Load Specifications
Bullet Manufacturer:Prvi Partizan
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 | Prvi Partizan SP 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% | 57,508 psi | 88% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,376 psi | 85% | 2851 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,750 psi | 81% | 2887 fps | 99.3% |
| Accurate 4064 | <<locked>> | 86% | 58,044 psi | 89% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 58,784 psi | 90% | 2999 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,724 psi | 87% | 2917 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,088 psi | 89% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,014 psi | 86% | 2986 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,766 psi | 83% | 2972 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,479 psi | 88% | 3048 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,114 psi | 85% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,593 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,680 psi | 86% | 2999 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,174 psi | 88% | 3028 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,129 psi | 85% | 2969 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,489 psi | 81% | 2969 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,342 psi | 76% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,236 psi | 67% | 2825 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,058 psi | 88% | 3107 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,753 psi | 87% | 2933 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,008 psi | 74% | 2887 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 56,101 psi | 86% | 2910 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,489 psi | 81% | 2969 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 55,579 psi | 86% | 2894 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 56,565 psi | 87% | 2927 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 57,261 psi | 88% | 2995 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 56,884 psi | 88% | 2953 fps | 98.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,667 psi | 89% | 2979 fps | 96.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,463 psi | 87% | 2959 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 57,406 psi | 88% | 2927 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,898 psi | 86% | 2920 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,798 psi | 89% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,595 psi | 89% | 3035 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 56% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,508 psi | 90% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,218 psi | 90% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,305 psi | 88% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,695 psi | 87% | 2887 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 56,347 psi | 87% | 2923 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,290 psi | 88% | 2923 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 55,535 psi | 85% | 2936 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,029 psi | 88% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,521 psi | 85% | 2910 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 57,363 psi | 88% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,521 psi | 85% | 2838 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,754 psi | 89% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,101 psi | 88% | 2917 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 58,566 psi | 90% | 2959 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,816 psi | 67% | 2736 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 55,492 psi | 85% | 2858 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,260 psi | 87% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,276 psi | 90% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,435 psi | 88% | 2982 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 55,709 psi | 86% | 3058 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 57,334 psi | 88% | 2982 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,535 psi | 85% | 2927 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,372 psi | 79% | 2956 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 94% | 56,231 psi | 87% | 2982 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,847 psi | 71% | 2828 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 57% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,507 psi | 87% | 2910 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,521 psi | 87% | 2986 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,681 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 58,566 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,276 psi | 88% | 3054 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,221 psi | 65% | 2838 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 56,217 psi | 86% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,231 psi | 87% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,812 psi | 89% | 2956 fps | 97.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,131 psi | 89% | 3012 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 55,579 psi | 86% | 2894 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,101 psi | 88% | 2917 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,363 psi | 88% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,754 psi | 89% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 58,566 psi | 90% | 2959 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,885 psi | 89% | 2969 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,320 psi | 90% | 2927 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,259 psi | 85% | 2887 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,246 psi | 87% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,290 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,072 psi | 88% | 2871 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3009 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 56,014 psi | 86% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,783 psi | 89% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,188 psi | 86% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,970 psi | 86% | 2890 fps | 96% |
| Somchem S365 | <<locked>> | 96% | 56,666 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,129 psi | 85% | 2933 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 56,724 psi | 87% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,463 psi | 87% | 2818 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,826 psi | 87% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,464 psi | 88% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,912 psi | 86% | 2923 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,923 psi | 78% | 2848 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 86% | 58,552 psi | 90% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 58,624 psi | 90% | 2982 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2989 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,057 psi | 86% | 3045 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,637 psi | 86% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,261 psi | 88% | 2995 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,599 psi | 69% | 2959 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,376 psi | 85% | 2894 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,332 psi | 85% | 2927 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% | 50,691 psi | 78% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,370 