Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 140gr | Barnes Solid bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2015 | <<locked>> | 82% | 57,130 psi | 88% | 2831 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,797 psi | 87% | 2861 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,247 psi | 90% | 2930 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,523 psi | 90% | 2923 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,529 psi | 73% | 2831 fps | 98% |
| Accurate 4064 | <<locked>> | 88% | 56,782 psi | 87% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,246 psi | 88% | 3012 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 56,376 psi | 87% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,479 psi | 88% | 2946 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2992 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,697 psi | 90% | 2940 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,579 psi | 87% | 2861 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,536 psi | 87% | 3071 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,015 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,494 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 58,015 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,622 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,940 psi | 83% | 2976 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,759 psi | 69% | 2861 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,378 psi | 61% | 2759 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,053 psi | 79% | 3048 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,347 psi | 87% | 2959 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,085 psi | 85% | 2930 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 58,421 psi | 90% | 2963 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,637 psi | 87% | 2871 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,940 psi | 85% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,825 psi | 86% | 2946 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 56,086 psi | 86% | 3009 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 56,115 psi | 86% | 2966 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 84% | 57,000 psi | 88% | 2953 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2989 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,101 psi | 88% | 2992 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,463 psi | 87% | 3048 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,940 psi | 55% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,088 psi | 89% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,377 psi | 88% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,869 psi | 87% | 2927 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,521 psi | 87% | 2910 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 55,463 psi | 85% | 2936 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,666 psi | 87% | 2936 fps | 98.6% |
| IMR 4831 | <<locked>> | 98% | 57,537 psi | 89% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,289 psi | 87% | 2969 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,697 psi | 90% | 2940 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,579 psi | 87% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,347 psi | 85% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,130 psi | 88% | 2923 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,333 psi | 87% | 2933 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 57,566 psi | 89% | 2972 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,523 psi | 61% | 2677 fps | 96% |
| Norma 201 | <<locked>> | 86% | 58,697 psi | 90% | 2940 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,767 psi | 86% | 2884 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,711 psi | 89% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,333 psi | 87% | 2989 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 50,328 psi | 77% | 2995 fps | 97.7% |
| Norma URP | <<locked>> | 96% | 55,956 psi | 86% | 2995 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 58,610 psi | 90% | 3005 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,465 psi | 90% | 3051 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 55,230 psi | 85% | 2910 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,114 psi | 85% | 2927 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,564 psi | 56% | 1854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,043 psi | 86% | 2930 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,535 psi | 85% | 3005 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,405 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,261 psi | 88% | 3038 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,840 psi | 86% | 3061 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 56,057 psi | 86% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,840 psi | 86% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,230 psi | 85% | 2930 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,855 psi | 87% | 2963 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,823 psi | 81% | 2959 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 58,421 psi | 90% | 2963 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,333 psi | 87% | 2933 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,579 psi | 87% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,130 psi | 88% | 2923 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,566 psi | 89% | 2972 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,840 psi | 87% | 2989 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,696 psi | 89% | 2946 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,552 psi | 90% | 2966 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,246 psi | 87% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,942 psi | 88% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,623 psi | 87% | 2887 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,330 psi | 81% | 2953 fps | 96.7% |
| Somchem S335 | <<locked>> | 84% | 55,709 psi | 86% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,421 psi | 88% | 2933 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,274 psi | 85% | 2923 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 58,537 psi | 90% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2936 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 56,652 psi | 87% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,767 psi | 86% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,217 psi | 86% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,855 psi | 87% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 58,349 psi | 90% | 2989 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 55,492 psi | 85% | 2887 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,030 psi | 89% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,551 psi | 89% | 2999 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,850 psi | 77% | 2936 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,610 psi | 90% | 2966 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,057 psi | 86% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,376 psi | 87% | 3012 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,190 psi | 62% | 2887 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,740 psi | 90% | 2976 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,517 psi | 78% | 2874 fps | 96% |
