Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 117.5gr | Barnes TSX FB bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 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>> | 88% | 57,392 psi | 88% | 3077 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,970 psi | 86% | 3104 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,143 psi | 85% | 3087 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 58,189 psi | 90% | 3173 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,998 psi | 85% | 3133 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,387 psi | 79% | 3146 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 82% | 56,405 psi | 87% | 3022 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,826 psi | 87% | 3048 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,637 psi | 87% | 3176 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 57,711 psi | 89% | 3173 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 82% | 58,044 psi | 89% | 3153 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,898 psi | 86% | 3133 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 56,362 psi | 87% | 3114 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,580 psi | 89% | 3248 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,710 psi | 87% | 3304 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 57,624 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,043 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 58,218 psi | 90% | 3222 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 3153 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 58,798 psi | 90% | 3327 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,898 psi | 86% | 3012 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,782 psi | 87% | 3189 fps | 99.1% |
| Bofors RP3 | <<locked>> | 96% | 58,030 psi | 89% | 3212 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 58,668 psi | 90% | 3173 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 88% | 57,711 psi | 89% | 3117 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,201 psi | 85% | 3159 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 57,363 psi | 88% | 3268 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 56,724 psi | 87% | 3133 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 57,914 psi | 89% | 3159 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,782 psi | 86% | 3166 fps | 98.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 3205 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 90% | 57,174 psi | 88% | 3189 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,296 psi | 71% | 3025 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,637 psi | 87% | 3225 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3248 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,780 psi | 54% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,332 psi | 85% | 3140 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 56,927 psi | 88% | 3179 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,159 psi | 88% | 3156 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,783 psi | 89% | 3136 fps | 96.8% |
| IMR 4198 | <<locked>> | 84% | 57,392 psi | 88% | 3048 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,043 psi | 88% | 3150 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,979 psi | 75% | 3084 fps | 98% |
| IMR 4895 | <<locked>> | 92% | 56,115 psi | 86% | 3199 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 55,898 psi | 86% | 3133 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 55,985 psi | 86% | 3114 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,231 psi | 87% | 3153 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,434 psi | 87% | 3100 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 56,869 psi | 87% | 3153 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3140 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 3114 fps | 96.2% |
| Norma 201 | <<locked>> | 92% | 58,697 psi | 90% | 3173 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,883 psi | 86% | 3127 fps | 100% |
| Norma 203B | <<locked>> | 94% | 57,334 psi | 88% | 3205 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 50,966 psi | 78% | 3136 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 94% | 58,407 psi | 90% | 3235 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,140 psi | 77% | 3123 fps | 96.3% |
| Ramshot TAC | <<locked>> | 88% | 56,492 psi | 87% | 3143 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,796 psi | 86% | 3163 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,276 psi | 88% | 3133 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,172 psi | 54% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,259 psi | 85% | 3110 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,420 psi | 87% | 3146 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,897 psi | 84% | 3235 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 58,537 psi | 90% | 3330 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,459 psi | 79% | 3169 fps | 98.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 3199 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 88% | 55,956 psi | 86% | 3104 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,680 psi | 86% | 3117 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 57,856 psi | 89% | 3199 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 58,668 psi | 90% | 3173 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3140 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,231 psi | 87% | 3153 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,869 psi | 87% | 3153 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 3114 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,056 psi | 85% | 3081 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 58,407 psi | 90% | 3163 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,202 psi | 86% | 3209 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 58,189 psi | 90% | 3114 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 58,653 psi | 90% | 3179 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,216 psi | 85% | 3146 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 57,101 psi | 88% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 57,392 psi | 88% | 3058 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,971 psi | 88% | 3094 fps | 96.6% |
| Somchem S321 | <<locked>> | 86% | 57,406 psi | 88% | 3169 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,275 psi | 87% | 3058 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 58,030 psi | 89% | 3169 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 58,276 psi | 90% | 3199 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,324 psi | 70% | 3077 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 56,913 psi | 88% | 3028 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,174 psi | 88% | 3048 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 58,769 psi | 90% | 3133 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,492 psi | 87% | 3104 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,405 psi | 87% | 3127 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 3140 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 88% | 56,391 psi | 87% | 3130 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 58,436 psi | 90% | 3150 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,765 psi | 81% | 3143 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,882 psi | 84% | 3127 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 56,086 psi | 86% | 3179 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 3209 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,998 psi | 85% | 3153 fps | 99.7% |
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% | 44,396 psi | 68% | 2874 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,718 psi | 75% | 2989 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,579 psi | 56% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,845 psi | 67% | 2933 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 34,650 psi | 53% | 2743 fps | 99.1% |
