Load Specifications
Bullet Manufacturer:Alaska Bullet Works
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 | Alaska Bullet Works Kodiak SP SPBC 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, 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% | 55,811 psi | 86% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,363 psi | 88% | 2923 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,647 psi | 78% | 2897 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 56,043 psi | 86% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,811 psi | 87% | 3018 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,259 psi | 85% | 2940 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,347 psi | 87% | 2943 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,928 psi | 89% | 3058 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,450 psi | 88% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,724 psi | 86% | 3071 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,246 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,435 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,464 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,940 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,855 psi | 87% | 3038 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,459 psi | 78% | 2976 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,674 psi | 73% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,655 psi | 64% | 2828 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 3117 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,216 psi | 85% | 2956 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 57,943 psi | 89% | 2982 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,459 psi | 78% | 2976 fps | 96.7% |
| Bofors RP7 | <<locked>> | 92% | 57,493 psi | 88% | 2966 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,653 psi | 90% | 2913 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,435 psi | 88% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,479 psi | 90% | 3002 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,288 psi | 85% | 3009 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 55,303 psi | 85% | 2969 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 55,854 psi | 86% | 2949 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,769 psi | 89% | 2992 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,086 psi | 86% | 2989 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,680 psi | 86% | 3048 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 56% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,985 psi | 88% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,521 psi | 87% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,840 psi | 86% | 2927 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,740 psi | 90% | 2963 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 58,247 psi | 90% | 2995 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,579 psi | 86% | 2940 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 56,971 psi | 88% | 3005 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,419 psi | 85% | 2969 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,377 psi | 88% | 2979 fps | 96% |
| IMR 8208 XBR | <<locked>> | 82% | 57,450 psi | 88% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,738 psi | 86% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,551 psi | 89% | 2913 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,927 psi | 86% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,608 psi | 86% | 2936 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 56,666 psi | 87% | 2976 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,003 psi | 65% | 2740 fps | 97% |
| Norma 201 | <<locked>> | 84% | 57,493 psi | 88% | 2936 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,233 psi | 90% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,710 psi | 87% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,463 psi | 85% | 2992 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,461 psi | 82% | 3064 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 55,245 psi | 85% | 2999 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,595 psi | 89% | 3005 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,957 psi | 89% | 3054 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 57,682 psi | 89% | 2963 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,754 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 57% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,682 psi | 90% | 2989 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,668 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,450 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,623 psi | 87% | 3038 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,187 psi | 85% | 3064 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,392 psi | 90% | 2910 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,218 psi | 90% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,073 psi | 89% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,927 psi | 86% | 2966 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,260 psi | 87% | 3028 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 92% | 57,493 psi | 88% | 2966 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,608 psi | 86% | 2936 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,738 psi | 86% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,927 psi | 86% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,666 psi | 87% | 2976 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,941 psi | 86% | 2986 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,463 psi | 87% | 2943 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,421 psi | 88% | 2966 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,421 psi | 90% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,840 psi | 86% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,535 psi | 85% | 2890 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,753 psi | 86% | 3022 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 57,957 psi | 89% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,202 psi | 86% | 2933 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,044 psi | 89% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,131 psi | 89% | 2963 fps | 95.9% |
| Somchem S365 | <<locked>> | 98% | 57,986 psi | 89% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3002 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 58,813 psi | 90% | 2844 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,436 psi | 90% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,784 psi | 90% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,883 psi | 86% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,769 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,008 psi | 75% | 2858 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 82% | 58,146 psi | 89% | 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% | 53,243 psi | 82% | 3002 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,464 psi | 88% | 2963 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,726 psi | 90% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,564 psi | 85% | 3015 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,033 psi | 66% | 2966 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,479 psi | 88% | 2972 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2936 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% | 49,153 psi | 76% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,094 psi | 72% | 2753 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 36,013 psi | 55% | 2608 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,514 psi | 72% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,085 psi | 54% | 2605 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 51,982 psi | 80% | 2887 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,121 psi | 68% | 2733 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 47,659 psi | 73% | 2877 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,085 psi | 83% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,225 psi | 74% | 2943 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,280 psi | 68% | 2756 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,558 psi | 73% | 2828 fps | 99.7% |
