Load Specifications
Bullet Manufacturer:Nosler
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:1:12.5
Load data in caliber .280 Ackley Improved with .284 | 140gr | Nosler CT FailSafe bullet and 106 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% | 55,869 psi | 86% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,653 psi | 89% | 2930 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,937 psi | 78% | 2904 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 56,405 psi | 87% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,898 psi | 88% | 3018 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,288 psi | 85% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,652 psi | 87% | 2949 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,914 psi | 89% | 3058 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,493 psi | 88% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,738 psi | 86% | 3071 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,073 psi | 89% | 3054 fps | 97.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,073 psi | 89% | 3054 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,290 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,479 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,479 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,317 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,203 psi | 88% | 3045 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,778 psi | 78% | 2986 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,688 psi | 73% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,669 psi | 64% | 2828 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,911 psi | 84% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,259 psi | 85% | 2959 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 58,305 psi | 90% | 2989 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,778 psi | 78% | 2986 fps | 96.8% |
| Bofors RP7 | <<locked>> | 92% | 57,551 psi | 89% | 2969 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,682 psi | 90% | 2913 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,769 psi | 89% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,798 psi | 90% | 3009 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,579 psi | 86% | 3015 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 55,361 psi | 85% | 2972 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 55,941 psi | 86% | 2953 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,783 psi | 89% | 2995 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,159 psi | 86% | 2989 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,724 psi | 86% | 3051 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,303 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,072 psi | 88% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,608 psi | 87% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,854 psi | 86% | 2927 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,376 psi | 85% | 2910 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 58,276 psi | 90% | 2999 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,898 psi | 86% | 2946 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 57,348 psi | 88% | 3009 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,506 psi | 85% | 2969 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,392 psi | 88% | 2982 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 82% | 57,493 psi | 88% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,767 psi | 86% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,885 psi | 89% | 2920 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,260 psi | 87% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,622 psi | 86% | 2940 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 57,000 psi | 88% | 2982 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,250 psi | 65% | 2746 fps | 97.1% |
| Norma 201 | <<locked>> | 84% | 57,522 psi | 88% | 2936 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,262 psi | 90% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,724 psi | 87% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,477 psi | 85% | 2992 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,751 psi | 83% | 3071 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 55,564 psi | 85% | 3002 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,624 psi | 89% | 3005 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,957 psi | 89% | 3058 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 57,711 psi | 89% | 2966 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,769 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,912 psi | 57% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,740 psi | 90% | 2989 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,726 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,813 psi | 90% | 3100 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,623 psi | 87% | 3041 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,535 psi | 85% | 3074 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,479 psi | 90% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,247 psi | 90% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,146 psi | 89% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,231 psi | 87% | 2972 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3031 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 92% | 57,551 psi | 89% | 2969 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,622 psi | 86% | 2940 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,767 psi | 86% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,260 psi | 87% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,000 psi | 88% | 2982 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,260 psi | 87% | 2992 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,797 psi | 87% | 2949 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,464 psi | 88% | 2966 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,479 psi | 90% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,898 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,550 psi | 85% | 2890 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,811 psi | 86% | 3025 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 58,044 psi | 89% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,217 psi | 86% | 2933 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,059 psi | 89% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,160 psi | 89% | 2963 fps | 95.9% |
| Somchem S365 | <<locked>> | 98% | 58,392 psi | 90% | 3058 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,174 psi | 88% | 3009 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 55,434 psi | 85% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,508 psi | 90% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,813 psi | 90% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,927 psi | 86% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,783 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2864 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 82% | 58,204 psi | 90% | 2940 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,087 psi | 88% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,884 psi | 88% | 3002 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 3005 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,754 psi | 89% | 2966 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,813 psi | 90% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,579 psi | 86% | 3015 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,018 psi | 66% | 2969 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,551 psi | 89% | 2972 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 2940 fps | 97% |
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% | 49,226 psi | 76% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,384 psi | 73% | 2756 fps | 96.6% |
