 psi | 90% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,695 psi | 87% | 2828 fps | 99.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,928 psi | 89% | 2887 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 2808 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,514 psi | 73% | 2753 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,100 psi | 85% | 2897 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2815 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 57,334 psi | 88% | 2749 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,569 psi | 67% | 2680 fps | 96.1% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,928 psi | 89% | 2887 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 56,420 psi | 87% | 2743 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,195 psi | 73% | 2697 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 84% | 57,363 psi | 88% | 2766 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,436 psi | 90% | 2841 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 58,146 psi | 89% | 2802 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 55,013 psi | 85% | 2779 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,725 psi | 89% | 2822 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,725 psi | 89% | 2766 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,813 psi | 90% | 2792 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,644 psi | 72% | 2799 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 88% | 55,129 psi | 85% | 2828 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 57% | 1699 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,218 psi | 90% | 2740 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,159 psi | 88% | 2730 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 57,377 psi | 88% | 2772 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,812 psi | 89% | 2762 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 57,000 psi | 88% | 2782 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,957 psi | 89% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,594 psi | 87% | 2769 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2867 fps | 98.2% |
| Lovex S062 | <<locked>> | 84% | 58,508 psi | 90% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,160 psi | 89% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,115 psi | 86% | 2753 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,602 psi | 75% | 2657 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 55,767 psi | 86% | 2740 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,523 psi | 90% | 2831 fps | 99.1% |
| Norma MRP | <<locked>> | 98% | 57,943 psi | 89% | 2917 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 58,682 psi | 90% | 2822 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,652 psi | 87% | 2766 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,768 psi | 87% | 2887 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 92% | 57,580 psi | 89% | 2831 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,879 psi | 78% | 2766 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 58% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,217 psi | 88% | 2753 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,175 psi | 89% | 2848 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,275 psi | 87% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,595 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,789 psi | 72% | 2795 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,739 psi | 87% | 2690 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,508 psi | 88% | 2746 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,158 psi | 85% | 2753 fps | 98% |
| Rottweil R 905 | <<locked>> | 96% | 55,912 psi | 86% | 2812 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 56,420 psi | 87% | 2743 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,160 psi | 89% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,508 psi | 90% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,115 psi | 86% | 2753 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,259 psi | 85% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,682 psi | 89% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,711 psi | 89% | 2717 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,448 psi | 85% | 2808 fps | 99% |
| Somchem S355 | <<locked>> | 86% | 57,203 psi | 88% | 2740 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,855 psi | 87% | 2749 fps | 97.5% |
| Somchem S365 | <<locked>> | 94% | 58,421 psi | 90% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,550 psi | 87% | 2789 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,406 psi | 88% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,464 psi | 88% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,508 psi | 90% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,159 psi | 88% | 2766 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 2769 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 55,724 psi | 86% | 2664 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,217 psi | 86% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,421 psi | 88% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,986 psi | 89% | 2907 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 2759 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,608 psi | 87% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,740 psi | 90% | 2844 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,981 psi | 78% | 2884 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,753 psi | 87% | 2785 fps | 99% |
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% | 55,158 psi | 85% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,301 psi | 80% | 2644 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 31,894 psi | 49% | 2326 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 52,330 psi | 81% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,234 psi | 62% | 2523 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 94% | 49,240 psi | 76% | 2769 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,878 psi | 75% | 2612 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,725 psi | 60% | 2503 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 44,846 psi | 69% | 2657 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 98% | 35,621 psi | 55% | 2507 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,972 psi | 60% | 2507 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,972 psi | 60% | 2507 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,574 psi | 76% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,837 psi | 81% | 2700 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,856 psi | 60% | 2530 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,266 psi | 68% | 2644 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,580 psi | 59% | 2500 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,001 psi | 60% | 2552 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,790 psi | 44% | 2306 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,458 psi | 47% | 2365 fps | 95.5% |
| Alliant Reloder-26 | 53 gr | 80% | 30,719 psi | 47% | 2411 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 38,479 psi | 59% | 2539 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 50,299 psi | 77% | 2648 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,654 psi | 63% | 2618 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 39,001 psi | 60% | 2552 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 43,830 psi | 67% | 2530 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 41,278 psi | 64% | 2579 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 50,415 psi | 78% | 2661 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,090 psi | 65% | 2569 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,005 psi | 69% | 2585 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 92% | 48,051 psi | 74% | 2667 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,065 psi | 72% | 2648 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,521 psi | 56% | 2425 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 55,027 psi | 85% | 2743 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,450 psi | 59% | 2612 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 41,046 psi | 63% | 2582 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 42% | 1516 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,445 psi | 79% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,534 psi | 82% | 2674 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 39,552 psi | 61% | 2464 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,165 psi | 69% | 2556 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 38,566 psi | 59% | 2474 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 54,215 psi | 83% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,891 psi | 72% | 2608 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 43,076 psi | 66% | 2635 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 51,750 psi | 80% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,946 psi | 66% | 2513 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 41,118 psi | 63% | 2497 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 31,053 psi | 48% | 2306 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 52,199 psi | 80% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,943 psi | 60% | 2490 fps | 95% |
| Norma MRP | 54 gr | 84% | 35,462 psi | 55% | 2500 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 39,900 psi | 61% | 2513 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 52,736 psi | 81% | 2710 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,743 psi | 66% | 2641 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 38,609 psi | 59% | 2503 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 92% | 38,043 psi | 59% | 2526 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 43% | 1549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,212 psi | 77% | 2648 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,007 psi | 72% | 2690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,074 psi | 62% | 2543 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,508 psi | 59% | 2549 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,172 psi | 54% | 2530 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 53,635 psi | 83% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,326 psi | 73% | 2598 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,975 psi | 66% | 2543 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 37,710 psi | 58% | 2484 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,830 psi | 67% | 2530 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,946 psi | 66% | 2513 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 51,750 psi | 80% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,118 psi | 63% | 2497 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,356 psi | 74% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,022 psi | 74% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,843 psi | 64% | 2457 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,885 psi | 61% | 2533 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 47,543 psi | 73% | 2595 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,731 psi | 72% | 2585 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 36,535 psi | 56% | 2477 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,911 psi | 55% | 2415 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 53,867 psi | 83% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,041 psi | 83% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,324 psi | 70% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,205 psi | 63% | 2513 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 37,826 psi | 58% | 2451 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 52,228 psi | 80% | 2615 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,683 psi | 63% | 2516 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 32,024 psi | 49% | 2375 fps | 98% |
| Vihtavuori N560 | 59.2 gr | 92% | 47,152 psi | 73% | 2726 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 96% | 43,337 psi | 67% | 2648 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,263 psi | 62% | 2484 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,293 psi | 65% | 2572 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,353 psi | 39% | 2287 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,205 psi | 62% | 2507 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 93 powders for .280 Ackley Improved loaded with the .284 | 165gr | Remington SP Core-Lokt. Norma MRP delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,917 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 165.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .280 Ackley Improved with the .284 | 165gr | Remington SP Core-Lokt 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.