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 2015 | <<locked>> | 80% | 53,853 psi | 83% | 2785 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,717 psi | 72% | 2717 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,244 psi | 83% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,179 psi | 70% | 2697 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 38,595 psi | 59% | 2657 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 44,193 psi | 68% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,953 psi | 51% | 2546 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,647 psi | 76% | 2835 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,192 psi | 65% | 2680 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 48,196 psi | 74% | 2867 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,721 psi | 80% | 2835 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,142 psi | 82% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,774 psi | 70% | 2884 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,221 psi | 65% | 2703 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,266 psi | 70% | 2772 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,895 psi | 51% | 2559 fps | 95.7% |
| Alliant Reloder-17 | 49.8 gr | 80% | 36,709 psi | 56% | 2684 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,398 psi | 73% | 2861 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,877 psi | 44% | 2467 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,956 psi | 57% | 2697 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,578 psi | 55% | 2713 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,153 psi | 76% | 2841 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,250 psi | 65% | 2713 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,844 psi | 66% | 2687 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,229 psi | 82% | 2818 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,285 psi | 79% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,033 psi | 66% | 2723 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 40,205 psi | 62% | 2713 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 46,340 psi | 71% | 2792 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 50,198 psi | 77% | 2844 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,356 psi | 47% | 2457 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,485 psi | 72% | 2822 fps | 100% |
| Hodgdon Superformance | 56.6 gr | 86% | 42,279 psi | 65% | 2785 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 41% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,153 psi | 74% | 2795 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,401 psi | 78% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,324 psi | 68% | 2717 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,804 psi | 72% | 2743 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 43,236 psi | 67% | 2717 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,611 psi | 64% | 2664 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,966 psi | 49% | 2503 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 46,427 psi | 71% | 2802 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,721 psi | 80% | 2835 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,647 psi | 76% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,023 psi | 75% | 2762 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,440 psi | 68% | 2720 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,666 psi | 56% | 2559 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,682 psi | 61% | 2644 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,883 psi | 57% | 2621 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,689 psi | 75% | 2785 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,008 psi | 75% | 2782 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,643 psi | 69% | 2759 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,052 psi | 75% | 2867 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 41,017 psi | 63% | 2805 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 33,127 psi | 51% | 2546 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 44,556 psi | 69% | 2776 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 39,407 psi | 61% | 2703 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 51,663 psi | 79% | 2851 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,735 psi | 80% | 2874 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,224 psi | 42% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,033 psi | 66% | 2700 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,501 psi | 75% | 2890 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,059 psi | 60% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,692 psi | 50% | 2559 fps | 95% |
| ReloadSwiss RS 70 | 51.9 gr | 82% | 34,664 psi | 53% | 2621 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 52,634 psi | 81% | 2815 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,296 psi | 71% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,827 psi | 61% | 2657 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 53,272 psi | 82% | 2904 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 96% | 46,354 psi | 71% | 2841 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 42,844 psi | 66% | 2687 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,666 psi | 56% | 2559 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,647 psi | 76% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,440 psi | 68% | 2720 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,682 psi | 61% | 2644 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,915 psi | 63% | 2710 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,473 psi | 78% | 2831 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,269 psi | 74% | 2805 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,574 psi | 76% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,640 psi | 64% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,886 psi | 63% | 2608 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,905 psi | 71% | 2835 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,414 psi | 76% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,995 psi | 77% | 2822 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,451 psi | 62% | 2661 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,820 psi | 46% | 2500 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 43,990 psi | 68% | 2766 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,038 psi | 77% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,137 psi | 71% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,572 psi | 72% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,522 psi | 59% | 2592 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,461 psi | 53% | 2549 fps | 96% |
| Vihtavuori N530 | <<locked>> | 80% | 51,967 psi | 80% | 2831 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,063 psi | 69% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,113 psi | 52% | 2549 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 31,415 psi | 48% | 2546 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,953 psi | 52% | 2520 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 52,228 psi | 80% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,422 psi | 62% | 2717 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,993 psi | 45% | 2552 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,950 psi | 74% | 2812 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,891 psi | 72% | 2808 fps | 95% |
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 118 powders for .280 Ackley Improved loaded with the .284 | 140gr | Barnes Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,071 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Barnes Solid they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.