Load Specifications
Bullet Manufacturer:Sellier & Bellot
Bullet Weight:140 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 | 140gr | Sellier & Bellot FMJ 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 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% | 55,956 psi | 86% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,450 psi | 88% | 2927 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,792 psi | 78% | 2900 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 56,202 psi | 86% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,985 psi | 88% | 3022 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,405 psi | 85% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,449 psi | 87% | 2946 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,059 psi | 89% | 3058 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,595 psi | 89% | 2940 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,506 psi | 85% | 3068 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,870 psi | 89% | 3051 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,101 psi | 88% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,609 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,624 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,100 psi | 85% | 3048 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3041 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,589 psi | 78% | 2979 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,761 psi | 73% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,771 psi | 64% | 2831 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,708 psi | 84% | 3117 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,376 psi | 85% | 2959 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 58,102 psi | 89% | 2989 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,589 psi | 78% | 2979 fps | 96.7% |
| Bofors RP7 | <<locked>> | 92% | 57,653 psi | 89% | 2969 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,769 psi | 90% | 2917 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,609 psi | 89% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,639 psi | 90% | 3005 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,405 psi | 85% | 3012 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 55,463 psi | 85% | 2972 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 56,028 psi | 86% | 2953 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,856 psi | 89% | 2995 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,260 psi | 87% | 2989 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,811 psi | 86% | 3051 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 56% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,159 psi | 88% | 2956 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,666 psi | 87% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,985 psi | 86% | 2930 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,201 psi | 85% | 2907 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 58,392 psi | 90% | 2999 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,738 psi | 86% | 2943 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 57,130 psi | 88% | 3005 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,288 psi | 85% | 2969 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,508 psi | 88% | 2982 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 82% | 57,595 psi | 89% | 2940 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,593 psi | 86% | 2913 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,667 psi | 89% | 2917 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,072 psi | 86% | 2923 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,767 psi | 86% | 2940 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 56,826 psi | 87% | 2979 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,119 psi | 65% | 2743 fps | 97.1% |
| Norma 201 | <<locked>> | 84% | 57,609 psi | 89% | 2936 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,349 psi | 90% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,826 psi | 87% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,608 psi | 86% | 2995 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,592 psi | 82% | 3068 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 55,405 psi | 85% | 2999 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,754 psi | 89% | 3009 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 58,117 psi | 89% | 3058 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 57,769 psi | 89% | 2966 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,899 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,523 psi | 90% | 2986 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,508 psi | 90% | 3064 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,624 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,782 psi | 87% | 3041 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,332 psi | 85% | 3068 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,276 psi | 90% | 2910 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,349 psi | 90% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,262 psi | 90% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,072 psi | 86% | 2969 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 3028 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 92% | 57,653 psi | 89% | 2969 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,767 psi | 86% | 2940 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,593 psi | 86% | 2913 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,072 psi | 86% | 2923 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,826 psi | 87% | 2979 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,043 psi | 86% | 2989 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,565 psi | 87% | 2946 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,290 psi | 88% | 2966 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,566 psi | 90% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,709 psi | 86% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,419 psi | 85% | 2887 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,651 psi | 86% | 3022 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 58,131 psi | 89% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,347 psi | 87% | 2933 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,189 psi | 90% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,247 psi | 90% | 2966 fps | 96% |
| Somchem S365 | <<locked>> | 98% | 58,160 psi | 89% | 3054 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,971 psi | 88% | 3002 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 55,492 psi | 85% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,581 psi | 90% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,434 psi | 85% | 2864 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,999 psi | 86% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,856 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,110 psi | 76% | 2861 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 82% | 58,001 psi | 89% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,942 psi | 88% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,710 psi | 87% | 3002 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,403 psi | 82% | 3002 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,595 psi | 89% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,709 psi | 86% | 3015 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,902 psi | 66% | 2966 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,653 psi | 89% | 2976 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2936 fps | 97% |
