Load Specifications
Bullet Manufacturer:Ferrobull Europe
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:1:11.5
Load data in caliber .280 Ackley Improved with .284 | 140gr | Ferrobull Tripple Expand Jagd bullet and 107 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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% | 57,435 psi | 88% | 2848 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,768 psi | 87% | 2877 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,494 psi | 90% | 2946 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,390 psi | 85% | 2890 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,037 psi | 74% | 2854 fps | 98.3% |
| Accurate 4064 | <<locked>> | 88% | 57,101 psi | 88% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,160 psi | 89% | 3038 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,855 psi | 87% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,218 psi | 90% | 2969 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,840 psi | 86% | 3022 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,680 psi | 86% | 2910 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,101 psi | 88% | 2877 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,566 psi | 89% | 3100 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,564 psi | 85% | 3012 fps | 97.4% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,564 psi | 85% | 3012 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,639 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,245 psi | 85% | 2959 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,158 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,768 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 3002 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,240 psi | 74% | 2936 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,397 psi | 70% | 2884 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,697 psi | 61% | 2782 fps | 96.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,837 psi | 80% | 3074 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,956 psi | 88% | 2982 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,535 psi | 85% | 2953 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,240 psi | 74% | 2936 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 55,521 psi | 85% | 2933 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,942 psi | 88% | 2890 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,521 psi | 85% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,289 psi | 87% | 2969 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 56,782 psi | 87% | 3031 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 56,884 psi | 88% | 2992 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 84% | 57,464 psi | 88% | 2972 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,274 psi | 85% | 2959 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,798 psi | 89% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,479 psi | 88% | 3077 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,013 psi | 55% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,027 psi | 85% | 2923 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,131 psi | 89% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,609 psi | 89% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,898 psi | 88% | 2933 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,115 psi | 86% | 2963 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,203 psi | 88% | 2963 fps | 98.8% |
| IMR 4831 | <<locked>> | 98% | 58,465 psi | 90% | 3025 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,710 psi | 87% | 2989 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,680 psi | 86% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,159 psi | 88% | 2936 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,927 psi | 86% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,464 psi | 88% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,985 psi | 88% | 2956 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 58,131 psi | 89% | 2995 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,711 psi | 61% | 2697 fps | 96.3% |
| Norma 201 | <<locked>> | 84% | 55,405 psi | 85% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,289 psi | 87% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,334 psi | 90% | 3002 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,246 psi | 88% | 3018 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 51,198 psi | 79% | 3025 fps | 98.1% |
| Norma URP | <<locked>> | 96% | 56,710 psi | 87% | 3018 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,535 psi | 85% | 2976 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,695 psi | 86% | 3022 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 55,782 psi | 86% | 2933 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,738 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,550 psi | 56% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,434 psi | 87% | 2953 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,347 psi | 87% | 3031 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,289 psi | 87% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,073 psi | 89% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,956 psi | 88% | 3094 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,115 psi | 86% | 2881 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,898 psi | 86% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,695 psi | 86% | 2949 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,406 psi | 88% | 2989 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,679 psi | 83% | 2986 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 55,521 psi | 85% | 2933 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,985 psi | 88% | 2956 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,159 psi | 88% | 2936 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,464 psi | 88% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,131 psi | 89% | 2995 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,711 psi | 89% | 3012 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,146 psi | 89% | 2969 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,405 psi | 85% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,594 psi | 87% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,435 psi | 88% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,145 psi | 88% | 2910 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2979 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 56,115 psi | 86% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,957 psi | 89% | 2956 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,782 psi | 86% | 2943 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,724 psi | 86% | 3022 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 2966 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 84% | 57,043 psi | 88% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,362 psi | 87% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,971 psi | 88% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,334 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,390 psi | 85% | 2963 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,833 psi | 72% | 2818 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 56,028 psi | 86% | 2910 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,552 psi | 90% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,088 psi | 89% | 3022 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,604 psi | 78% | 2963 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,376 psi | 85% | 2933 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,565 psi | 87% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,029 psi | 88% | 3038 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,683 psi | 63% | 2913 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,434 psi | 85% | 2943 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,111 psi | 79% | 2897 fps | 96.4% |
