Load Specifications
Bullet Manufacturer:Woodleigh
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 | Woodleigh PP SN 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, 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 2495 | <<locked>> | 84% | 56,391 psi | 87% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,390 psi | 85% | 2884 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2907 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 56,565 psi | 87% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,319 psi | 88% | 3028 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,492 psi | 85% | 2946 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,797 psi | 87% | 2953 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,334 psi | 90% | 3064 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,682 psi | 89% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,869 psi | 86% | 3074 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,479 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,914 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,943 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,419 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 3048 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,807 psi | 78% | 2986 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,066 psi | 74% | 2930 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,945 psi | 65% | 2835 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,969 psi | 85% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,637 psi | 86% | 2966 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 58,465 psi | 90% | 2992 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,807 psi | 78% | 2986 fps | 96.8% |
| Bofors RP7 | <<locked>> | 92% | 57,928 psi | 89% | 2976 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,899 psi | 89% | 2976 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,187 psi | 85% | 2953 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 57,159 psi | 88% | 3041 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 57,464 psi | 88% | 3005 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 82% | 56,086 psi | 86% | 2956 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 58,247 psi | 90% | 3002 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,594 psi | 87% | 2995 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,086 psi | 86% | 3058 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,129 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,376 psi | 87% | 2946 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,622 psi | 86% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,463 psi | 85% | 2923 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,015 psi | 89% | 2956 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 58,653 psi | 90% | 3005 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,043 psi | 86% | 2949 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 58,320 psi | 90% | 3025 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,680 psi | 86% | 2976 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,740 psi | 89% | 2989 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 82% | 57,682 psi | 89% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,956 psi | 86% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 58,015 psi | 89% | 2923 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,391 psi | 87% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,014 psi | 86% | 2946 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 57,116 psi | 88% | 2986 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,380 psi | 65% | 2749 fps | 97.2% |
| Norma 201 | <<locked>> | 84% | 57,986 psi | 89% | 2943 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,436 psi | 90% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,159 psi | 88% | 2986 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,869 psi | 86% | 3002 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 54,128 psi | 83% | 3077 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 55,724 psi | 86% | 3005 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 58,088 psi | 89% | 3012 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,580 psi | 89% | 3104 fps | 97% |
| Ramshot Hunter | <<locked>> | 96% | 58,363 psi | 90% | 3064 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,893 psi | 77% | 2943 fps | 97.2% |
| Ramshot TAC | <<locked>> | 82% | 58,088 psi | 89% | 2972 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 58,233 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,158 psi | 85% | 2936 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,042 psi | 85% | 3012 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,998 psi | 85% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,058 psi | 88% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,637 psi | 86% | 3074 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,639 psi | 90% | 2917 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,407 psi | 90% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,581 psi | 90% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,318 psi | 87% | 2976 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,739 psi | 87% | 3038 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 92% | 57,928 psi | 89% | 2976 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,014 psi | 86% | 2946 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,956 psi | 86% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,391 psi | 87% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,116 psi | 88% | 2986 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,376 psi | 87% | 2995 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,913 psi | 88% | 2953 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,566 psi | 89% | 2969 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,624 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,028 psi | 86% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,695 psi | 86% | 2894 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,231 psi | 87% | 3031 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 58,494 psi | 90% | 2867 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,666 psi | 87% | 2940 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,218 psi | 90% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,450 psi | 90% | 2969 fps | 96% |
| Somchem S365 | <<locked>> | 98% | 58,552 psi | 90% | 3061 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,276 psi | 88% | 3012 fps | 98.6% |
| Unknown powder | <<locked>> | 92% | 56,463 psi | 87% | 3015 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 82% | 55,608 psi | 86% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,682 psi | 90% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,521 psi | 85% | 2864 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,333 psi | 87% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 58,233 psi | 90% | 3005 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,356 psi | 76% | 2864 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 82% | 58,334 psi | 90% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,246 psi | 88% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,305 psi | 88% | 3009 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,693 psi | 83% | 3009 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 58,131 psi | 89% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,159 psi | 88% | 3041 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,352 psi | 67% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,724 psi | 86% | 2976 fps | 97.5% |
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% | 49,400 psi | 76% | 2769 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,699 psi | 66% | 2657 fps | 95.4% |
