Load Specifications
Bullet:.284 | 127gr | Geco ZERO LG
Bullet Manufacturer:Geco
Bullet Weight:127 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:1:9.0
Load data in caliber .280 Ackley Improved with .284 | 127gr | Geco ZERO LG 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, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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>> | 86% | 58,581 psi | 90% | 2992 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,840 psi | 87% | 3015 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,130 psi | 88% | 3012 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,651 psi | 86% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,724 psi | 87% | 3012 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 56,985 psi | 88% | 3058 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,740 psi | 89% | 3153 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 58,030 psi | 89% | 3104 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,448 psi | 85% | 3041 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,913 psi | 88% | 3051 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,711 psi | 89% | 3022 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 58,740 psi | 90% | 3166 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 58,233 psi | 90% | 3232 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,361 psi | 85% | 3064 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,928 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,898 psi | 86% | 3087 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 3159 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,666 psi | 87% | 3196 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,146 psi | 60% | 2858 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,106 psi | 68% | 3028 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 58,131 psi | 89% | 3117 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 56,072 psi | 86% | 3081 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,159 psi | 86% | 3048 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,479 psi | 90% | 3028 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,449 psi | 87% | 3081 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,766 psi | 84% | 3127 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 57,566 psi | 89% | 3041 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,668 psi | 90% | 3068 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,232 psi | 88% | 3097 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 56,884 psi | 88% | 3150 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 57,667 psi | 89% | 3110 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 58,624 psi | 90% | 3114 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,387 psi | 79% | 3022 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,378 psi | 90% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 58,204 psi | 90% | 3192 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 54% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,289 psi | 87% | 3058 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,523 psi | 90% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,407 psi | 90% | 3081 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,363 psi | 90% | 3061 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 58,059 psi | 89% | 2953 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,710 psi | 87% | 3077 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,334 psi | 90% | 3087 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,375 psi | 84% | 3084 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 57,392 psi | 88% | 3120 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,913 psi | 88% | 3051 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,869 psi | 87% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,696 psi | 89% | 3071 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,464 psi | 88% | 3028 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 58,030 psi | 89% | 3074 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,508 psi | 88% | 3074 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3114 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 56,246 psi | 87% | 3038 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,043 psi | 88% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,100 psi | 85% | 3074 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 57,609 psi | 89% | 3130 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 56,710 psi | 87% | 3140 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 56,115 psi | 86% | 3104 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,506 psi | 85% | 3133 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 57,232 psi | 88% | 3068 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,855 psi | 87% | 3084 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,740 psi | 89% | 3048 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 55% | 1932 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,304 psi | 87% | 3028 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,609 psi | 89% | 3077 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,579 psi | 87% | 3159 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,478 psi | 87% | 3199 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3173 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,217 psi | 88% | 3209 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 57,159 psi | 88% | 3022 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,768 psi | 87% | 3035 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,927 psi | 86% | 3071 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,159 psi | 86% | 3048 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,508 psi | 88% | 3074 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,696 psi | 89% | 3071 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,030 psi | 89% | 3074 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3114 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 58,117 psi | 89% | 3140 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,796 psi | 86% | 3045 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,260 psi | 87% | 3064 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,870 psi | 89% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,508 psi | 90% | 2976 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 58,189 psi | 90% | 3031 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 58,436 psi | 90% | 3084 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,188 psi | 88% | 2972 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,274 psi | 85% | 3031 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,246 psi | 87% | 3071 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,966 psi | 78% | 3084 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,537 psi | 89% | 2936 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,146 psi | 89% | 2959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,826 psi | 87% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,899 psi | 89% | 3022 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,798 psi | 89% | 3048 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,492 psi | 85% | 3077 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 57,363 psi | 88% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,927 psi | 86% | 3015 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 3140 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,163 psi | 66% | 2943 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,086 psi | 86% | 3058 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,435 psi | 88% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,217 psi | 88% | 3153 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,998 psi | 54% | 2844 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,507 psi | 87% | 3081 fps | 100% |
