Load Specifications
Bullet:.284 | 140gr | Speer TBBC
Bullet Manufacturer:Speer
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:1:12.0
Load data in caliber .280 Ackley Improved with .284 | 140gr | Speer TBBC bullet and 105 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% | 55,709 psi | 86% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,305 psi | 88% | 2923 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,633 psi | 78% | 2897 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 55,985 psi | 86% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,463 psi | 87% | 3012 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 58,624 psi | 90% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,260 psi | 87% | 2940 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 3051 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,392 psi | 88% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,332 psi | 85% | 3064 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,740 psi | 89% | 3048 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,913 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,406 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,145 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,911 psi | 84% | 3045 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,869 psi | 87% | 3038 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,459 psi | 78% | 2976 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,355 psi | 73% | 2917 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,437 psi | 64% | 2822 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,259 psi | 83% | 3110 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,201 psi | 85% | 2956 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 57,914 psi | 89% | 2982 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,459 psi | 78% | 2976 fps | 96.7% |
| Bofors RP7 | <<locked>> | 92% | 57,188 psi | 88% | 2959 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,566 psi | 90% | 2910 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,363 psi | 88% | 2966 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,450 psi | 90% | 3002 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,259 psi | 85% | 3009 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 92% | 58,740 psi | 90% | 3022 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 82% | 55,825 psi | 86% | 2949 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,377 psi | 88% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,028 psi | 86% | 2986 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,419 psi | 85% | 3045 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,956 psi | 88% | 2949 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,463 psi | 87% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,782 psi | 86% | 2923 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,711 psi | 90% | 2963 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 58,233 psi | 90% | 2995 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,579 psi | 86% | 2940 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 56,956 psi | 88% | 3002 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,085 psi | 85% | 2963 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,087 psi | 88% | 2976 fps | 96% |
| IMR 8208 XBR | <<locked>> | 82% | 57,392 psi | 88% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,376 psi | 85% | 2910 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,464 psi | 88% | 2910 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,869 psi | 86% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,550 psi | 85% | 2936 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 56,623 psi | 87% | 2972 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,945 psi | 65% | 2740 fps | 97% |
| Norma 201 | <<locked>> | 84% | 57,392 psi | 88% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,131 psi | 89% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,623 psi | 87% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,434 psi | 85% | 2992 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,447 psi | 82% | 3064 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 55,230 psi | 85% | 2995 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,537 psi | 89% | 3002 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,609 psi | 89% | 3048 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 57,609 psi | 89% | 2963 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,725 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 57% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,378 psi | 90% | 2982 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,320 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,392 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,318 psi | 87% | 3035 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,201 psi | 85% | 3064 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 58,015 psi | 89% | 2907 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,131 psi | 89% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,073 psi | 89% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,898 psi | 86% | 2966 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,970 psi | 86% | 3022 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 92% | 57,188 psi | 88% | 2959 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,550 psi | 85% | 2936 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,376 psi | 85% | 2910 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,869 psi | 86% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,623 psi | 87% | 2972 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,883 psi | 86% | 2986 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,405 psi | 87% | 2940 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,101 psi | 88% | 2959 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,334 psi | 90% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,521 psi | 85% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,230 psi | 85% | 2884 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,463 psi | 85% | 3015 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 57,928 psi | 89% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,173 psi | 86% | 2930 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,682 psi | 89% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 57,827 psi | 89% | 2956 fps | 95.8% |
| Somchem S365 | <<locked>> | 98% | 57,972 psi | 89% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,855 psi | 87% | 2999 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 58,769 psi | 90% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,334 psi | 90% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,740 psi | 90% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,825 psi | 86% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,392 psi | 88% | 2989 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,950 psi | 75% | 2854 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 82% | 57,783 psi | 89% | 2933 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,739 psi | 87% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,594 psi | 87% | 2995 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2999 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,450 psi | 88% | 2959 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,711 psi | 90% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,506 psi | 85% | 3012 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,757 psi | 66% | 2959 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,450 psi | 88% | 2972 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2933 fps | 96.9% |
