Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 110gr | Speer TNT bullet and 99 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, 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>> | 84% | 56,231 psi | 87% | 3182 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,334 psi | 90% | 3261 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,245 psi | 85% | 3205 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,913 psi | 88% | 3271 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,986 psi | 89% | 3248 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 55,347 psi | 85% | 3255 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,651 psi | 86% | 3333 fps | 99% |
| ADI AR 2206H | <<locked>> | 86% | 55,564 psi | 85% | 3284 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 56,536 psi | 87% | 3281 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,015 psi | 89% | 3291 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,274 psi | 85% | 3215 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,419 psi | 85% | 3406 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,768 psi | 87% | 3307 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,406 psi | 88% | 3333 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,565 psi | 87% | 3396 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,160 psi | 89% | 3438 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,654 psi | 63% | 3077 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,730 psi | 70% | 3255 fps | 97% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,448 psi | 85% | 3291 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 57,595 psi | 89% | 3323 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,450 psi | 88% | 3281 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,869 psi | 86% | 3215 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,725 psi | 89% | 3317 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,927 psi | 86% | 3369 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 58,479 psi | 90% | 3287 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 58,697 psi | 90% | 3340 fps | 99% |
| Hodgdon H414 | <<locked>> | 98% | 58,363 psi | 90% | 3386 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 96% | 58,682 psi | 90% | 3343 fps | 96% |
| Hodgdon H4895 | <<locked>> | 86% | 56,115 psi | 86% | 3297 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,663 psi | 81% | 3251 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,695 psi | 86% | 3327 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,651 psi | 86% | 3360 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 54% | 2064 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,348 psi | 88% | 3297 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 56,072 psi | 86% | 3287 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,854 psi | 86% | 3261 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,898 psi | 86% | 3235 fps | 96.8% |
| IMR 4198 | <<locked>> | 82% | 58,450 psi | 90% | 3196 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 3307 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,767 psi | 86% | 3258 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 3317 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 55,245 psi | 85% | 3307 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 58,015 psi | 89% | 3291 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 58,305 psi | 90% | 3271 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,521 psi | 85% | 3258 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,247 psi | 90% | 3261 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 55,985 psi | 86% | 3264 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,317 psi | 85% | 3251 fps | 97.9% |
| Lovex S070 | <<locked>> | 98% | 56,492 psi | 87% | 3291 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 57,624 psi | 89% | 3284 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,233 psi | 90% | 3284 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,579 psi | 87% | 3317 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 58,276 psi | 90% | 3379 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 90% | 57,450 psi | 88% | 3343 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,101 psi | 88% | 3366 fps | 98% |
| Ramshot TAC | <<locked>> | 86% | 58,407 psi | 90% | 3301 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 58,189 psi | 90% | 3327 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,071 psi | 85% | 3225 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,810 psi | 55% | 2113 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,217 psi | 88% | 3271 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,056 psi | 85% | 3251 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,914 psi | 89% | 3406 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,943 psi | 89% | 3445 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,274 psi | 85% | 3350 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,810 psi | 84% | 3376 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 58,523 psi | 90% | 3271 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 58,320 psi | 90% | 3284 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,435 psi | 88% | 3314 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 57,450 psi | 88% | 3281 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,317 psi | 85% | 3251 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,521 psi | 85% | 3258 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,985 psi | 86% | 3264 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,492 psi | 87% | 3291 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,535 psi | 85% | 3317 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,927 psi | 88% | 3278 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,464 psi | 88% | 3304 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,506 psi | 85% | 3166 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,941 psi | 86% | 3159 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,695 psi | 86% | 3199 fps | 96.7% |
| Somchem S321 | <<locked>> | 82% | 55,680 psi | 86% | 3264 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,421 psi | 90% | 3212 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,507 psi | 87% | 3271 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 57,479 psi | 88% | 3310 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,431 psi | 81% | 3317 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 58,595 psi | 90% | 3179 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,753 psi | 86% | 3150 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,030 psi | 89% | 3245 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,201 psi | 85% | 3205 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,579 psi | 86% | 3232 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,101 psi | 88% | 3314 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 58,682 psi | 90% | 3291 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,087 psi | 88% | 3251 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,231 psi | 87% | 3320 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,701 psi | 69% | 3166 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,595 psi | 89% | 3291 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,897 psi | 84% | 3281 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 58,624 psi | 90% | 3389 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,492 psi | 56% | 3058 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,740 psi | 89% | 3317 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% | 49,559 psi | 76% | 3077 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,694 psi | 84% | 3205 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,351 psi | 65% | 2982 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,676 psi | 76% | 3153 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,157 psi | 83% | 3179 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 40,016 psi | 62% | 2966 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 39,088 psi | 60% | 2995 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,861 psi | 71% | 3100 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 38,827 psi | 60% | 2920 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,950 psi | 74% | 3114 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 48,399 psi | 74% | 3110 fps | 100% |
