Load Specifications
Bullet Manufacturer:Norma
Bullet Weight:150 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 | 150gr | Norma Soft Point 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, Alliant Reloder-26 and Alliant Reloder-16.
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% | 58,711 psi | 90% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,231 psi | 87% | 2822 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,056 psi | 83% | 2864 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 55,506 psi | 85% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,231 psi | 87% | 2917 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,115 psi | 86% | 3002 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 82% | 57,827 psi | 89% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,463 psi | 85% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,159 psi | 88% | 2959 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,911 psi | 84% | 2953 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,595 psi | 90% | 3018 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,304 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,449 psi | 87% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,782 psi | 87% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 58,436 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,289 psi | 87% | 2943 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2946 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,546 psi | 78% | 2877 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,034 psi | 68% | 2802 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 3077 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 58,001 psi | 89% | 2907 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,153 psi | 76% | 2867 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 57,363 psi | 88% | 2881 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2946 fps | 98.1% |
| Bofors RP7 | <<locked>> | 90% | 56,449 psi | 87% | 2864 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 57,522 psi | 88% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,465 psi | 90% | 2969 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 58,189 psi | 90% | 2927 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 98% | 54,926 psi | 85% | 2894 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,638 psi | 89% | 2936 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 82% | 58,494 psi | 90% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,087 psi | 88% | 2890 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,274 psi | 85% | 2877 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,708 psi | 84% | 2943 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 56% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,811 psi | 86% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,436 psi | 90% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,464 psi | 88% | 2854 fps | 99.4% |
| IMR 4350 | <<locked>> | 94% | 57,392 psi | 88% | 2897 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,189 psi | 90% | 2890 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 56,652 psi | 87% | 2907 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,885 psi | 89% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,550 psi | 87% | 2884 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,040 psi | 80% | 2917 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 58,320 psi | 90% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,463 psi | 87% | 2805 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,595 psi | 90% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 58,320 psi | 90% | 2887 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 56,130 psi | 86% | 2877 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,846 psi | 69% | 2710 fps | 98.4% |
| Norma 201 | <<locked>> | 82% | 56,536 psi | 87% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,348 psi | 88% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,738 psi | 86% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,610 psi | 90% | 2953 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 57,130 psi | 88% | 3035 fps | 99.5% |
| Norma URP | <<locked>> | 94% | 58,436 psi | 90% | 2953 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,565 psi | 87% | 2897 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,344 psi | 81% | 2933 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 57,406 psi | 88% | 2956 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,760 psi | 72% | 2805 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,421 psi | 88% | 2881 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,522 psi | 88% | 2953 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,914 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,912 psi | 86% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,581 psi | 90% | 3025 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,047 psi | 66% | 2822 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 84% | 57,261 psi | 88% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,261 psi | 88% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,114 psi | 85% | 2871 fps | 97% |
| Rottweil R 905 | <<locked>> | 98% | 55,695 psi | 86% | 2930 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,449 psi | 87% | 2864 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 92% | 58,320 psi | 90% | 2887 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,320 psi | 90% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,595 psi | 90% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,130 psi | 86% | 2877 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,158 psi | 85% | 2881 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,115 psi | 86% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,159 psi | 88% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,059 psi | 89% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,986 psi | 89% | 2841 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,216 psi | 85% | 2927 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 57,000 psi | 88% | 2753 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,087 psi | 88% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,130 psi | 88% | 2867 fps | 96.6% |
| Somchem S365 | <<locked>> | 96% | 58,001 psi | 89% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,333 psi | 87% | 2907 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 57,696 psi | 89% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,595 psi | 89% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,928 psi | 89% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,711 psi | 90% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,985 psi | 88% | 2890 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 2828 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 56,072 psi | 86% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,912 psi | 86% | 2897 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,869 psi | 87% | 2959 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,435 psi | 88% | 3022 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,811 psi | 87% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,726 psi | 90% | 2972 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,759 psi | 70% | 2936 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,536 psi | 87% | 2864 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,565 psi | 87% | 2900 fps | 98.2% |
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% | 51,735 psi | 80% | 2707 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,298 psi | 76% | 2710 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 33,591 psi | 52% | 2474 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 49,023 psi | 75% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,188 psi | 57% | 2572 fps | 98% |
