Load Specifications
Bullet:.284 | 145gr | Speer Hot-Cor
Bullet Manufacturer:Speer
Bullet Weight:145 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 | 145gr | Speer Hot-Cor bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-26.
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% | 57,711 psi | 89% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,564 psi | 85% | 2858 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 2894 fps | 99.3% |
| Accurate 4064 | <<locked>> | 86% | 58,218 psi | 90% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,216 psi | 85% | 2949 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,898 psi | 88% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,262 psi | 90% | 2927 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,115 psi | 86% | 2989 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,853 psi | 83% | 2976 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,653 psi | 89% | 3054 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,593 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,753 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,840 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,319 psi | 88% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,564 psi | 85% | 2976 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,634 psi | 81% | 2972 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,792 psi | 77% | 2913 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,366 psi | 67% | 2828 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,508 psi | 88% | 3114 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,188 psi | 88% | 2943 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,385 psi | 74% | 2897 fps | 96.5% |
| Bofors RP3 | <<locked>> | 86% | 56,289 psi | 87% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,634 psi | 81% | 2972 fps | 97.6% |
| Bofors RP7 | <<locked>> | 90% | 55,695 psi | 86% | 2897 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 56,710 psi | 87% | 2933 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,435 psi | 88% | 2999 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 57,334 psi | 88% | 2959 fps | 98.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,725 psi | 89% | 2982 fps | 96.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,536 psi | 87% | 2963 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 57,595 psi | 89% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,405 psi | 87% | 2930 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,957 psi | 89% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,015 psi | 89% | 3041 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 56% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,668 psi | 90% | 2930 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,436 psi | 90% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,783 psi | 89% | 2910 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,840 psi | 87% | 2890 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 56,492 psi | 87% | 2930 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,406 psi | 88% | 2927 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 55,680 psi | 86% | 2940 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,203 psi | 88% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,593 psi | 86% | 2913 fps | 96.2% |
| Lovex D073.6 | <<locked>> | 82% | 57,609 psi | 89% | 2897 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,695 psi | 86% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,914 psi | 89% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,522 psi | 88% | 2923 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 58,726 psi | 90% | 2966 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,947 psi | 68% | 2740 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 55,680 psi | 86% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,449 psi | 87% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,465 psi | 90% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,580 psi | 89% | 2986 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 56,101 psi | 86% | 3064 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 57,435 psi | 88% | 2986 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,724 psi | 86% | 2933 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,474 psi | 79% | 2959 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 94% | 56,333 psi | 87% | 2989 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,919 psi | 71% | 2831 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,028 psi | 57% | 1854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,652 psi | 87% | 2917 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,724 psi | 87% | 2989 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,855 psi | 87% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,129 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,435 psi | 88% | 3058 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,279 psi | 65% | 2841 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,405 psi | 87% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,420 psi | 87% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,943 psi | 89% | 2959 fps | 97.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,595 psi | 90% | 3022 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 55,695 psi | 86% | 2897 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,522 psi | 88% | 2923 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,609 psi | 89% | 2897 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,914 psi | 89% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 58,726 psi | 90% | 2966 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,044 psi | 89% | 2969 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,479 psi | 90% | 2930 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,448 psi | 85% | 2894 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,463 psi | 87% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,450 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,145 psi | 88% | 2874 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 3015 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 56,188 psi | 86% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,233 psi | 90% | 2917 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,333 psi | 87% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,304 psi | 87% | 2897 fps | 96.1% |
| Somchem S365 | <<locked>> | 96% | 56,826 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,564 psi | 85% | 2940 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 56,927 psi | 88% | 2772 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,681 psi | 87% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,000 psi | 88% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,595 psi | 89% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,086 psi | 86% | 2927 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,995 psi | 78% | 2854 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 86% | 58,755 psi | 90% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,259 psi | 85% | 2933 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2989 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 3051 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,753 psi | 86% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,740 psi | 89% | 3005 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,933 psi | 69% | 2966 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,521 psi | 85% | 2900 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,680 psi | 86% | 2933 fps | 97.8% |
