Load Specifications
Bullet Manufacturer:Swift
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:1:9.5
Load data in caliber .280 Ackley Improved with .284 | 150gr | Swift Scirocco 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% | 55,753 psi | 86% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,435 psi | 88% | 2818 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,430 psi | 78% | 2795 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 56,217 psi | 86% | 2805 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,652 psi | 87% | 2907 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,245 psi | 85% | 2831 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,289 psi | 87% | 2835 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2946 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,435 psi | 88% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,448 psi | 85% | 2956 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,029 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,464 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,290 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,824 psi | 84% | 2936 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,652 psi | 87% | 2933 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,357 psi | 77% | 2877 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,311 psi | 73% | 2815 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,466 psi | 64% | 2730 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,085 psi | 83% | 3005 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 58,740 psi | 90% | 2900 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,151 psi | 71% | 2799 fps | 95.9% |
| Bofors RP3 | <<locked>> | 88% | 57,957 psi | 89% | 2877 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,357 psi | 77% | 2877 fps | 97.1% |
| Bofors RP7 | <<locked>> | 92% | 57,305 psi | 88% | 2858 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,798 psi | 90% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,609 psi | 89% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,566 psi | 90% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,158 psi | 85% | 2904 fps | 99% |
| Hodgdon H4350 | <<locked>> | 90% | 55,216 psi | 85% | 2864 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 82% | 55,840 psi | 86% | 2841 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,667 psi | 89% | 2884 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,970 psi | 86% | 2877 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,332 psi | 85% | 2940 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 56% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,840 psi | 87% | 2841 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,521 psi | 87% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,927 psi | 86% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,288 psi | 85% | 2802 fps | 98.9% |
| IMR 4350 | <<locked>> | 96% | 58,276 psi | 90% | 2890 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,564 psi | 85% | 2835 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 56,971 psi | 88% | 2897 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,317 psi | 85% | 2858 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,174 psi | 88% | 2874 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 82% | 57,435 psi | 88% | 2828 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,637 psi | 86% | 2805 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,493 psi | 88% | 2802 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,028 psi | 86% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,405 psi | 85% | 2828 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 56,724 psi | 87% | 2871 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,916 psi | 64% | 2644 fps | 97.5% |
| Norma 201 | <<locked>> | 84% | 57,435 psi | 88% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,233 psi | 90% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,710 psi | 87% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,303 psi | 85% | 2887 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2959 fps | 98.9% |
| Norma URP | <<locked>> | 96% | 58,769 psi | 90% | 2943 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,566 psi | 89% | 2897 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,667 psi | 89% | 2946 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 57,595 psi | 89% | 2854 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,638 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,912 psi | 57% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,334 psi | 90% | 2877 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,465 psi | 90% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,334 psi | 90% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,217 psi | 86% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,998 psi | 85% | 2959 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 58,291 psi | 90% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,986 psi | 89% | 2822 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,769 psi | 89% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,738 psi | 86% | 2861 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,014 psi | 86% | 2920 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 57,305 psi | 88% | 2858 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,405 psi | 85% | 2828 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,637 psi | 86% | 2805 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,028 psi | 86% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,724 psi | 87% | 2871 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,811 psi | 86% | 2877 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,391 psi | 87% | 2835 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,232 psi | 88% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,436 psi | 90% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,666 psi | 86% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,288 psi | 85% | 2782 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2917 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 57,957 psi | 89% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,144 psi | 86% | 2822 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,957 psi | 89% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 57,725 psi | 89% | 2858 fps | 96.3% |
| Somchem S365 | <<locked>> | 98% | 57,841 psi | 89% | 2940 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,739 psi | 87% | 2897 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 55,535 psi | 85% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,334 psi | 90% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,711 psi | 90% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,550 psi | 85% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,624 psi | 89% | 2887 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,791 psi | 75% | 2756 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 82% | 57,914 psi | 89% | 2825 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,956 psi | 88% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,608 psi | 87% | 2894 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,156 psi | 82% | 2897 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,838 psi | 83% | 2946 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,319 psi | 88% | 2854 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,769 psi | 90% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,419 psi | 85% | 2907 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,612 psi | 66% | 2861 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,450 psi | 88% | 2864 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2835 fps | 97.4% |
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% | 49,052 psi | 75% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,181 psi | 73% | 2654 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 35,868 psi | 55% | 2520 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 46,427 psi | 71% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,983 psi | 54% | 2513 fps | 97.2% |