| Accurate 3100 | <<locked>> | 90% | 36,071 psi | 55% | 2612 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,557 psi | 72% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,172 psi | 54% | 2608 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 52,083 psi | 80% | 2890 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,164 psi | 68% | 2736 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 47,674 psi | 73% | 2877 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,128 psi | 83% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,312 psi | 74% | 2946 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,630 psi | 73% | 2877 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,630 psi | 73% | 2877 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,570 psi | 69% | 2762 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,601 psi | 73% | 2828 fps | 99.7% |
| Alliant Reloder-16 | 48.7 gr | 80% | 34,621 psi | 53% | 2621 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,928 psi | 60% | 2746 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,050 psi | 72% | 2867 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,266 psi | 68% | 2858 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,601 psi | 44% | 2470 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,709 psi | 56% | 2707 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,040 psi | 51% | 2654 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,793 psi | 80% | 2900 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,628 psi | 69% | 2769 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 44,266 psi | 68% | 2858 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 42,177 psi | 65% | 2687 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,303 psi | 85% | 2864 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,824 psi | 83% | 2917 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,208 psi | 70% | 2779 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 39,827 psi | 61% | 2717 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 45,658 psi | 70% | 2795 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 52,634 psi | 81% | 2900 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,952 psi | 49% | 2510 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,095 psi | 76% | 2877 fps | 100% |
| Hodgdon Superformance | 58.2 gr | 84% | 41,800 psi | 64% | 2789 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 41% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,256 psi | 77% | 2844 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,069 psi | 82% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,441 psi | 71% | 2769 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,834 psi | 75% | 2799 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 42,627 psi | 66% | 2720 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,959 psi | 63% | 2664 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 33,968 psi | 52% | 2562 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 48,834 psi | 75% | 2861 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,998 psi | 83% | 2927 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 54,128 psi | 83% | 2890 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,185 psi | 80% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,082 psi | 79% | 2812 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,601 psi | 72% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,479 psi | 59% | 2615 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 39,160 psi | 60% | 2644 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 37,086 psi | 57% | 2635 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,908 psi | 78% | 2835 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,561 psi | 79% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,963 psi | 72% | 2818 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,617 psi | 75% | 2874 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 40,770 psi | 63% | 2815 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,027 psi | 54% | 2602 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 46,978 psi | 72% | 2835 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,419 psi | 56% | 2644 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 54,172 psi | 83% | 2910 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,157 psi | 83% | 2927 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,281 psi | 70% | 2759 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,140 psi | 79% | 2946 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,394 psi | 64% | 2812 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,911 psi | 54% | 2625 fps | 96.2% |
| ReloadSwiss RS 70 | 53.2 gr | 80% | 34,069 psi | 52% | 2618 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 55,042 psi | 85% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,515 psi | 75% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,959 psi | 65% | 2710 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,576 psi | 81% | 2913 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 46,151 psi | 71% | 2851 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 42,177 psi | 65% | 2687 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,479 psi | 59% | 2615 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,185 psi | 80% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,601 psi | 72% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,160 psi | 60% | 2644 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,062 psi | 66% | 2766 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,852 psi | 81% | 2887 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,488 psi | 78% | 2858 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,866 psi | 80% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,714 psi | 67% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,118 psi | 62% | 2612 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,716 psi | 70% | 2844 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,561 psi | 79% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,692 psi | 81% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,496 psi | 65% | 2717 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,447 psi | 84% | 2907 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 31,604 psi | 49% | 2559 fps | 98.6% |
| Somchem S385 | <<locked>> | 90% | 40,988 psi | 63% | 2717 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,373 psi | 81% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,617 psi | 75% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,733 psi | 75% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,466 psi | 62% | 2644 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,535 psi | 56% | 2608 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 43,163 psi | 66% | 2749 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 54,389 psi | 84% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,224 psi | 73% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,071 psi | 55% | 2608 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 31,531 psi | 49% | 2556 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,839 psi | 55% | 2579 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 55,027 psi | 85% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 39,827 psi | 61% | 2717 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,079 psi | 42% | 2497 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,430 psi | 78% | 2864 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,427 psi | 71% | 2815 fps | 95.3% |
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 106 powders for .280 Ackley Improved loaded with the .284 | 140gr | Nosler CT FailSafe. 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 106 of the 106 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 1:12.5 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. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Nosler CT FailSafe 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.