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% | 53,867 psi | 83% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,485 psi | 72% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,592 psi | 84% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,411 psi | 70% | 2720 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 36,216 psi | 56% | 2618 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,034 psi | 68% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,808 psi | 50% | 2552 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 49,864 psi | 77% | 2851 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,438 psi | 65% | 2700 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 48,718 psi | 75% | 2897 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,040 psi | 80% | 2858 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,388 psi | 82% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,209 psi | 71% | 2904 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,527 psi | 70% | 2835 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,527 psi | 70% | 2835 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,395 psi | 65% | 2723 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,426 psi | 70% | 2789 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,938 psi | 51% | 2575 fps | 95.9% |
| Alliant Reloder-17 | 51.4 gr | 80% | 36,927 psi | 57% | 2703 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,167 psi | 74% | 2887 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,947 psi | 69% | 2871 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,761 psi | 44% | 2480 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,246 psi | 57% | 2723 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,243 psi | 51% | 2661 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,792 psi | 77% | 2867 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,424 psi | 65% | 2730 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,947 psi | 69% | 2871 fps | 95% |
| Bofors RP7 | <<locked>> | 84% | 42,801 psi | 66% | 2703 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,577 psi | 82% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,590 psi | 79% | 2881 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,033 psi | 66% | 2736 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 40,393 psi | 62% | 2730 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 86% | 46,847 psi | 72% | 2818 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 50,430 psi | 78% | 2864 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,211 psi | 46% | 2467 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,949 psi | 72% | 2841 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,873 psi | 66% | 2812 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 41% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,486 psi | 75% | 2815 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,908 psi | 78% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,599 psi | 69% | 2736 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,978 psi | 72% | 2762 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 43,656 psi | 67% | 2740 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,930 psi | 65% | 2687 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 31,865 psi | 49% | 2513 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 46,601 psi | 72% | 2822 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,040 psi | 80% | 2858 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,661 psi | 76% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,371 psi | 76% | 2785 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,570 psi | 69% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,637 psi | 56% | 2572 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 39,581 psi | 61% | 2657 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 37,028 psi | 57% | 2638 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 48,791 psi | 75% | 2802 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,298 psi | 76% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,802 psi | 69% | 2779 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 46,485 psi | 72% | 2835 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 41,249 psi | 63% | 2825 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 33,170 psi | 51% | 2559 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,889 psi | 69% | 2799 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 37,057 psi | 57% | 2664 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 52,228 psi | 80% | 2877 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,083 psi | 80% | 2894 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,279 psi | 67% | 2720 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,776 psi | 75% | 2907 fps | 99.7% |
| ReloadSwiss RS 60 | 51.4 gr | 80% | 39,363 psi | 61% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,750 psi | 50% | 2572 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 34,838 psi | 54% | 2641 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 52,707 psi | 81% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,412 psi | 71% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,813 psi | 61% | 2671 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 96% | 50,459 psi | 78% | 2874 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 46,905 psi | 72% | 2867 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 42,801 psi | 66% | 2703 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,637 psi | 56% | 2572 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,661 psi | 76% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,570 psi | 69% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,581 psi | 61% | 2657 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,988 psi | 63% | 2723 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,676 psi | 78% | 2851 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,399 psi | 74% | 2822 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,966 psi | 77% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,916 psi | 64% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,901 psi | 63% | 2628 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,470 psi | 71% | 2861 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 49,588 psi | 76% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,647 psi | 78% | 2844 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,509 psi | 62% | 2677 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,733 psi | 46% | 2510 fps | 97.9% |
| Somchem S385 | <<locked>> | 92% | 41,553 psi | 64% | 2730 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 50,502 psi | 78% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,470 psi | 71% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,818 psi | 72% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,551 psi | 59% | 2608 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,519 psi | 53% | 2562 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 98% | 43,845 psi | 67% | 2762 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,504 psi | 81% | 2858 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,165 psi | 69% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,040 psi | 52% | 2562 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 31,415 psi | 48% | 2556 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,142 psi | 53% | 2539 fps | 98.3% |
| Winchester 748 | <<locked>> | 80% | 52,779 psi | 81% | 2904 fps | 100% |
| Winchester 760 | 52.9 gr | 84% | 40,611 psi | 62% | 2736 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,035 psi | 42% | 2497 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,341 psi | 74% | 2831 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,732 psi | 73% | 2838 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 107 powders for .280 Ackley Improved loaded with the .284 | 140gr | Ferrobull Tripple Expand Jagd. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,100 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Ferrobull Tripple Expand Jagd 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.