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% | 49,037 psi | 75% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,021 psi | 72% | 2749 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 35,984 psi | 55% | 2608 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,441 psi | 71% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,838 psi | 54% | 2598 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 80% | 51,706 psi | 80% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,034 psi | 68% | 2730 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 47,398 psi | 73% | 2871 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,751 psi | 83% | 2881 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,167 psi | 74% | 2943 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,326 psi | 73% | 2871 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,208 psi | 68% | 2756 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,224 psi | 73% | 2822 fps | 99.6% |
| Alliant Reloder-16 | 48.4 gr | 80% | 34,330 psi | 53% | 2612 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,798 psi | 60% | 2743 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,717 psi | 72% | 2861 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 47,079 psi | 72% | 2913 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,514 psi | 44% | 2467 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,637 psi | 56% | 2703 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,793 psi | 50% | 2644 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,445 psi | 79% | 2894 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,498 psi | 68% | 2766 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 47,079 psi | 72% | 2913 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 41,858 psi | 64% | 2680 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,187 psi | 85% | 2861 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,722 psi | 83% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,860 psi | 69% | 2772 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 39,523 psi | 61% | 2707 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 45,542 psi | 70% | 2792 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 52,243 psi | 80% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,850 psi | 49% | 2507 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,994 psi | 75% | 2874 fps | 100% |
| Hodgdon Superformance | 57.9 gr | 84% | 41,510 psi | 64% | 2779 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 42% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,125 psi | 77% | 2841 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,939 psi | 81% | 2877 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,296 psi | 71% | 2766 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,501 psi | 75% | 2789 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 42,540 psi | 65% | 2717 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,654 psi | 63% | 2657 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 33,692 psi | 52% | 2556 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 48,443 psi | 75% | 2851 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,751 psi | 83% | 2920 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 53,751 psi | 83% | 2881 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,025 psi | 80% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,966 psi | 78% | 2812 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,441 psi | 71% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,377 psi | 59% | 2608 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 38,841 psi | 60% | 2638 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 36,782 psi | 57% | 2628 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 50,792 psi | 78% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,155 psi | 79% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,601 psi | 72% | 2808 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,327 psi | 74% | 2867 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 40,538 psi | 62% | 2805 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,925 psi | 54% | 2598 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 46,876 psi | 72% | 2831 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 38,653 psi | 59% | 2697 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 53,809 psi | 83% | 2900 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,795 psi | 83% | 2917 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,499 psi | 42% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,918 psi | 69% | 2753 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,995 psi | 78% | 2943 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,263 psi | 63% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,606 psi | 53% | 2615 fps | 96.1% |
| ReloadSwiss RS 70 | 53 gr | 80% | 33,982 psi | 52% | 2615 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 54,897 psi | 84% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,370 psi | 74% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,829 psi | 64% | 2707 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,272 psi | 80% | 2904 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 45,788 psi | 70% | 2844 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,858 psi | 64% | 2680 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,377 psi | 59% | 2608 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,025 psi | 80% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,441 psi | 71% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,841 psi | 60% | 2638 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,975 psi | 66% | 2762 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,808 psi | 81% | 2887 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,372 psi | 77% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,445 psi | 79% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,337 psi | 67% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,030 psi | 62% | 2605 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,368 psi | 70% | 2838 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 51,416 psi | 79% | 2766 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,301 psi | 80% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,380 psi | 65% | 2713 fps | 99.6% |
| Somchem S361 | <<locked>> | 96% | 54,186 psi | 83% | 2900 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 31,459 psi | 48% | 2552 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 43,555 psi | 67% | 2769 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 51,953 psi | 80% | 2749 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,225 psi | 74% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,588 psi | 75% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,306 psi | 62% | 2638 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,216 psi | 56% | 2598 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 42,859 psi | 66% | 2743 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 54,259 psi | 83% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,891 psi | 72% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,766 psi | 55% | 2598 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 31,212 psi | 48% | 2546 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,607 psi | 55% | 2572 fps | 98.7% |
| Winchester 748 | <<locked>> | 80% | 54,868 psi | 84% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 39,740 psi | 61% | 2713 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,876 psi | 41% | 2487 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,053 psi | 77% | 2858 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,412 psi | 71% | 2815 fps | 95.3% |
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 105 powders for .280 Ackley Improved loaded with the .284 | 140gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,110 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 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 1:12.0 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 | Speer TBBC 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.