Load Specifications
Load data in caliber .280 Ackley Improved with .283 | 150gr | Rhino Penetrator 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-16 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% | 55,651 psi | 86% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,319 psi | 88% | 2815 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,343 psi | 77% | 2792 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 56,057 psi | 86% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,536 psi | 87% | 2907 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 58,726 psi | 90% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,217 psi | 86% | 2831 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,595 psi | 89% | 2946 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,305 psi | 88% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,317 psi | 85% | 2953 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,884 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,319 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,174 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,708 psi | 84% | 2933 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 2930 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,270 psi | 77% | 2874 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,224 psi | 73% | 2812 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,365 psi | 64% | 2730 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,983 psi | 83% | 3002 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,056 psi | 85% | 2848 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 57,827 psi | 89% | 2874 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,270 psi | 77% | 2874 fps | 97.1% |
| Bofors RP7 | <<locked>> | 92% | 57,261 psi | 88% | 2854 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,668 psi | 90% | 2802 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,464 psi | 88% | 2858 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,436 psi | 90% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 58,726 psi | 90% | 2956 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 92% | 58,740 psi | 90% | 2917 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 82% | 55,695 psi | 86% | 2835 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,551 psi | 89% | 2884 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,840 psi | 86% | 2874 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,259 psi | 85% | 2936 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 56% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,739 psi | 87% | 2838 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,405 psi | 87% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,840 psi | 86% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,769 psi | 90% | 2854 fps | 99.3% |
| IMR 4350 | <<locked>> | 96% | 57,856 psi | 89% | 2884 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,521 psi | 85% | 2831 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 56,855 psi | 87% | 2894 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,172 psi | 85% | 2854 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,029 psi | 88% | 2871 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 82% | 57,305 psi | 88% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,492 psi | 85% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,363 psi | 88% | 2802 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,898 psi | 86% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,288 psi | 85% | 2825 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 56,623 psi | 87% | 2867 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,814 psi | 64% | 2644 fps | 97.4% |
| Norma 201 | <<locked>> | 84% | 57,290 psi | 88% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,088 psi | 89% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,608 psi | 87% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,216 psi | 85% | 2884 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 53,229 psi | 82% | 2959 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 58,653 psi | 90% | 2940 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,450 psi | 88% | 2894 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,537 psi | 89% | 2943 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 57,493 psi | 88% | 2854 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,508 psi | 88% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 57% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,233 psi | 90% | 2874 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,320 psi | 90% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,218 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,115 psi | 86% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,682 psi | 90% | 3012 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 58,189 psi | 90% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,841 psi | 89% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,638 psi | 89% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,651 psi | 86% | 2858 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2917 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 57,261 psi | 88% | 2854 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,288 psi | 85% | 2825 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,492 psi | 85% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,898 psi | 86% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,623 psi | 87% | 2867 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,695 psi | 86% | 2874 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,260 psi | 87% | 2831 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,101 psi | 88% | 2851 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,291 psi | 90% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,521 psi | 85% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,172 psi | 85% | 2779 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,419 psi | 85% | 2913 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 57,827 psi | 89% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,014 psi | 86% | 2818 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,827 psi | 89% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 57,638 psi | 89% | 2854 fps | 96.2% |
| Somchem S365 | <<locked>> | 98% | 57,725 psi | 89% | 2940 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,652 psi | 87% | 2894 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 84% | 58,740 psi | 90% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,204 psi | 90% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,610 psi | 90% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,419 psi | 85% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,522 psi | 88% | 2884 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,704 psi | 75% | 2756 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 82% | 57,769 psi | 89% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,869 psi | 87% | 2795 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,507 psi | 87% | 2890 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,055 psi | 82% | 2894 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,246 psi | 88% | 2854 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,668 psi | 90% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,317 psi | 85% | 2904 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,511 psi | 65% | 2858 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,363 psi | 88% | 2861 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,171 psi | 82% | 2831 fps | 97.3% |