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% | 49,023 psi | 75% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,195 psi | 73% | 2753 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 36,129 psi | 56% | 2612 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,427 psi | 71% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,027 psi | 54% | 2605 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 80% | 51,866 psi | 80% | 2887 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,237 psi | 68% | 2736 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 47,529 psi | 73% | 2874 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,969 psi | 83% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,370 psi | 74% | 2946 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,718 psi | 73% | 2877 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,425 psi | 68% | 2759 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,442 psi | 73% | 2828 fps | 99.7% |
| Alliant Reloder-16 | 48.6 gr | 80% | 34,476 psi | 53% | 2615 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,972 psi | 60% | 2749 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,108 psi | 72% | 2867 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,324 psi | 68% | 2858 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,631 psi | 44% | 2474 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,767 psi | 57% | 2707 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,909 psi | 51% | 2651 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,619 psi | 79% | 2900 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,686 psi | 69% | 2772 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 44,324 psi | 68% | 2858 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 41,989 psi | 65% | 2684 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,405 psi | 85% | 2867 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,911 psi | 83% | 2917 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,063 psi | 69% | 2776 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 39,697 psi | 61% | 2713 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 45,701 psi | 70% | 2799 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 52,460 psi | 81% | 2897 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,039 psi | 49% | 2513 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,197 psi | 76% | 2877 fps | 100% |
| Hodgdon Superformance | 58.1 gr | 84% | 41,655 psi | 64% | 2785 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 41% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,328 psi | 77% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,881 psi | 81% | 2877 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,514 psi | 72% | 2772 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,689 psi | 75% | 2795 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 42,699 psi | 66% | 2720 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,828 psi | 63% | 2661 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 33,837 psi | 52% | 2559 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 48,675 psi | 75% | 2858 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,853 psi | 83% | 2923 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 53,969 psi | 83% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,243 psi | 80% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,184 psi | 79% | 2815 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,673 psi | 72% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,334 psi | 59% | 2612 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 39,015 psi | 60% | 2644 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 37,115 psi | 57% | 2635 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,734 psi | 78% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,358 psi | 79% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,818 psi | 72% | 2812 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,486 psi | 75% | 2874 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 40,669 psi | 63% | 2812 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,114 psi | 54% | 2605 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 47,050 psi | 72% | 2835 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,303 psi | 56% | 2641 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 53,983 psi | 83% | 2907 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,998 psi | 83% | 2923 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,092 psi | 69% | 2756 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,227 psi | 79% | 2949 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,437 psi | 64% | 2812 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,722 psi | 53% | 2618 fps | 96.1% |
| ReloadSwiss RS 70 | 53.2 gr | 80% | 34,113 psi | 52% | 2621 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 54,839 psi | 84% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,356 psi | 74% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,018 psi | 65% | 2713 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,678 psi | 81% | 2913 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 94% | 45,992 psi | 71% | 2848 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,989 psi | 65% | 2684 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,334 psi | 59% | 2612 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,243 psi | 80% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,673 psi | 72% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,015 psi | 60% | 2644 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,163 psi | 66% | 2766 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,982 psi | 82% | 2890 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,560 psi | 78% | 2858 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,692 psi | 80% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,569 psi | 67% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,190 psi | 62% | 2612 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,556 psi | 70% | 2844 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,343 psi | 79% | 2766 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,489 psi | 81% | 2874 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,351 psi | 65% | 2710 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,273 psi | 83% | 2904 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 31,633 psi | 49% | 2559 fps | 98.6% |
| Somchem S385 | <<locked>> | 90% | 41,046 psi | 63% | 2717 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,199 psi | 80% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,443 psi | 75% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,805 psi | 75% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,509 psi | 62% | 2644 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,376 psi | 56% | 2605 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 42,989 psi | 66% | 2746 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 54,476 psi | 84% | 2887 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,065 psi | 72% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,940 psi | 55% | 2605 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 31,401 psi | 48% | 2552 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,737 psi | 55% | 2575 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 39,914 psi | 61% | 2717 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,963 psi | 41% | 2493 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,256 psi | 77% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,528 psi | 72% | 2818 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 104 powders for .280 Ackley Improved loaded with the .284 | 140gr | Sellier & Bellot FMJ. Alliant Reloder-26 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,117 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 | 140gr | Sellier & Bellot FMJ 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.