Load Specifications
Bullet:.284 | 128gr | IBEX TRD
Bullet Manufacturer:IBEX
Bullet Weight:128 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:1:11.0
Load data in caliber .280 Ackley Improved with .284 | 128gr | IBEX TRD bullet and 100 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-17 and ReloadSwiss RS 60.
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.
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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% | 57,566 psi | 89% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,943 psi | 89% | 2995 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,755 psi | 90% | 3061 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,419 psi | 85% | 2986 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,530 psi | 75% | 2956 fps | 97.5% |
| Accurate 4064 | <<locked>> | 88% | 57,885 psi | 89% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,856 psi | 89% | 3140 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 56,826 psi | 87% | 3071 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,537 psi | 89% | 3068 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,955 psi | 85% | 3100 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,317 psi | 85% | 3012 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,927 psi | 88% | 2989 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,449 psi | 87% | 3196 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,998 psi | 85% | 3100 fps | 96.2% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,998 psi | 85% | 3100 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,160 psi | 89% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,697 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,986 psi | 89% | 3189 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,738 psi | 86% | 3169 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,157 psi | 83% | 3091 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,194 psi | 70% | 2976 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,372 psi | 79% | 3163 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,536 psi | 87% | 3081 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 55,912 psi | 86% | 3061 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 58,711 psi | 90% | 3081 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,840 psi | 87% | 2995 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,303 psi | 85% | 3045 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,391 psi | 87% | 3071 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 56,202 psi | 86% | 3127 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 56,376 psi | 87% | 3084 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 57,406 psi | 88% | 3081 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 58,305 psi | 90% | 3110 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,043 psi | 88% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,463 psi | 87% | 3159 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,071 psi | 55% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,189 psi | 90% | 3077 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,580 psi | 89% | 3061 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,087 psi | 88% | 3051 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,695 psi | 87% | 3028 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 55,637 psi | 86% | 3051 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,826 psi | 87% | 3054 fps | 98% |
| IMR 4831 | <<locked>> | 98% | 57,841 psi | 89% | 3123 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 56,681 psi | 87% | 3097 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,317 psi | 85% | 3012 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,130 psi | 88% | 3045 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,767 psi | 86% | 2992 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,334 psi | 88% | 3048 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,782 psi | 87% | 3054 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 58,088 psi | 89% | 3094 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 55,666 psi | 86% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,043 psi | 86% | 3012 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,899 psi | 89% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,246 psi | 87% | 3100 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 50,575 psi | 78% | 3107 fps | 96.9% |
| Norma URP | <<locked>> | 96% | 56,275 psi | 87% | 3120 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 58,566 psi | 90% | 3127 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,610 psi | 90% | 3169 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 55,666 psi | 86% | 3031 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,550 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 56% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,275 psi | 87% | 3051 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,680 psi | 86% | 3130 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,274 psi | 85% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,246 psi | 88% | 3156 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,985 psi | 86% | 3179 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 56,884 psi | 88% | 2999 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,376 psi | 87% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,709 psi | 86% | 3054 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,200 psi | 82% | 3074 fps | 96% |
| Rottweil R 907 | <<locked>> | 94% | 58,711 psi | 90% | 3081 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,782 psi | 87% | 3054 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,130 psi | 88% | 3045 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,334 psi | 88% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,088 psi | 89% | 3094 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,913 psi | 88% | 3110 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,189 psi | 90% | 3071 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,581 psi | 90% | 3091 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,666 psi | 87% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,913 psi | 88% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,956 psi | 88% | 3002 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,692 psi | 81% | 3068 fps | 95.9% |
| Somchem S335 | <<locked>> | 84% | 56,188 psi | 86% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,653 psi | 89% | 3058 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,695 psi | 86% | 3048 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 58,349 psi | 90% | 3173 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,027 psi | 83% | 3054 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 56,884 psi | 88% | 2930 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,130 psi | 86% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,550 psi | 87% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,956 psi | 88% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 58,508 psi | 90% | 3114 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,956 psi | 86% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,392 psi | 90% | 3035 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,740 psi | 89% | 3120 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,575 psi | 78% | 3064 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,581 psi | 90% | 3084 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,304 psi | 87% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,202 psi | 86% | 3127 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,089 psi | 63% | 3005 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,697 psi | 90% | 3100 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% | 54,447 psi | 84% | 2913 