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% | 48,907 psi | 75% | 2654 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,065 psi | 72% | 2651 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 35,766 psi | 55% | 2516 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 46,325 psi | 71% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,838 psi | 54% | 2510 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 51,677 psi | 80% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,874 psi | 67% | 2628 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 44,396 psi | 68% | 2713 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,095 psi | 74% | 2835 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,382 psi | 68% | 2657 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,253 psi | 73% | 2720 fps | 99.8% |
| Alliant Reloder-16 | 45.9 gr | 80% | 34,403 psi | 53% | 2523 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,638 psi | 59% | 2644 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,845 psi | 67% | 2707 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,976 psi | 68% | 2756 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,818 psi | 41% | 2333 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,330 psi | 53% | 2552 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,735 psi | 50% | 2559 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,416 psi | 79% | 2789 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 44,324 psi | 68% | 2661 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 43,976 psi | 68% | 2756 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 39,436 psi | 61% | 2533 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,100 psi | 85% | 2753 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,592 psi | 82% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,020 psi | 69% | 2674 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 39,566 psi | 61% | 2615 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 82% | 42,598 psi | 66% | 2635 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,272 psi | 80% | 2785 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,894 psi | 49% | 2421 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,762 psi | 75% | 2766 fps | 100% |
| Hodgdon Superformance | 54.9 gr | 84% | 41,510 psi | 64% | 2687 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 42% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,125 psi | 77% | 2740 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,707 psi | 81% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,137 psi | 71% | 2661 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,602 psi | 75% | 2690 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 39,813 psi | 61% | 2566 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,843 psi | 63% | 2566 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 33,678 psi | 52% | 2467 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 48,472 psi | 75% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,534 psi | 82% | 2815 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,953 psi | 80% | 2753 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,821 psi | 78% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,296 psi | 71% | 2661 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,305 psi | 59% | 2516 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 38,957 psi | 60% | 2549 fps | 95.8% |
| Lovex S071 | <<locked>> | 94% | 34,563 psi | 53% | 2487 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 50,633 psi | 78% | 2723 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,343 psi | 79% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,630 psi | 72% | 2707 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,962 psi | 69% | 2707 fps | 95.3% |
| Norma MRP | <<locked>> | 92% | 40,480 psi | 62% | 2713 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,882 psi | 54% | 2510 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 46,789 psi | 72% | 2730 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,245 psi | 56% | 2549 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 53,780 psi | 83% | 2799 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,998 psi | 83% | 2815 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 42% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,947 psi | 69% | 2654 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,966 psi | 78% | 2835 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,089 psi | 63% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,621 psi | 53% | 2526 fps | 96.7% |
| ReloadSwiss RS 70 | 50.2 gr | 80% | 33,939 psi | 52% | 2526 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 54,868 psi | 84% | 2749 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,182 psi | 74% | 2674 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,785 psi | 64% | 2608 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,066 psi | 75% | 2749 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 92% | 42,815 psi | 66% | 2687 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 39,436 psi | 61% | 2533 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,305 psi | 59% | 2516 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,953 psi | 80% | 2753 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,296 psi | 71% | 2661 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,957 psi | 60% | 2549 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,946 psi | 66% | 2664 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,765 psi | 81% | 2779 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,328 psi | 77% | 2749 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,648 psi | 79% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,526 psi | 67% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,420 psi | 58% | 2457 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,397 psi | 70% | 2743 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 51,300 psi | 79% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,286 psi | 80% | 2766 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,250 psi | 65% | 2608 fps | 99.7% |
| Somchem S361 | <<locked>> | 96% | 53,809 psi | 83% | 2795 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 31,459 psi | 48% | 2467 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 40,756 psi | 63% | 2618 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 52,170 psi | 80% | 2648 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,414 psi | 74% | 2644 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,573 psi | 75% | 2657 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,292 psi | 62% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,216 psi | 56% | 2510 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 42,801 psi | 66% | 2648 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 54,085 psi | 83% | 2769 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,007 psi | 72% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,868 psi | 55% | 2513 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 29,225 psi | 45% | 2408 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,549 psi | 55% | 2480 fps | 99% |
| Winchester 748 | <<locked>> | 80% | 54,636 psi | 84% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 39,566 psi | 61% | 2615 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,818 psi | 41% | 2411 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,154 psi | 77% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,006 psi | 71% | 2713 fps | 95.7% |
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 119 powders for .280 Ackley Improved loaded with the .283 | 150gr | Rhino Penetrator. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,012 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 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 150.0 gr projectile in 0.283" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .283 | 150gr | Rhino Penetrator they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Bofors RP30 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.