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% | 48,385 psi | 74% | 2841 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,200 psi | 82% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,654 psi | 63% | 2749 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,312 psi | 74% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,748 psi | 77% | 2897 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,450 psi | 59% | 2740 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 34,983 psi | 54% | 2717 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,846 psi | 69% | 2871 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,043 psi | 59% | 2707 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,992 psi | 72% | 2884 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 47,166 psi | 73% | 2867 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 55,187 psi | 85% | 3107 fps | 100% |
| Alliant Power Pro 2000-MR | 50 gr | 80% | 40,756 psi | 63% | 2894 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,579 psi | 58% | 2730 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,462 psi | 84% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,480 psi | 62% | 2799 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,375 psi | 54% | 2736 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,503 psi | 50% | 2684 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,416 psi | 50% | 2680 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,130 psi | 59% | 2884 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,077 psi | 68% | 2871 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 37,173 psi | 57% | 2730 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 49,443 psi | 76% | 2930 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,486 psi | 75% | 2871 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,716 psi | 70% | 2900 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,879 psi | 78% | 3061 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 53,751 psi | 83% | 2989 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 54,955 psi | 85% | 3015 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,087 psi | 59% | 2733 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 46,398 psi | 71% | 2959 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 50,546 psi | 78% | 2989 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,266 psi | 70% | 2884 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,240 psi | 47% | 2562 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,365 psi | 64% | 2851 fps | 99% |
| Hodgdon Superformance | <<locked>> | 92% | 46,615 psi | 72% | 2986 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,165 psi | 40% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,366 psi | 67% | 2831 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 44,933 psi | 69% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,929 psi | 61% | 2746 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,266 psi | 70% | 2828 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 54,563 psi | 84% | 2904 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 49,719 psi | 76% | 2959 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,266 psi | 70% | 2854 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 36,274 psi | 56% | 2730 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,481 psi | 64% | 2831 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 46,992 psi | 72% | 2884 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 53,200 psi | 82% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,903 psi | 68% | 2848 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,802 psi | 69% | 2808 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 39,740 psi | 61% | 2749 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 39,421 psi | 61% | 2736 fps | 95% |
| Lovex S070 | <<locked>> | 92% | 45,252 psi | 70% | 2881 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,540 psi | 67% | 2818 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 44,121 psi | 68% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,856 psi | 61% | 2785 fps | 97.9% |
| Norma 204 | <<locked>> | 98% | 53,751 psi | 83% | 3068 fps | 95.2% |
| Norma URP | <<locked>> | 86% | 35,346 psi | 54% | 2720 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,421 psi | 61% | 2795 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 42,467 psi | 65% | 2887 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 46,775 psi | 72% | 2884 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,514 psi | 72% | 2907 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,604 psi | 78% | 2933 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,455 psi | 41% | 1726 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,678 psi | 81% | 2972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,106 psi | 68% | 2838 fps | 95.6% |
| ReloadSwiss RS 52 | 48.5 gr | 80% | 42,743 psi | 66% | 2910 fps | 98% |
| ReloadSwiss RS 60 | 49.3 gr | 80% | 34,650 psi | 53% | 2759 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,420 psi | 58% | 2795 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,379 psi | 62% | 2874 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,442 psi | 73% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,539 psi | 64% | 2769 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,737 psi | 53% | 2664 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 49,443 psi | 76% | 2930 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,421 psi | 61% | 2736 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,903 psi | 68% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,740 psi | 61% | 2749 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 45,252 psi | 70% | 2881 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,071 psi | 55% | 2723 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,150 psi | 69% | 2858 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,337 psi | 67% | 2838 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,078 psi | 69% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,478 psi | 58% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,427 psi | 73% | 2851 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 50,778 psi | 78% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,570 psi | 69% | 2776 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,831 psi | 69% | 2854 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,665 psi | 55% | 2674 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 27,601 psi | 42% | 2539 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,952 psi | 78% | 2844 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,484 psi | 70% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,046 psi | 63% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,640 psi | 64% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,939 psi | 52% | 2608 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 37,115 psi | 57% | 2726 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,079 psi | 72% | 2881 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,263 psi | 62% | 2746 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,506 psi | 56% | 2723 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 35,041 psi | 54% | 2762 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,168 psi | 46% | 2520 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 46,934 psi | 72% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 46,659 psi | 72% | 2966 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,661 psi | 47% | 2700 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,815 psi | 66% | 2838 fps | 98.9% |
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 | 127gr | Geco ZERO LG. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,232 fps. Accurate 4350 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 54–90 %, leaving at least 10 % headroom. The 127.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .280 Ackley Improved with the .284 | 127gr | Geco ZERO LG 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.