Load Specifications
Bullet Manufacturer:Rhino Bullets
Bullet Weight:140 gr
Bullet Diameter:0.283"
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:1:10.5
Load data in caliber .280 Ackley Improved with .283 | 140gr | Rhino Penetrator 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 60, Hodgdon H414 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 2015 | <<locked>> | 82% | 57,899 psi | 89% | 2844 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,841 psi | 89% | 2881 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,956 psi | 86% | 2890 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,805 psi | 75% | 2858 fps | 98.3% |
| Accurate 4064 | <<locked>> | 88% | 58,044 psi | 89% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,755 psi | 90% | 3038 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,276 psi | 88% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,291 psi | 90% | 2963 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 3012 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,014 psi | 86% | 2907 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,740 psi | 89% | 2877 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,653 psi | 89% | 3094 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,593 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,782 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,376 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,072 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3002 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,515 psi | 75% | 2933 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,919 psi | 71% | 2884 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,059 psi | 62% | 2779 fps | 96.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,228 psi | 80% | 3071 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,421 psi | 88% | 2982 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,304 psi | 87% | 2953 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,515 psi | 75% | 2933 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 55,825 psi | 86% | 2930 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,246 psi | 88% | 2884 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,811 psi | 86% | 2936 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,985 psi | 88% | 2969 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 57,130 psi | 88% | 3028 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 57,130 psi | 88% | 2989 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 57,914 psi | 89% | 2969 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,593 psi | 86% | 2956 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,001 psi | 89% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,653 psi | 89% | 3071 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 56% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,361 psi | 85% | 2920 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,523 psi | 90% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,030 psi | 89% | 2949 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,290 psi | 88% | 2927 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,420 psi | 87% | 2956 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,682 psi | 89% | 2963 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 55,201 psi | 85% | 2969 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 57,217 psi | 88% | 2989 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,014 psi | 86% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,508 psi | 88% | 2933 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,217 psi | 86% | 2884 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,059 psi | 89% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,363 psi | 88% | 2953 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 58,595 psi | 90% | 2992 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,437 psi | 62% | 2703 fps | 96.4% |
| Norma 201 | <<locked>> | 84% | 55,999 psi | 86% | 2904 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,724 psi | 87% | 2904 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,581 psi | 90% | 2995 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,551 psi | 89% | 3015 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 51,488 psi | 79% | 3022 fps | 98% |
| Norma URP | <<locked>> | 96% | 57,043 psi | 88% | 3018 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,796 psi | 86% | 2969 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,043 psi | 86% | 3018 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 56,246 psi | 87% | 2933 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,188 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,000 psi | 88% | 2953 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,811 psi | 87% | 3028 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,521 psi | 87% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,291 psi | 90% | 3058 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,029 psi | 88% | 3087 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,782 psi | 87% | 2881 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,492 psi | 87% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,115 psi | 86% | 2946 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,769 psi | 89% | 2982 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,056 psi | 83% | 2982 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 55,825 psi | 86% | 2930 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,363 psi | 88% | 2953 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,508 psi | 88% | 2933 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,059 psi | 89% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,595 psi | 90% | 2992 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,928 psi | 89% | 3009 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,897 psi | 84% | 2910 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,869 psi | 86% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,927 psi | 88% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,841 psi | 89% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,595 psi | 89% | 2910 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,563 psi | 82% | 2979 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 56,608 psi | 87% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,508 psi | 90% | 2956 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,159 psi | 86% | 2940 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,811 psi | 86% | 3018 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2959 fps | 98% |
| Vihtavuori N133 | <<locked>> | 84% | 57,319 psi | 88% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,811 psi | 87% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,072 psi | 88% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,638 psi | 89% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,666 psi | 86% | 2956 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,326 psi | 73% | 2818 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 56,420 psi | 87% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,303 psi | 85% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,523 psi | 90% | 3018 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,198 psi | 79% | 2963 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,753 psi | 86% | 2930 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,029 psi | 88% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,392 psi | 88% | 3035 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,379 psi | 64% | 2923 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,927 psi | 86% | 2940 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2897 fps | 96.4% |