| Accurate 4350 | <<locked>> | 92% | 38,595 psi | 59% | 2890 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 52,982 psi | 82% | 2969 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,374 psi | 82% | 2995 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,973 psi | 63% | 2881 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 37,217 psi | 57% | 2769 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 54,114 psi | 83% | 3097 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,091 psi | 66% | 2897 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 42,656 psi | 66% | 2900 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,241 psi | 77% | 3123 fps | 99.3% |
| Alliant Power Pro 2000-MR | 49.8 gr | 82% | 39,842 psi | 61% | 2953 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,171 psi | 53% | 2733 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,183 psi | 77% | 2986 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,753 psi | 57% | 2799 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,957 psi | 60% | 2904 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 84% | 33,895 psi | 52% | 2802 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,446 psi | 81% | 2959 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,248 psi | 62% | 2877 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 33,388 psi | 51% | 2723 fps | 95.9% |
| Bofors RP7 | <<locked>> | 98% | 55,071 psi | 85% | 3114 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,976 psi | 69% | 2897 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,640 psi | 64% | 2913 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,890 psi | 71% | 3061 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 49,516 psi | 76% | 3022 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,517 psi | 78% | 3045 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 42,453 psi | 65% | 2917 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 51,256 psi | 79% | 3140 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 41,307 psi | 64% | 2894 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 33,417 psi | 51% | 2730 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,449 psi | 58% | 2854 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 98% | 52,678 psi | 81% | 3179 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,846 psi | 40% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,914 psi | 61% | 2844 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 40,669 psi | 63% | 2904 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,593 psi | 56% | 2753 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 50,894 psi | 78% | 3015 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 50,749 psi | 78% | 2953 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,488 psi | 78% | 3035 fps | 95.1% |
| IMR 4831 | <<locked>> | 94% | 39,987 psi | 62% | 2904 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 37,608 psi | 58% | 2831 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 43,091 psi | 66% | 2897 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,472 psi | 75% | 2992 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 39,639 psi | 61% | 2858 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 41,510 psi | 64% | 2825 fps | 97.4% |
| Lovex S062 | <<locked>> | 80% | 36,289 psi | 56% | 2756 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 46,224 psi | 71% | 2963 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 50,053 psi | 77% | 3054 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 39,958 psi | 61% | 2831 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 40,408 psi | 62% | 2851 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 36,129 psi | 56% | 2785 fps | 95.7% |
| Norma URP | <<locked>> | 92% | 38,972 psi | 60% | 2894 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 35,752 psi | 55% | 2792 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 98% | 46,833 psi | 72% | 3061 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 43,163 psi | 66% | 2890 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,583 psi | 66% | 2917 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,775 psi | 72% | 2949 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,078 psi | 40% | 1775 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,443 psi | 75% | 2999 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 49,298 psi | 76% | 3022 fps | 95.7% |
| ReloadSwiss RS 52 | 47.1 gr | 80% | 38,305 psi | 59% | 2904 fps | 95.7% |
| ReloadSwiss RS 60 | 47.9 gr | 80% | 31,488 psi | 48% | 2743 fps | 96.7% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,452 psi | 64% | 2972 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 45,005 psi | 69% | 3054 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 43,598 psi | 67% | 2887 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 38,058 psi | 59% | 2779 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 33,707 psi | 52% | 2723 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 98% | 55,071 psi | 85% | 3114 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 46,224 psi | 71% | 2963 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,639 psi | 61% | 2858 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 36,289 psi | 56% | 2756 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 98% | 50,053 psi | 77% | 3054 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,416 psi | 79% | 3018 fps | 99.6% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 54,636 psi | 84% | 3107 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,998 psi | 54% | 2779 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,126 psi | 79% | 3009 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,031 psi | 63% | 2854 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,624 psi | 61% | 2844 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,568 psi | 64% | 2799 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,272 psi | 53% | 2644 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 49,705 psi | 76% | 2972 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 46,615 psi | 72% | 2986 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 41,104 psi | 63% | 2799 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 40,973 psi | 63% | 2861 fps | 97.1% |
| Somchem S355 | <<locked>> | 82% | 34,563 psi | 53% | 2733 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 30,298 psi | 47% | 2703 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,137 psi | 73% | 2881 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,858 psi | 64% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,159 psi | 57% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,101 psi | 59% | 2779 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 30,763 psi | 47% | 2608 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 41,031 psi | 63% | 2900 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 43,091 psi | 66% | 2894 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 36,709 psi | 56% | 2759 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 92% | 40,190 psi | 62% | 2897 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,910 psi | 52% | 2697 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 42,641 psi | 66% | 2940 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 51,532 psi | 79% | 3146 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,928 psi | 60% | 2844 fps | 97.2% |
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 112 powders for .280 Ackley Improved loaded with the .284 | 117.5gr | Barnes TSX FB. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,330 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 117.5 gr projectile in 0.284" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for .280 Ackley Improved with the .284 | 117.5gr | Barnes TSX FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, IMR 4350 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.