Load Specifications
Bullet:.284 | 140gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:140 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.280 Ackley Improved load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:13.0
Load data in caliber .280 Ackley Improved with .284 | 140gr | Swift A-Frame 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.
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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% | 56,130 psi | 86% | 2864 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,856 psi | 89% | 2933 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,111 psi | 79% | 2907 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 56,333 psi | 87% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,101 psi | 88% | 3022 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,550 psi | 85% | 2946 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,884 psi | 88% | 2953 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3064 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,740 psi | 89% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,956 psi | 86% | 3077 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,522 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,711 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,682 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,521 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,377 psi | 88% | 3051 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,908 psi | 78% | 2986 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,848 psi | 74% | 2927 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,003 psi | 65% | 2838 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,056 psi | 85% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,463 psi | 85% | 2963 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 58,537 psi | 90% | 2992 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,908 psi | 78% | 2986 fps | 96.8% |
| Bofors RP7 | <<locked>> | 92% | 57,740 psi | 89% | 2972 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 82% | 58,001 psi | 89% | 2976 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,259 psi | 85% | 2953 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 55,767 psi | 86% | 3018 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 55,564 psi | 85% | 2976 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 56,144 psi | 86% | 2956 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,972 psi | 89% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,391 psi | 87% | 2992 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,883 psi | 86% | 3054 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,305 psi | 88% | 2959 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,884 psi | 88% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,101 psi | 86% | 2933 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,550 psi | 85% | 2913 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 58,740 psi | 90% | 3005 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,796 psi | 86% | 2943 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 57,522 psi | 88% | 3012 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,753 psi | 86% | 2976 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,841 psi | 89% | 2989 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 82% | 57,740 psi | 89% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,014 psi | 86% | 2923 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,812 psi | 89% | 2920 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,478 psi | 87% | 2930 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,825 psi | 86% | 2943 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 57,188 psi | 88% | 2986 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,453 psi | 65% | 2749 fps | 97.2% |
| Norma 201 | <<locked>> | 84% | 57,769 psi | 89% | 2940 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,508 psi | 90% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,956 psi | 88% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,941 psi | 86% | 3002 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 53,954 psi | 83% | 3074 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 55,825 psi | 86% | 3009 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,827 psi | 89% | 3009 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 58,189 psi | 90% | 3061 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 57,870 psi | 89% | 2969 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,986 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 57% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,245 psi | 85% | 2936 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,085 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,085 psi | 85% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,130 psi | 88% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,709 psi | 86% | 3074 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,407 psi | 90% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,494 psi | 90% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,378 psi | 90% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,376 psi | 87% | 2976 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,478 psi | 87% | 3031 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 92% | 57,740 psi | 89% | 2972 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,825 psi | 86% | 2943 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,014 psi | 86% | 2923 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,478 psi | 87% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,188 psi | 88% | 2986 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,463 psi | 87% | 2995 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,000 psi | 88% | 2953 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,653 psi | 89% | 2972 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,682 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,101 psi | 86% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,738 psi | 86% | 2894 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,970 psi | 86% | 3028 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 58,291 psi | 90% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,420 psi | 87% | 2936 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,276 psi | 90% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,247 psi | 90% | 2966 fps | 96% |
| Somchem S365 | <<locked>> | 98% | 58,595 psi | 90% | 3061 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,348 psi | 88% | 3012 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 55,651 psi | 86% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,769 psi | 90% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,564 psi | 85% | 2867 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,101 psi | 86% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,972 psi | 89% | 3002 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,458 psi | 76% | 2867 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 82% | 58,421 psi | 90% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,305 psi | 88% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,116 psi | 88% | 3009 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,795 psi | 83% | 3009 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,885 psi | 89% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,767 psi | 86% | 3018 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,178 psi | 66% | 2969 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,769 psi | 89% | 2979 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,737 psi | 83% | 2943 fps | 97.1% |
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% | 49,443 psi | 76% | 2769 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,311 psi | 73% | 2759 fps | 96.6% |