| Accurate 3100 | <<locked>> | 90% | 36,405 psi | 56% | 2621 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 46,789 psi | 72% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,346 psi | 54% | 2612 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 80% | 52,228 psi | 80% | 2894 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,309 psi | 68% | 2740 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 48,051 psi | 74% | 2887 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,331 psi | 84% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,718 psi | 75% | 2953 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,730 psi | 69% | 2766 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,790 psi | 74% | 2835 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,766 psi | 53% | 2625 fps | 96.9% |
| Alliant Reloder-17 | 52.6 gr | 80% | 39,044 psi | 60% | 2753 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,369 psi | 73% | 2874 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,585 psi | 69% | 2864 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,848 psi | 44% | 2480 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,809 psi | 54% | 2657 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,127 psi | 51% | 2657 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,953 psi | 80% | 2907 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,773 psi | 69% | 2772 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 44,585 psi | 69% | 2864 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 42,293 psi | 65% | 2694 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,259 psi | 83% | 2923 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,368 psi | 70% | 2782 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,611 psi | 62% | 2733 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 44,875 psi | 69% | 2782 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,808 psi | 81% | 2904 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,300 psi | 50% | 2520 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,528 psi | 72% | 2831 fps | 100% |
| Hodgdon Superformance | 58.4 gr | 84% | 41,901 psi | 64% | 2792 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 42% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,891 psi | 72% | 2789 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,878 psi | 75% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,540 psi | 67% | 2717 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,946 psi | 66% | 2684 fps | 96.3% |
| IMR 4350 | <<locked>> | 86% | 42,960 psi | 66% | 2726 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,133 psi | 63% | 2671 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 30,995 psi | 48% | 2487 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 49,008 psi | 75% | 2864 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,099 psi | 83% | 2930 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 54,331 psi | 84% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,315 psi | 80% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,227 psi | 79% | 2818 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,760 psi | 72% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,653 psi | 59% | 2618 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 39,320 psi | 60% | 2651 fps | 95.4% |
| Lovex S071 | <<locked>> | 96% | 37,391 psi | 58% | 2641 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 51,068 psi | 79% | 2838 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,721 psi | 80% | 2838 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,152 psi | 73% | 2822 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,762 psi | 75% | 2877 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 40,886 psi | 63% | 2818 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,215 psi | 54% | 2608 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,340 psi | 73% | 2841 fps | 99.8% |
| Ramshot Grand | <<locked>> | 96% | 49,487 psi | 76% | 2959 fps | 95% |
| Ramshot Hunter | <<locked>> | 82% | 36,550 psi | 56% | 2651 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 96% | 42,917 psi | 66% | 2808 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 54,273 psi | 83% | 2913 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,331 psi | 84% | 2930 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 42% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,397 psi | 70% | 2762 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,329 psi | 79% | 2949 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,510 psi | 64% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,027 psi | 54% | 2628 fps | 96.3% |
| ReloadSwiss RS 70 | 53.5 gr | 80% | 34,374 psi | 53% | 2631 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 55,216 psi | 85% | 2871 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,689 psi | 75% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,119 psi | 65% | 2717 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 52,939 psi | 81% | 2920 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 94% | 46,267 psi | 71% | 2854 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 42,293 psi | 65% | 2694 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,653 psi | 59% | 2618 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,315 psi | 80% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,760 psi | 72% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,320 psi | 60% | 2651 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,250 psi | 67% | 2769 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,026 psi | 82% | 2890 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,604 psi | 78% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,040 psi | 80% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,874 psi | 67% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,466 psi | 62% | 2618 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,847 psi | 71% | 2848 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 51,706 psi | 80% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,823 psi | 81% | 2881 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,656 psi | 66% | 2720 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,752 psi | 84% | 2913 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 31,734 psi | 49% | 2562 fps | 98.7% |
| Somchem S385 | <<locked>> | 90% | 41,321 psi | 64% | 2723 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 38,101 psi | 59% | 2671 fps | 96.9% |
| Vihtavuori N133 | <<locked>> | 80% | 52,547 psi | 81% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,805 psi | 75% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,878 psi | 75% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,596 psi | 62% | 2648 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,666 psi | 56% | 2612 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 43,221 psi | 66% | 2753 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 54,563 psi | 84% | 2887 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,355 psi | 73% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,187 psi | 56% | 2612 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 82% | 29,486 psi | 45% | 2500 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,940 psi | 55% | 2582 fps | 98.9% |
| Winchester 760 | <<locked>> | 80% | 40,611 psi | 62% | 2733 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,166 psi | 42% | 2503 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,034 psi | 69% | 2792 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 104 powders for .280 Ackley Improved loaded with the .284 | 140gr | Woodleigh PP SN. 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 104 of the 104 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 | Woodleigh PP SN 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.