psi | 74% | 2736 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 35,041 psi | 54% | 2549 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 47,993 psi | 74% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,463 psi | 56% | 2598 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 80% | 53,447 psi | 82% | 2867 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,339 psi | 70% | 2713 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 46,122 psi | 71% | 2808 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 50,169 psi | 77% | 2907 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,821 psi | 77% | 2927 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,876 psi | 71% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,936 psi | 75% | 2808 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,665 psi | 55% | 2608 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,219 psi | 62% | 2733 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,585 psi | 70% | 2799 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,975 psi | 66% | 2789 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,789 psi | 43% | 2408 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,547 psi | 52% | 2585 fps | 95% |
| Alliant Reloder-26 | 56.5 gr | 84% | 31,792 psi | 49% | 2582 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,214 psi | 82% | 2881 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 45,092 psi | 69% | 2831 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,006 psi | 71% | 2749 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,975 psi | 66% | 2789 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 40,495 psi | 62% | 2615 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 46,514 psi | 72% | 2759 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 38,406 psi | 59% | 2644 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 44,150 psi | 68% | 2726 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 53,766 psi | 83% | 2917 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,634 psi | 81% | 2900 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 54,027 psi | 83% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,054 psi | 51% | 2500 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,575 psi | 78% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,132 psi | 62% | 2710 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 42% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,576 psi | 79% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,621 psi | 84% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,688 psi | 73% | 2749 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,038 psi | 77% | 2779 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 41,249 psi | 63% | 2651 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,047 psi | 65% | 2648 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 34,969 psi | 54% | 2549 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 50,212 psi | 77% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,272 psi | 80% | 2854 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 53,664 psi | 83% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,301 psi | 80% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,877 psi | 74% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,566 psi | 61% | 2598 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 37,710 psi | 58% | 2575 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 36,027 psi | 55% | 2569 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 52,243 psi | 80% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,910 psi | 81% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,312 psi | 74% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 88% | 46,833 psi | 72% | 2799 fps | 95.8% |
| Norma MRP | <<locked>> | 90% | 39,450 psi | 61% | 2743 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,216 psi | 56% | 2592 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 48,399 psi | 74% | 2812 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 47,848 psi | 74% | 2890 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 35,157 psi | 54% | 2572 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 42,438 psi | 65% | 2759 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 42% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,528 psi | 72% | 2743 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,765 psi | 81% | 2927 fps | 100% |
| ReloadSwiss RS 60 | 52.5 gr | 80% | 42,743 psi | 66% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,187 psi | 56% | 2615 fps | 97.1% |
| ReloadSwiss RS 70 | 53.3 gr | 80% | 35,128 psi | 54% | 2612 fps | 96.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,233 psi | 60% | 2762 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,777 psi | 77% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,279 psi | 67% | 2694 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 50,836 psi | 78% | 2841 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 44,483 psi | 68% | 2779 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 40,495 psi | 62% | 2615 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,566 psi | 61% | 2598 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,664 psi | 83% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,877 psi | 74% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,710 psi | 58% | 2575 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,396 psi | 68% | 2749 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,302 psi | 84% | 2864 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,822 psi | 80% | 2835 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,113 psi | 82% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,875 psi | 69% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,754 psi | 60% | 2543 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,063 psi | 68% | 2772 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,765 psi | 81% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,128 psi | 83% | 2854 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,743 psi | 67% | 2697 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 52,460 psi | 81% | 2835 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,735 psi | 50% | 2546 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 39,769 psi | 61% | 2651 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 53,664 psi | 83% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,024 psi | 77% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,053 psi | 77% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,640 psi | 64% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,710 psi | 58% | 2595 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 41,626 psi | 64% | 2680 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,501 psi | 75% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,231 psi | 57% | 2595 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 28,543 psi | 44% | 2431 fps | 95% |
| Vihtavuori N560 | <<locked>> | 98% | 52,359 psi | 81% | 2982 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,898 psi | 57% | 2566 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 38,406 psi | 59% | 2644 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,194 psi | 40% | 2434 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,837 psi | 80% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,933 psi | 69% | 2749 fps | 95.4% |
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 | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,107 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 | Prvi Partizan SP 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.