| ADI AR 2206H | <<locked>> | 80% | 51,808 psi | 80% | 2779 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,005 psi | 68% | 2631 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 44,483 psi | 68% | 2717 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,896 psi | 83% | 2776 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,211 psi | 74% | 2838 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,251 psi | 68% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,384 psi | 73% | 2723 fps | 99.8% |
| Alliant Reloder-16 | 46 gr | 80% | 34,519 psi | 53% | 2526 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,754 psi | 60% | 2648 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,947 psi | 68% | 2710 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,063 psi | 68% | 2756 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,731 psi | 41% | 2329 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,403 psi | 53% | 2559 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,808 psi | 50% | 2562 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,517 psi | 79% | 2792 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,192 psi | 66% | 2740 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 44,440 psi | 68% | 2664 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,063 psi | 68% | 2756 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 41,974 psi | 65% | 2589 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,245 psi | 85% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,722 psi | 83% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,860 psi | 69% | 2674 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 39,682 psi | 61% | 2618 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 82% | 42,685 psi | 66% | 2638 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 52,359 psi | 81% | 2789 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,995 psi | 49% | 2425 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,907 psi | 75% | 2769 fps | 100% |
| Hodgdon Superformance | 55 gr | 84% | 41,597 psi | 64% | 2690 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,241 psi | 77% | 2740 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,823 psi | 81% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,253 psi | 71% | 2664 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,718 psi | 75% | 2694 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 39,914 psi | 61% | 2569 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,930 psi | 63% | 2569 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 33,750 psi | 52% | 2470 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 48,559 psi | 75% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,621 psi | 82% | 2818 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 53,896 psi | 83% | 2776 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,098 psi | 80% | 2756 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,908 psi | 78% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,441 psi | 71% | 2664 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,377 psi | 59% | 2516 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 39,030 psi | 60% | 2549 fps | 95.8% |
| Lovex S071 | <<locked>> | 94% | 34,664 psi | 53% | 2490 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 50,778 psi | 78% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,169 psi | 79% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,760 psi | 72% | 2710 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,063 psi | 69% | 2710 fps | 95.3% |
| Norma MRP | <<locked>> | 92% | 40,553 psi | 62% | 2717 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,983 psi | 54% | 2510 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 46,891 psi | 72% | 2730 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,303 psi | 56% | 2552 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 53,896 psi | 83% | 2799 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,838 psi | 83% | 2815 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 42% | 1601 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,063 psi | 69% | 2657 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,126 psi | 79% | 2841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,205 psi | 63% | 2707 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,737 psi | 53% | 2530 fps | 96.7% |
| ReloadSwiss RS 70 | 50.3 gr | 80% | 34,026 psi | 52% | 2533 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 54,998 psi | 85% | 2753 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,283 psi | 74% | 2677 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,901 psi | 64% | 2615 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,168 psi | 76% | 2753 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 42,917 psi | 66% | 2690 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 41,974 psi | 65% | 2589 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,377 psi | 59% | 2516 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,098 psi | 80% | 2756 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,441 psi | 71% | 2664 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,030 psi | 60% | 2549 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,018 psi | 66% | 2667 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,823 psi | 81% | 2782 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,430 psi | 78% | 2753 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,532 psi | 79% | 2657 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,395 psi | 67% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,492 psi | 58% | 2461 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,511 psi | 65% | 2687 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,387 psi | 79% | 2661 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,402 psi | 81% | 2769 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,395 psi | 65% | 2615 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 54,157 psi | 83% | 2802 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 31,575 psi | 49% | 2470 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 40,857 psi | 63% | 2618 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 52,025 psi | 80% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,283 psi | 74% | 2644 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,660 psi | 75% | 2657 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,364 psi | 62% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,347 psi | 56% | 2513 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 42,888 psi | 66% | 2651 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 54,230 psi | 83% | 2772 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,862 psi | 72% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,795 psi | 55% | 2513 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 29,153 psi | 45% | 2405 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 98% | 50,357 psi | 77% | 2887 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,636 psi | 55% | 2484 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 54,781 psi | 84% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 39,682 psi | 61% | 2618 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,890 psi | 41% | 2415 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,285 psi | 77% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,369 psi | 71% | 2720 fps | 95.8% |
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 120 powders for .280 Ackley Improved loaded with the .284 | 150gr | Swift Scirocco. Alliant Reloder-26 delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,005 fps. Accurate 3100 gives the best case fill at 100 %, and 120 of the 120 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.