Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 77gr | IBEX TRD bullet and 47 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 Alliant Reloder-26.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100ᴾ | <<locked>> | 100% | 47,427 psi | 86% | 3202 fps | 96.1% |
| Accurate 4064 | <<locked>> | 82% | 47,659 psi | 86% | 3176 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 49,516 psi | 90% | 3284 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 84% | 47,079 psi | 85% | 3166 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 48,283 psi | 87% | 3333 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 47,674 psi | 86% | 3205 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 82% | 47,993 psi | 87% | 3222 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 47,311 psi | 86% | 3281 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 47,776 psi | 86% | 3314 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,512 psi | 81% | 3232 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 46,775 psi | 85% | 3343 fps | 97.4% |
| Bofors RP3 | <<locked>> | 84% | 48,269 psi | 87% | 3222 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 48,544 psi | 88% | 3215 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 46,949 psi | 85% | 3212 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 48,820 psi | 88% | 3268 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 65% | 2133 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 49,545 psi | 90% | 3212 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 46,876 psi | 85% | 3215 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 49,110 psi | 89% | 3258 fps | 99% |
| Lovex S062 | <<locked>> | 84% | 50,009 psi | 90% | 3219 fps | 99.7% |
| Lovex S065 | <<locked>> | 90% | 49,617 psi | 90% | 3209 fps | 96.9% |
| Norma 203B | <<locked>> | 82% | 47,326 psi | 86% | 3209 fps | 98.7% |
| Norma URP | <<locked>> | 92% | 48,298 psi | 87% | 3264 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 82% | 47,123 psi | 85% | 3219 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 92% | 47,297 psi | 86% | 3248 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,666 psi | 66% | 2182 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 48,747 psi | 88% | 3192 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 47,471 psi | 86% | 3323 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 49,037 psi | 89% | 3301 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 47,892 psi | 87% | 3304 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 49,139 psi | 89% | 3182 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 86% | 48,501 psi | 88% | 3215 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 49,617 psi | 90% | 3209 fps | 96.9% |
| Shooters World Precision | <<locked>> | 84% | 50,009 psi | 90% | 3219 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 49,139 psi | 89% | 3264 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 49,516 psi | 90% | 3120 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 48,588 psi | 88% | 3212 fps | 99.2% |
| Somchem S365 | <<locked>> | 96% | 49,879 psi | 90% | 3337 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 48,747 psi | 88% | 3159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 48,994 psi | 89% | 3163 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 49,385 psi | 89% | 3189 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 47,442 psi | 86% | 3205 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 47,514 psi | 86% | 3150 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 49,864 psi | 90% | 3268 fps | 98% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,429 psi | 89% | 3323 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 47,166 psi | 85% | 3173 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,350 psi | 73% | 3241 fps | 98.9% |
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 3100 | <<locked>> | 98% | 44,309 psi | 80% | 3136 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 44,744 psi | 81% | 3117 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 38,072 psi | 69% | 3028 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 41,989 psi | 76% | 3051 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,991 psi | 81% | 3258 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,250 psi | 76% | 3087 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,034 psi | 81% | 3159 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 39,334 psi | 71% | 3087 fps | 95.7% |
| Alliant Reloder-17 | 40.8 gr | 80% | 36,811 psi | 67% | 3045 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 35,114 psi | 64% | 2986 fps | 95.9% |
| Alliant Reloder-26 | 49.1 gr | 94% | 40,785 psi | 74% | 3196 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 42,424 psi | 77% | 3097 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 80% | 42,786 psi | 77% | 3091 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 32,634 psi | 59% | 2858 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,788 psi | 83% | 3205 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,992 psi | 49% | 1909 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,121 psi | 80% | 3097 fps | 97.7% |
| IMR 4831 | <<locked>> | 86% | 38,856 psi | 70% | 3031 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 46,079 psi | 83% | 3192 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 44,396 psi | 80% | 3104 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 44,135 psi | 80% | 3091 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 44,440 psi | 80% | 3146 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 40,234 psi | 73% | 3084 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 43,947 psi | 80% | 3150 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 44,411 psi | 80% | 3182 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 50% | 1959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 45,847 psi | 83% | 3130 fps | 95.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,957 psi | 70% | 3120 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 40,074 psi | 73% | 3100 fps | 95.4% |
| ReloadSwiss RS 70 | 45.6 gr | 88% | 42,264 psi | 76% | 3169 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 46,412 psi | 84% | 3130 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 40,147 psi | 73% | 3038 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 44,135 psi | 80% | 3091 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 44,396 psi | 80% | 3104 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,567 psi | 73% | 3081 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,524 psi | 75% | 2969 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,437 psi | 73% | 3031 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 30,269 psi | 55% | 2844 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 45,934 psi | 83% | 3110 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,253 psi | 84% | 3110 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,667 psi | 70% | 2963 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 39,044 psi | 71% | 3015 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 44,657 psi | 81% | 3094 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 41,307 psi | 75% | 3081 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 35,955 psi | 65% | 3018 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,330 psi | 62% | 2864 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 94% | 33,533 psi | 61% | 3018 fps | 95.8% |
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 47 powders for .243 Ackley Improved loaded with the .243 | 77gr | IBEX TRD. Alliant Reloder-26 delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,133 fps to 3,343 fps. Accurate 3100 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 77.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Hodgdon TrailBoss 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, Alliant Reloder-26 rank at the top here: for .243 Ackley Improved with the .243 | 77gr | 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.