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% | 50,908 psi | 78% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,762 psi | 75% | 2743 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 35,201 psi | 54% | 2552 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 48,196 psi | 74% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,637 psi | 56% | 2602 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 80% | 53,635 psi | 83% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,513 psi | 70% | 2717 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 46,267 psi | 71% | 2812 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 50,546 psi | 78% | 2917 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,285 psi | 77% | 2936 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,064 psi | 71% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,124 psi | 76% | 2815 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,824 psi | 55% | 2612 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,364 psi | 62% | 2736 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,004 psi | 66% | 2746 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,105 psi | 66% | 2792 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,905 psi | 43% | 2415 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,663 psi | 52% | 2589 fps | 95.1% |
| Alliant Reloder-26 | 56.7 gr | 84% | 31,908 psi | 49% | 2585 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,359 psi | 82% | 2884 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 45,194 psi | 70% | 2835 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,195 psi | 71% | 2753 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,105 psi | 66% | 2792 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 40,654 psi | 63% | 2618 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 46,688 psi | 72% | 2766 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 38,580 psi | 59% | 2648 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 44,353 psi | 68% | 2730 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 98% | 54,172 psi | 83% | 2927 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,055 psi | 82% | 2907 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 54,215 psi | 83% | 2881 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,214 psi | 51% | 2503 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,734 psi | 78% | 2858 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,248 psi | 62% | 2717 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 42% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,750 psi | 80% | 2825 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,868 psi | 84% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,834 psi | 74% | 2753 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,183 psi | 77% | 2782 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 41,379 psi | 64% | 2654 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,206 psi | 65% | 2654 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 35,128 psi | 54% | 2552 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 50,401 psi | 78% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,330 psi | 81% | 2861 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 80% | 53,882 psi | 83% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,475 psi | 81% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,080 psi | 74% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,740 psi | 61% | 2602 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 37,869 psi | 58% | 2579 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 36,390 psi | 56% | 2579 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 52,431 psi | 81% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,113 psi | 82% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,486 psi | 75% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 88% | 46,963 psi | 72% | 2805 fps | 95.9% |
| Norma MRP | <<locked>> | 90% | 39,552 psi | 61% | 2746 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,390 psi | 56% | 2595 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 48,805 psi | 75% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,935 psi | 74% | 2890 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 35,302 psi | 54% | 2579 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 42,743 psi | 66% | 2766 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,673 psi | 72% | 2746 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,968 psi | 81% | 2930 fps | 100% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 42,902 psi | 66% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,332 psi | 56% | 2618 fps | 97.2% |
| ReloadSwiss RS 70 | 53.6 gr | 80% | 35,447 psi | 55% | 2621 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,523 psi | 61% | 2772 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 77% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,468 psi | 67% | 2697 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,935 psi | 74% | 2789 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 44,860 psi | 69% | 2789 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 40,654 psi | 63% | 2618 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,740 psi | 61% | 2602 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,882 psi | 83% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,080 psi | 74% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,869 psi | 58% | 2579 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,556 psi | 69% | 2753 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,505 psi | 84% | 2871 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,982 psi | 80% | 2838 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,026 psi | 82% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,817 psi | 69% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,899 psi | 60% | 2546 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,454 psi | 68% | 2782 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,953 psi | 81% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,273 psi | 83% | 2858 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,903 psi | 68% | 2700 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,518 psi | 81% | 2838 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,895 psi | 51% | 2552 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 39,929 psi | 61% | 2654 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 53,577 psi | 82% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,980 psi | 77% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,227 psi | 77% | 2743 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,814 psi | 64% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,869 psi | 58% | 2598 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 41,959 psi | 65% | 2687 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,660 psi | 75% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,376 psi | 58% | 2598 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 28,703 psi | 44% | 2434 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 98% | 52,750 psi | 81% | 2989 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,028 psi | 57% | 2569 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 38,580 psi | 59% | 2648 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,310 psi | 40% | 2438 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,996 psi | 80% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,049 psi | 69% | 2753 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 103 powders for .280 Ackley Improved loaded with the .284 | 145gr | Speer Hot-Cor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,114 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 60, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .280 Ackley Improved with the .284 | 145gr | Speer Hot-Cor 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.