| Accurate 3100 | <<locked>> | 90% | 36,245 psi | 56% | 2615 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,818 psi | 72% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,360 psi | 54% | 2612 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 80% | 52,272 psi | 80% | 2894 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,353 psi | 68% | 2740 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 47,834 psi | 74% | 2884 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,389 psi | 84% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,486 psi | 75% | 2949 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,556 psi | 69% | 2762 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,834 psi | 74% | 2835 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,621 psi | 53% | 2621 fps | 96.8% |
| Alliant Reloder-17 | 52.6 gr | 80% | 39,102 psi | 60% | 2753 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,210 psi | 73% | 2874 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,411 psi | 68% | 2861 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,761 psi | 44% | 2477 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,679 psi | 53% | 2654 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,170 psi | 51% | 2657 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,996 psi | 80% | 2907 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,817 psi | 69% | 2772 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 44,411 psi | 68% | 2861 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 42,337 psi | 65% | 2694 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,070 psi | 83% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,179 psi | 70% | 2779 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 39,827 psi | 61% | 2717 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 45,832 psi | 71% | 2802 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 52,881 psi | 81% | 2907 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,155 psi | 49% | 2516 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,327 psi | 76% | 2881 fps | 100% |
| Hodgdon Superformance | 58.4 gr | 84% | 41,945 psi | 65% | 2792 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,444 psi | 78% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,374 psi | 82% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,644 psi | 72% | 2772 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,776 psi | 75% | 2799 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 42,801 psi | 66% | 2723 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,176 psi | 63% | 2671 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 33,997 psi | 52% | 2566 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 49,081 psi | 76% | 2864 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,201 psi | 83% | 2930 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 54,389 psi | 84% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,373 psi | 81% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,300 psi | 79% | 2818 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,804 psi | 72% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,667 psi | 59% | 2621 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 39,160 psi | 60% | 2648 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 37,246 psi | 57% | 2638 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,140 psi | 79% | 2838 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,517 psi | 79% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,210 psi | 73% | 2822 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 45,614 psi | 70% | 2818 fps | 95% |
| Norma MRP | <<locked>> | 92% | 40,973 psi | 63% | 2818 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,230 psi | 54% | 2608 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,166 psi | 73% | 2838 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,608 psi | 56% | 2651 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 54,317 psi | 84% | 2913 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,375 psi | 84% | 2930 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 42% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,440 psi | 70% | 2762 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,416 psi | 79% | 2953 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,553 psi | 64% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,056 psi | 54% | 2628 fps | 96.3% |
| ReloadSwiss RS 70 | 53.4 gr | 80% | 34,229 psi | 53% | 2625 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 55,042 psi | 85% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,733 psi | 75% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,163 psi | 65% | 2717 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 52,736 psi | 81% | 2917 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 94% | 46,325 psi | 71% | 2858 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 42,337 psi | 65% | 2694 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,667 psi | 59% | 2621 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,373 psi | 81% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,804 psi | 72% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,160 psi | 60% | 2648 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,294 psi | 67% | 2769 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,084 psi | 82% | 2894 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,647 psi | 78% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,822 psi | 80% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,700 psi | 67% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,321 psi | 62% | 2615 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,890 psi | 71% | 2851 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 51,764 psi | 80% | 2776 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,910 psi | 81% | 2884 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,714 psi | 66% | 2720 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,592 psi | 84% | 2910 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 31,792 psi | 49% | 2566 fps | 98.7% |
| Somchem S385 | <<locked>> | 90% | 41,162 psi | 63% | 2720 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 52,344 psi | 81% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,602 psi | 75% | 2756 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,921 psi | 75% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,669 psi | 63% | 2648 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,724 psi | 56% | 2615 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 96% | 43,308 psi | 67% | 2753 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 54,650 psi | 84% | 2890 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,181 psi | 73% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,071 psi | 55% | 2608 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 29,501 psi | 45% | 2500 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,998 psi | 55% | 2585 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 40,030 psi | 62% | 2723 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,180 psi | 42% | 2503 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,647 psi | 78% | 2871 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,847 psi | 72% | 2825 fps | 95.5% |
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 102 powders for .280 Ackley Improved loaded with the .284 | 140gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,123 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 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 140.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 | Swift A-Frame 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.