Load Specifications
Bullet Manufacturer:North Fork
Bullet Weight:130 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 | 130gr | NorthFork Bonded Core bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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% | 56,623 psi | 87% | 2940 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,014 psi | 86% | 2966 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,566 psi | 89% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,117 psi | 89% | 3025 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,065 psi | 72% | 2923 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 56,420 psi | 87% | 3022 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,666 psi | 87% | 3114 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 56,014 psi | 86% | 3051 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,116 psi | 88% | 3054 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,549 psi | 84% | 3091 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,305 psi | 90% | 3051 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,202 psi | 86% | 2972 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,014 psi | 86% | 3179 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,230 psi | 83% | 3084 fps | 96.4% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,230 psi | 83% | 3084 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,537 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,059 psi | 89% | 3104 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,508 psi | 88% | 3176 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,100 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,417 psi | 82% | 3074 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,454 psi | 68% | 2956 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,502 psi | 78% | 3143 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,738 psi | 86% | 3064 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 58,465 psi | 90% | 3094 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,957 psi | 89% | 3064 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,970 psi | 86% | 2976 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,276 psi | 90% | 3081 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,230 psi | 85% | 3051 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 55,506 psi | 85% | 3110 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 55,854 psi | 86% | 3071 fps | 97% |
| Hodgdon H4895 | <<locked>> | 84% | 56,594 psi | 87% | 3064 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,711 psi | 89% | 3097 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,507 psi | 87% | 3097 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,927 psi | 86% | 3146 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 55% | 1900 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,537 psi | 89% | 3061 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,840 psi | 87% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,347 psi | 87% | 3031 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,941 psi | 86% | 3012 fps | 98.1% |
| IMR 4350 | <<locked>> | 98% | 58,508 psi | 90% | 3091 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,376 psi | 87% | 3045 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 57,217 psi | 88% | 3107 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 55,738 psi | 86% | 3074 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,305 psi | 90% | 3051 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,231 psi | 87% | 3025 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,552 psi | 90% | 3028 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,623 psi | 87% | 3031 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,912 psi | 86% | 3035 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 57,188 psi | 88% | 3074 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 57,972 psi | 89% | 3045 fps | 100% |
| Norma 202 | <<locked>> | 86% | 58,682 psi | 90% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,276 psi | 88% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,898 psi | 86% | 3091 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 49,806 psi | 77% | 3091 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 55,521 psi | 85% | 3100 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 57,986 psi | 89% | 3110 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,146 psi | 89% | 3156 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 58,711 psi | 90% | 3077 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 58,378 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 56% | 1942 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,593 psi | 86% | 3035 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,129 psi | 85% | 3114 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 58,639 psi | 90% | 3205 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,608 psi | 87% | 3140 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,463 psi | 85% | 3163 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,564 psi | 85% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 58,755 psi | 90% | 3045 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,247 psi | 90% | 3084 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,359 psi | 81% | 3054 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 94% | 57,957 psi | 89% | 3064 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,912 psi | 86% | 3035 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,231 psi | 87% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,623 psi | 87% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,188 psi | 88% | 3074 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,304 psi | 87% | 3091 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,392 psi | 88% | 3054 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,102 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,666 psi | 86% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,478 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,014 psi | 86% | 2986 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,866 psi | 80% | 3048 fps | 96% |
| Somchem S335 | <<locked>> | 86% | 58,610 psi | 90% | 2969 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,811 psi | 87% | 3038 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 58,320 psi | 90% | 3081 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 3159 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,258 psi | 82% | 3035 fps | 97.2% |
| Vihtavuori N130 | <<locked>> | 82% | 58,581 psi | 90% | 2930 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 56,057 psi | 86% | 2910 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,230 psi | 85% | 2956 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,738 psi | 86% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,159 psi | 86% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,827 psi | 89% | 3094 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 58,726 psi | 90% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,464 psi | 88% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,869 psi | 87% | 3100 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,429 psi | 76% | 3035 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,131 psi | 89% | 3068 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,506 psi | 85% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,811 psi | 86% | 3114 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,059 psi | 62% | 2982 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,073 psi | 89% | 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% | 53,185 psi | 82% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,209 