| Alliant Power Pro 2000-MR | 55.4 gr | 80% | 41,698 psi | 64% | 3117 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,566 psi | 59% | 2946 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,553 psi | 64% | 3018 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 38,711 psi | 60% | 3012 fps | 95.3% |
| Alliant Reloder-17 | 54.6 gr | 80% | 33,460 psi | 51% | 2887 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 96% | 35,723 psi | 55% | 2949 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,467 psi | 65% | 3176 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,179 psi | 70% | 3094 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 38,363 psi | 59% | 2946 fps | 97.6% |
| Bofors RP7 | <<locked>> | 92% | 50,807 psi | 78% | 3159 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,574 psi | 76% | 3104 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,876 psi | 72% | 3127 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,837 psi | 80% | 3294 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 54,766 psi | 84% | 3228 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 41,901 psi | 64% | 3012 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 51,184 psi | 79% | 3255 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 94% | 55,056 psi | 85% | 3278 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,325 psi | 71% | 3114 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 33,257 psi | 51% | 2825 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,380 psi | 65% | 3071 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 94% | 51,547 psi | 79% | 3278 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 40% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,324 psi | 68% | 3054 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 45,919 psi | 71% | 3114 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,741 psi | 63% | 2959 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 49,269 psi | 76% | 3110 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 55,288 psi | 85% | 3150 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 50,966 psi | 78% | 3182 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 49,414 psi | 76% | 3140 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 40,234 psi | 62% | 3005 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 42,598 psi | 66% | 3054 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,950 psi | 74% | 3114 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 54,389 psi | 84% | 3209 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,049 psi | 69% | 3074 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 45,498 psi | 70% | 3028 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 40,712 psi | 63% | 2966 fps | 98.4% |
| Lovex S065 | <<locked>> | 88% | 43,105 psi | 66% | 3009 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 49,661 psi | 76% | 3163 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,773 psi | 69% | 3045 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 45,150 psi | 69% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,944 psi | 63% | 3009 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 38,957 psi | 60% | 2992 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,466 psi | 62% | 3009 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 46,731 psi | 72% | 3173 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,863 psi | 74% | 3107 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,485 psi | 73% | 3133 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,808 psi | 80% | 3166 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,745 psi | 41% | 1896 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,693 psi | 83% | 3212 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 48,283 psi | 74% | 3120 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,918 psi | 68% | 3136 fps | 97.4% |
| ReloadSwiss RS 60 | 54.6 gr | 80% | 35,592 psi | 55% | 2969 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,742 psi | 64% | 3081 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 44,585 psi | 69% | 3163 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,863 psi | 75% | 3104 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,670 psi | 66% | 2992 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,085 psi | 56% | 2881 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 92% | 50,807 psi | 78% | 3159 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,105 psi | 66% | 3009 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,049 psi | 69% | 3074 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 40,712 psi | 63% | 2966 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 49,661 psi | 76% | 3163 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,130 psi | 57% | 2936 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,195 psi | 71% | 3077 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,411 psi | 68% | 3061 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,977 psi | 71% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,334 psi | 59% | 2841 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 48,820 psi | 75% | 3074 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,967 psi | 80% | 3199 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 45,658 psi | 70% | 2999 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,963 psi | 71% | 3077 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 36,825 psi | 57% | 2890 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 30,647 psi | 47% | 2805 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,808 psi | 80% | 3077 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,311 psi | 71% | 2995 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,061 psi | 65% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,801 psi | 66% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,085 psi | 54% | 2818 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 40,901 psi | 63% | 3002 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 47,950 psi | 74% | 3107 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 41,307 psi | 64% | 2966 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 40,263 psi | 62% | 2999 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 94% | 36,521 psi | 56% | 2976 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 33,344 psi | 51% | 2782 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 47,921 psi | 74% | 3156 fps | 99.8% |
| Winchester 760 | <<locked>> | 92% | 47,921 psi | 74% | 3189 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 34,026 psi | 52% | 2979 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,947 psi | 68% | 3064 fps | 98.5% |
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 | 110gr | Speer TNT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,445 fps; across all powders the maximum-charge window runs from 2,064 fps to 3,445 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 54–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.284" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .280 Ackley Improved with the .284 | 110gr | Speer TNT 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.