| Accurate MAGPRO | <<locked>> | 98% | 52,301 psi | 80% | 2940 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 54,186 psi | 83% | 2831 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,151 psi | 71% | 2684 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,106 psi | 68% | 2726 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 96% | 47,805 psi | 74% | 2822 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,995 psi | 78% | 2900 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,557 psi | 72% | 2710 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,661 psi | 76% | 2776 fps | 100% |
| Alliant Reloder-16 | 48.4 gr | 80% | 36,274 psi | 56% | 2582 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,191 psi | 63% | 2713 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,714 psi | 67% | 2720 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,932 psi | 68% | 2769 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,701 psi | 41% | 2339 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,258 psi | 53% | 2569 fps | 95.9% |
| Alliant Reloder-26 | 56.1 gr | 84% | 32,576 psi | 50% | 2566 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,085 psi | 83% | 2848 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 43,105 psi | 66% | 2749 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 47,021 psi | 72% | 2723 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,932 psi | 68% | 2769 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 41,321 psi | 64% | 2592 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 47,253 psi | 73% | 2730 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 39,117 psi | 60% | 2618 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,192 psi | 65% | 2644 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 96% | 51,271 psi | 79% | 2831 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,169 psi | 77% | 2815 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 54,781 psi | 84% | 2838 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,837 psi | 52% | 2480 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,721 psi | 80% | 2828 fps | 100% |
| Hodgdon Superformance | <<locked>> | 80% | 38,072 psi | 59% | 2625 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 42% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,518 psi | 81% | 2792 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,559 psi | 75% | 2720 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,676 psi | 78% | 2746 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 39,450 psi | 61% | 2572 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,627 psi | 66% | 2621 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,824 psi | 55% | 2526 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 50,966 psi | 78% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,850 psi | 77% | 2772 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 48,805 psi | 75% | 2854 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 54,810 psi | 84% | 2805 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,156 psi | 82% | 2756 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,776 psi | 75% | 2717 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,364 psi | 62% | 2575 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 38,522 psi | 59% | 2552 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 34,708 psi | 53% | 2500 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 53,200 psi | 82% | 2776 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,650 psi | 83% | 2772 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,037 psi | 75% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,570 psi | 69% | 2713 fps | 95.5% |
| Norma MRP | <<locked>> | 88% | 37,666 psi | 58% | 2661 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 37,086 psi | 57% | 2569 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 49,516 psi | 76% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 48,994 psi | 75% | 2871 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,984 psi | 55% | 2556 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 40,495 psi | 62% | 2680 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,195 psi | 73% | 2710 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,954 psi | 83% | 2897 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,772 psi | 67% | 2766 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,970 psi | 57% | 2589 fps | 97.7% |
| ReloadSwiss RS 70 | 53 gr | 80% | 35,969 psi | 55% | 2595 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,234 psi | 62% | 2753 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,691 psi | 78% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,222 psi | 68% | 2667 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 48,675 psi | 75% | 2759 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 42,627 psi | 66% | 2700 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 41,321 psi | 64% | 2592 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,364 psi | 62% | 2575 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,810 psi | 84% | 2805 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,776 psi | 75% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,522 psi | 59% | 2552 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,411 psi | 70% | 2723 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,837 psi | 81% | 2805 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,693 psi | 83% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,411 psi | 70% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,537 psi | 61% | 2520 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,235 psi | 65% | 2694 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 53,708 psi | 83% | 2707 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,643 psi | 69% | 2667 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 53,534 psi | 82% | 2812 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 33,576 psi | 52% | 2530 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 40,596 psi | 62% | 2628 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 54,259 psi | 83% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,734 psi | 78% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,981 psi | 78% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,496 psi | 65% | 2595 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,392 psi | 59% | 2569 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 39,900 psi | 61% | 2605 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 49,211 psi | 76% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,898 psi | 58% | 2569 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,341 psi | 45% | 2415 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 50,082 psi | 77% | 2897 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,579 psi | 58% | 2539 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,320 psi | 60% | 2621 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,048 psi | 39% | 2356 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,663 psi | 81% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,815 psi | 66% | 2667 fps | 95.2% |
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 | 150gr | Norma Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,077 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 150.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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-26, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Norma Soft Point 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.