psi | 71% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,795 psi | 83% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,718 psi | 73% | 2848 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 40,959 psi | 63% | 2805 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 43,729 psi | 67% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,882 psi | 54% | 2687 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,313 psi | 76% | 2940 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,800 psi | 64% | 2776 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 50,937 psi | 78% | 3025 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,372 psi | 79% | 2943 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,634 psi | 81% | 2923 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,295 psi | 70% | 2979 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,937 psi | 78% | 3025 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,937 psi | 78% | 3025 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,959 psi | 65% | 2805 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,889 psi | 69% | 2871 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 34,635 psi | 53% | 2700 fps | 95.7% |
| Alliant Reloder-17 | 52.2 gr | 80% | 36,405 psi | 56% | 2776 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,212 psi | 77% | 3015 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,385 psi | 47% | 2602 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,186 psi | 54% | 2792 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,892 psi | 75% | 2946 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 41,843 psi | 64% | 2808 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 45,063 psi | 69% | 2835 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,707 psi | 81% | 2923 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,792 psi | 78% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,569 psi | 65% | 2815 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 42,511 psi | 65% | 2861 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 49,168 psi | 76% | 2949 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 49,806 psi | 77% | 2949 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,037 psi | 46% | 2539 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,108 psi | 71% | 2923 fps | 99.8% |
| Hodgdon Superformance | 60.7 gr | 88% | 45,078 psi | 69% | 2943 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 41% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,616 psi | 73% | 2897 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 49,937 psi | 77% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,932 psi | 68% | 2812 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,427 psi | 71% | 2838 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 45,614 psi | 70% | 2864 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,830 psi | 67% | 2812 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 33,765 psi | 52% | 2644 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 46,035 psi | 71% | 2904 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 51,372 psi | 79% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,037 psi | 75% | 2913 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,631 psi | 75% | 2864 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,990 psi | 68% | 2815 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 38,609 psi | 59% | 2700 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 41,669 psi | 64% | 2789 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,211 psi | 74% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,762 psi | 75% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,266 psi | 68% | 2858 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 52,141 psi | 80% | 3028 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 43,395 psi | 67% | 2956 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 35,070 psi | 54% | 2690 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 44,092 psi | 68% | 2874 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 39,015 psi | 60% | 2792 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,401 psi | 79% | 2956 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,227 psi | 79% | 2976 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 42% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,757 psi | 66% | 2795 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,892 psi | 74% | 2989 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,711 psi | 60% | 2841 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,722 psi | 53% | 2707 fps | 95.2% |
| ReloadSwiss RS 70 | 55.7 gr | 84% | 36,767 psi | 57% | 2769 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 52,315 psi | 80% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,919 psi | 71% | 2835 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,320 psi | 60% | 2746 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 49,037 psi | 75% | 2995 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 45,063 psi | 69% | 2835 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,609 psi | 59% | 2700 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,037 psi | 75% | 2913 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,990 psi | 68% | 2815 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 41,669 psi | 64% | 2789 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,393 psi | 62% | 2802 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,951 psi | 77% | 2930 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,761 psi | 73% | 2904 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,298 psi | 76% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,365 psi | 64% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,149 psi | 66% | 2756 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,573 psi | 75% | 2989 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,994 psi | 75% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,792 psi | 77% | 2927 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,001 psi | 62% | 2753 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 29,385 psi | 45% | 2575 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 46,717 psi | 72% | 2917 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 55,405 psi | 85% | 2887 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 49,748 psi | 77% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,818 psi | 70% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,064 psi | 71% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,043 psi | 59% | 2684 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 34,142 psi | 53% | 2635 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 51,547 psi | 79% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,657 psi | 69% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,940 psi | 55% | 2690 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 33,156 psi | 51% | 2684 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,765 psi | 52% | 2608 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 51,851 psi | 80% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,743 psi | 66% | 2867 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,660 psi | 44% | 2621 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,572 psi | 73% | 2910 fps | 99.8% |
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 101 powders for .280 Ackley Improved loaded with the .284 | 130gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,205 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 130.0 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 130gr | NorthFork Bonded Core 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.