Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 110gr | Barnes TTSX FB bullet and 103 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 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.
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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>> | 86% | 56,159 psi | 86% | 3179 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 58,450 psi | 90% | 3258 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 58,073 psi | 89% | 3245 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,782 psi | 87% | 3268 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 58,160 psi | 89% | 3235 fps | 96% |
| Accurate 4064 | <<locked>> | 94% | 57,943 psi | 89% | 3291 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,592 psi | 84% | 3307 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 82% | 58,262 psi | 90% | 3169 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,682 psi | 90% | 3202 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 55,593 psi | 86% | 3278 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 94% | 56,739 psi | 87% | 3274 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 88% | 58,233 psi | 90% | 3287 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,158 psi | 85% | 3212 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,130 psi | 86% | 3346 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,550 psi | 85% | 3399 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,347 psi | 87% | 3294 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,506 psi | 85% | 3186 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,290 psi | 88% | 3323 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,649 psi | 81% | 3317 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 58,015 psi | 89% | 3432 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,304 psi | 57% | 2986 fps | 96.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 58,030 psi | 89% | 3159 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,521 psi | 85% | 3287 fps | 98.9% |
| Bofors RP3 | <<locked>> | 94% | 57,043 psi | 88% | 3310 fps | 99.9% |
| Bofors RP7 | <<locked>> | 98% | 57,537 psi | 89% | 3274 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,347 psi | 87% | 3215 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,638 psi | 89% | 3314 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,999 psi | 86% | 3363 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 82% | 55,158 psi | 85% | 3232 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,275 psi | 87% | 3251 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 58,523 psi | 90% | 3327 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3376 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 88% | 56,159 psi | 86% | 3294 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,762 psi | 75% | 3179 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,564 psi | 85% | 3320 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 98% | 55,463 psi | 85% | 3340 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,969 psi | 54% | 2044 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,479 psi | 88% | 3294 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 55,767 psi | 86% | 3278 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,130 psi | 86% | 3258 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,420 psi | 87% | 3232 fps | 96.5% |
| IMR 4198 | <<locked>> | 82% | 55,579 psi | 86% | 3146 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,912 psi | 86% | 3248 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,619 psi | 79% | 3238 fps | 98.3% |
| IMR 4895 | <<locked>> | 92% | 58,769 psi | 90% | 3360 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 58,233 psi | 90% | 3287 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 58,508 psi | 90% | 3268 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,013 psi | 85% | 3248 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 58,697 psi | 90% | 3261 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 55,637 psi | 86% | 3251 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3301 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 3274 fps | 96.8% |
| Norma 201 | <<locked>> | 90% | 57,595 psi | 89% | 3278 fps | 100% |
| Norma 202 | <<locked>> | 90% | 58,320 psi | 90% | 3281 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,449 psi | 87% | 3307 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 53,954 psi | 83% | 3301 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 57,334 psi | 88% | 3333 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,997 psi | 82% | 3287 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 55,056 psi | 85% | 3238 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 58,363 psi | 90% | 3320 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,622 psi | 86% | 3225 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 54% | 2090 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,638 psi | 89% | 3268 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,259 psi | 85% | 3245 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,711 psi | 89% | 3396 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,769 psi | 89% | 3438 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,578 psi | 84% | 3333 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 3366 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 58,059 psi | 89% | 3258 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 58,015 psi | 89% | 3271 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,884 psi | 88% | 3297 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 57,537 psi | 89% | 3274 fps | 96.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3301 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,013 psi | 85% | 3248 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,637 psi | 86% | 3251 fps | 99.9% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 3274 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,435 psi | 88% | 3235 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,332 psi | 85% | 3310 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,565 psi | 87% | 3215 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,276 psi | 88% | 3278 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,609 psi | 89% | 3301 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,869 psi | 86% | 3166 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,014 psi | 86% | 3156 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,579 psi | 86% | 3186 fps | 96.4% |
| Somchem S321 | <<locked>> | 84% | 55,738 psi | 86% | 3258 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 58,552 psi | 90% | 3209 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,652 psi | 87% | 3264 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 57,116 psi | 88% | 3297 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,167 psi | 74% | 3238 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 84% | 55,361 psi | 85% | 3127 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,043 psi | 86% | 3150 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,566 psi | 89% | 3235 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,317 psi | 85% | 3202 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,376 psi | 85% | 3222 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3301 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,071 psi | 85% | 3225 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 57,188 psi | 88% | 3248 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 3301 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,437 psi | 62% | 3074 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,725 psi | 89% | 3284 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,926 psi | 85% | 3278 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3376 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,870 psi | 89% | 3314 fps | 99.9% |