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,109 psi | 74% | 2848 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,969 psi | 85% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,675 psi | 75% | 2867 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 39,755 psi | 61% | 2779 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,440 psi | 70% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,084 psi | 52% | 2667 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 50,169 psi | 77% | 2959 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 42,757 psi | 66% | 2799 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 51,619 psi | 79% | 3041 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,098 psi | 80% | 2959 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,388 psi | 82% | 2940 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,122 psi | 71% | 3002 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,416 psi | 79% | 3038 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,416 psi | 79% | 3038 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,960 psi | 66% | 2828 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,861 psi | 71% | 2894 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 35,607 psi | 55% | 2726 fps | 95.7% |
| Alliant Reloder-17 | 51.4 gr | 80% | 37,492 psi | 58% | 2805 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,749 psi | 78% | 3028 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,517 psi | 48% | 2635 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,477 psi | 56% | 2828 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,487 psi | 76% | 2959 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 43,178 psi | 66% | 2838 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 46,180 psi | 71% | 2858 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,606 psi | 82% | 2943 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,808 psi | 80% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,743 psi | 67% | 2841 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 43,526 psi | 67% | 2887 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 49,777 psi | 77% | 2966 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 50,691 psi | 78% | 2969 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,140 psi | 48% | 2569 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,949 psi | 72% | 2943 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 45,948 psi | 71% | 2963 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,254 psi | 74% | 2910 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,010 psi | 78% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,947 psi | 69% | 2835 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,181 psi | 73% | 2854 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 46,311 psi | 71% | 2884 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,643 psi | 69% | 2831 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 35,041 psi | 54% | 2674 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 47,021 psi | 72% | 2927 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 52,098 psi | 80% | 2959 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,314 psi | 77% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,545 psi | 76% | 2884 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,324 psi | 70% | 2844 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 39,769 psi | 61% | 2726 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 42,931 psi | 66% | 2815 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 49,313 psi | 76% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,661 psi | 76% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,266 psi | 70% | 2881 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 52,808 psi | 81% | 3045 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 44,425 psi | 68% | 2982 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 36,187 psi | 56% | 2720 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 45,020 psi | 69% | 2897 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 39,885 psi | 61% | 2815 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 52,011 psi | 80% | 2969 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,098 psi | 80% | 2995 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 42% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,743 psi | 67% | 2818 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,791 psi | 75% | 3012 fps | 99.3% |
| ReloadSwiss RS 60 | 51.4 gr | 80% | 39,682 psi | 61% | 2871 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,766 psi | 55% | 2733 fps | 95.2% |
| ReloadSwiss RS 70 | 54.8 gr | 84% | 37,681 psi | 58% | 2795 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 53,853 psi | 83% | 2953 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,079 psi | 72% | 2858 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 40,843 psi | 63% | 2782 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 49,879 psi | 77% | 3015 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 46,180 psi | 71% | 2858 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,769 psi | 61% | 2726 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,314 psi | 77% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,324 psi | 70% | 2844 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 42,931 psi | 66% | 2815 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,336 psi | 64% | 2825 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,097 psi | 79% | 2953 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,588 psi | 75% | 2923 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,053 psi | 77% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,163 psi | 65% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,382 psi | 68% | 2782 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,400 psi | 76% | 3009 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,937 psi | 77% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,386 psi | 78% | 2940 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 41,133 psi | 63% | 2779 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 30,632 psi | 47% | 2615 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 47,558 psi | 73% | 2936 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,357 psi | 77% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,775 psi | 72% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,152 psi | 73% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,349 psi | 61% | 2713 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 35,186 psi | 54% | 2661 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,315 psi | 80% | 2956 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,614 psi | 70% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,130 psi | 57% | 2720 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 32,489 psi | 50% | 2667 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,679 psi | 53% | 2631 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 52,649 psi | 81% | 3009 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,526 psi | 67% | 2887 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,979 psi | 46% | 2664 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,457 psi | 75% | 2933 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 100 powders for .280 Ackley Improved loaded with the .284 | 128gr | IBEX TRD. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,196 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 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 128.0 gr projectile in 0.284" calls for a 1:11.0 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-17, ReloadSwiss RS 60 rank at the top here: for .280 Ackley Improved with the .284 | 128gr | IBEX TRD 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.