| Alliant Reloder-16 | 48.6 gr | 80% | 34,548 psi | 53% | 2618 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,885 psi | 60% | 2746 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,036 psi | 72% | 2867 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 47,137 psi | 73% | 2917 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,543 psi | 44% | 2467 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,666 psi | 56% | 2703 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,808 psi | 50% | 2648 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,735 psi | 80% | 2900 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,541 psi | 69% | 2769 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 47,137 psi | 73% | 2917 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 42,090 psi | 65% | 2687 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,259 psi | 85% | 2864 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,751 psi | 83% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,918 psi | 69% | 2772 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 39,595 psi | 61% | 2710 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 45,614 psi | 70% | 2795 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 52,591 psi | 81% | 2897 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,908 psi | 49% | 2510 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,052 psi | 75% | 2874 fps | 100% |
| Hodgdon Superformance | 58 gr | 84% | 41,553 psi | 64% | 2782 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 42% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,169 psi | 77% | 2844 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,997 psi | 82% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,340 psi | 71% | 2766 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,559 psi | 75% | 2792 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 42,554 psi | 65% | 2717 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,930 psi | 63% | 2664 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 33,736 psi | 52% | 2559 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 48,776 psi | 75% | 2858 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,751 psi | 83% | 2920 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 54,085 psi | 83% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,083 psi | 80% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,039 psi | 79% | 2812 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,543 psi | 72% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,435 psi | 59% | 2612 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 39,102 psi | 60% | 2644 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 36,999 psi | 57% | 2631 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,836 psi | 78% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,213 psi | 79% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,934 psi | 72% | 2815 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,341 psi | 74% | 2867 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 40,538 psi | 62% | 2808 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,983 psi | 54% | 2602 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 46,920 psi | 72% | 2831 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,376 psi | 56% | 2644 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 54,114 psi | 83% | 2907 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,128 psi | 83% | 2923 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 42% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,208 psi | 70% | 2756 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,097 psi | 79% | 2946 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,307 psi | 64% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,635 psi | 53% | 2615 fps | 96.1% |
| ReloadSwiss RS 70 | 53.1 gr | 80% | 34,040 psi | 52% | 2618 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 54,984 psi | 85% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,414 psi | 74% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,872 psi | 64% | 2710 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,547 psi | 81% | 2910 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 45,847 psi | 71% | 2844 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 42,090 psi | 65% | 2687 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,435 psi | 59% | 2612 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,083 psi | 80% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,543 psi | 72% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,102 psi | 60% | 2644 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,004 psi | 66% | 2762 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,837 psi | 81% | 2887 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,401 psi | 78% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,808 psi | 80% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,671 psi | 67% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,089 psi | 62% | 2608 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,440 psi | 70% | 2841 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,459 psi | 79% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,605 psi | 81% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,438 psi | 65% | 2713 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,157 psi | 83% | 2900 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 31,546 psi | 49% | 2556 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 43,816 psi | 67% | 2776 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,315 psi | 80% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,544 psi | 75% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,689 psi | 75% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,393 psi | 62% | 2641 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,477 psi | 56% | 2605 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 42,888 psi | 66% | 2743 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 54,360 psi | 84% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,920 psi | 72% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,839 psi | 55% | 2602 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 31,270 psi | 48% | 2546 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,795 psi | 55% | 2579 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 54,955 psi | 85% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 39,798 psi | 61% | 2713 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,890 psi | 41% | 2490 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,372 psi | 77% | 2864 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,398 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 104 powders for .280 Ackley Improved loaded with the .284 | 140gr | Alaska Bullet Works Kodiak SP SPBC. Alliant Reloder-26 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,117 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 1:12.5 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, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Alaska Bullet Works Kodiak SP SPBC 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.