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 2015 | <<locked>> | 80% | 46,296 psi | 71% | 3018 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,981 psi | 78% | 3140 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,551 psi | 59% | 2907 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,035 psi | 71% | 3084 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 54,360 psi | 84% | 3173 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,492 psi | 56% | 2887 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 41,017 psi | 63% | 3041 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 54,708 psi | 84% | 3117 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 55,114 psi | 85% | 3146 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,801 psi | 66% | 3028 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 38,711 psi | 60% | 2910 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,933 psi | 69% | 3048 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,686 psi | 69% | 3045 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,562 psi | 81% | 3284 fps | 99.5% |
| Alliant Power Pro 2000-MR | 53.1 gr | 80% | 38,812 psi | 60% | 3031 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,781 psi | 55% | 2871 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,330 psi | 81% | 3136 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,522 psi | 59% | 2943 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,872 psi | 63% | 3058 fps | 95.8% |
| Alliant Reloder-17 | 54.9 gr | 84% | 35,389 psi | 54% | 2940 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,041 psi | 54% | 2923 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,462 psi | 84% | 3107 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,177 psi | 65% | 3022 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 35,099 psi | 54% | 2864 fps | 96.3% |
| Bofors RP7 | <<locked>> | 96% | 53,722 psi | 83% | 3205 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,659 psi | 72% | 3041 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,555 psi | 67% | 3058 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,399 psi | 74% | 3222 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 51,416 psi | 79% | 3169 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,576 psi | 81% | 3192 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,524 psi | 64% | 2999 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 96% | 50,618 psi | 78% | 3238 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,207 psi | 66% | 3041 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,012 psi | 54% | 2871 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,175 psi | 60% | 2995 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 96% | 51,663 psi | 79% | 3271 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,918 psi | 40% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,452 psi | 64% | 2986 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 42,612 psi | 66% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,043 psi | 59% | 2890 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,823 psi | 81% | 3166 fps | 95.8% |
| IMR 4198 | <<locked>> | 80% | 52,402 psi | 81% | 3097 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,562 psi | 81% | 3189 fps | 95.6% |
| IMR 4831 | <<locked>> | 92% | 39,436 psi | 61% | 2986 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,465 psi | 61% | 2979 fps | 96.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,933 psi | 69% | 3048 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,734 psi | 78% | 3143 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 41,669 psi | 64% | 3002 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 42,931 psi | 66% | 2966 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 37,797 psi | 58% | 2894 fps | 97.5% |
| Lovex S065 | <<locked>> | 92% | 45,455 psi | 70% | 3054 fps | 95.4% |
| Lovex S070 | <<locked>> | 96% | 49,226 psi | 76% | 3150 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 41,727 psi | 64% | 2976 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 42,148 psi | 65% | 2992 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 37,869 psi | 58% | 2927 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 41,031 psi | 63% | 3041 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,420 psi | 58% | 2933 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 96% | 46,195 psi | 71% | 3153 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,005 psi | 69% | 3041 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,382 psi | 68% | 3064 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,544 psi | 75% | 3097 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,121 psi | 40% | 1870 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,314 psi | 77% | 3146 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,283 psi | 74% | 3114 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,350 psi | 62% | 3051 fps | 96.1% |
| ReloadSwiss RS 60 | 52.3 gr | 80% | 32,866 psi | 51% | 2884 fps | 97.1% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,901 psi | 63% | 3061 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,179 psi | 68% | 3143 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 45,440 psi | 70% | 3038 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 39,653 psi | 61% | 2920 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 32,880 psi | 51% | 2795 fps | 95% |
| Rottweil R 907 | <<locked>> | 96% | 53,722 psi | 83% | 3205 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 45,455 psi | 70% | 3054 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,669 psi | 64% | 3002 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 37,797 psi | 58% | 2894 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 96% | 49,226 psi | 76% | 3150 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,374 psi | 82% | 3169 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,695 psi | 56% | 2923 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,287 psi | 82% | 3163 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,989 psi | 66% | 3002 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,365 psi | 64% | 2989 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,337 psi | 67% | 2943 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,868 psi | 55% | 2782 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 52,083 psi | 80% | 3123 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,733 psi | 75% | 3136 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 42,844 psi | 66% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,917 psi | 66% | 3009 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 33,968 psi | 52% | 2815 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 32,010 psi | 49% | 2848 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 49,037 psi | 75% | 3028 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,656 psi | 67% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,088 psi | 60% | 2917 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,769 psi | 61% | 2917 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 32,227 psi | 50% | 2743 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 90% | 40,263 psi | 62% | 2986 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,904 psi | 69% | 3038 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 38,464 psi | 59% | 2897 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 42,424 psi | 65% | 3048 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 98% | 37,768 psi | 58% | 3009 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,447 psi | 55% | 2835 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 44,541 psi | 69% | 3087 fps | 99.4% |
| Winchester 760 | <<locked>> | 96% | 50,908 psi | 78% | 3245 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,828 psi | 63% | 2992 fps | 97.6% |
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 113 powders for .280 Ackley Improved loaded with the .284 | 110gr | Barnes TTSX FB. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,438 fps; across all powders the maximum-charge window runs from 2,044 fps to 3,438 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 110gr | Barnes TTSX FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.