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 2015 | <<locked>> | 80% | 54,607 psi | 84% | 2802 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,485 psi | 73% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,919 psi | 71% | 2717 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 36,941 psi | 57% | 2625 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 44,933 psi | 69% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,765 psi | 52% | 2569 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 50,575 psi | 78% | 2854 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 43,018 psi | 66% | 2703 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 49,052 psi | 75% | 2890 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,620 psi | 81% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,983 psi | 83% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,659 psi | 72% | 2907 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,105 psi | 66% | 2726 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,166 psi | 71% | 2795 fps | 99.5% |
| Alliant Reloder-16 | 47.1 gr | 80% | 33,402 psi | 51% | 2579 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,492 psi | 58% | 2707 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,515 psi | 75% | 2884 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,469 psi | 70% | 2874 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,443 psi | 45% | 2490 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,623 psi | 58% | 2720 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,895 psi | 52% | 2671 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,227 psi | 77% | 2867 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 43,105 psi | 66% | 2733 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,469 psi | 70% | 2874 fps | 95.1% |
| Bofors RP7 | <<locked>> | 84% | 43,584 psi | 67% | 2710 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,853 psi | 83% | 2835 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,127 psi | 80% | 2881 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,613 psi | 67% | 2740 fps | 98.3% |
| Hodgdon H414 | 52.1 gr | 84% | 40,959 psi | 63% | 2733 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 44,425 psi | 68% | 2759 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 51,097 psi | 79% | 2864 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,922 psi | 48% | 2477 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,369 psi | 73% | 2841 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,323 psi | 67% | 2812 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 41% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,791 psi | 75% | 2812 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,503 psi | 79% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,208 psi | 70% | 2736 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,572 psi | 73% | 2762 fps | 97.2% |
| IMR 4350 | <<locked>> | 88% | 43,932 psi | 68% | 2736 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,322 psi | 65% | 2684 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 32,706 psi | 50% | 2526 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 47,311 psi | 73% | 2825 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,620 psi | 81% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,589 psi | 78% | 2831 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,937 psi | 77% | 2785 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,353 psi | 70% | 2740 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,246 psi | 57% | 2575 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 40,219 psi | 62% | 2661 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 37,797 psi | 58% | 2644 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 49,356 psi | 76% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,009 psi | 77% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,527 psi | 70% | 2782 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 46,818 psi | 72% | 2831 fps | 95% |
| Norma MRP | <<locked>> | 94% | 41,829 psi | 64% | 2828 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 33,910 psi | 52% | 2569 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 45,411 psi | 70% | 2799 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,623 psi | 58% | 2667 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 52,678 psi | 81% | 2874 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,547 psi | 81% | 2890 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 42% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,801 psi | 67% | 2720 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,501 psi | 76% | 2910 fps | 99.7% |
| ReloadSwiss RS 60 | 50.7 gr | 80% | 39,856 psi | 61% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,431 psi | 51% | 2582 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 35,259 psi | 54% | 2644 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 53,650 psi | 83% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,978 psi | 72% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,698 psi | 63% | 2680 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 54,157 psi | 83% | 2927 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 96% | 47,340 psi | 73% | 2867 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 43,584 psi | 67% | 2710 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,246 psi | 57% | 2575 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,589 psi | 78% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,353 psi | 70% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,219 psi | 62% | 2661 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,742 psi | 64% | 2730 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,285 psi | 79% | 2851 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,110 psi | 76% | 2825 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,546 psi | 78% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,511 psi | 65% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,553 psi | 64% | 2631 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,905 psi | 72% | 2861 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,067 psi | 77% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,140 psi | 79% | 2844 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 41,075 psi | 63% | 2677 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 30,356 psi | 47% | 2520 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 42,105 psi | 65% | 2730 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 51,039 psi | 79% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,152 psi | 73% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,500 psi | 73% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,320 psi | 60% | 2615 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,230 psi | 54% | 2572 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 44,353 psi | 68% | 2762 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,895 psi | 81% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,658 psi | 70% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,650 psi | 53% | 2566 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 30,052 psi | 46% | 2510 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,722 psi | 53% | 2543 fps | 98.4% |
| Winchester 748 | <<locked>> | 80% | 53,200 psi | 82% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,176 psi | 63% | 2740 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,833 psi | 43% | 2516 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,834 psi | 75% | 2831 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,935 psi | 74% | 2835 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 118 powders for .280 Ackley Improved loaded with the .283 | 140gr | Rhino Penetrator. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,094 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 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 0.283" calls for a 1:10.5 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 60, Hodgdon H414, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .283 | 140gr | Rhino Penetrator they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.