Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 75gr | Impala LW CFN bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 70 and ReloadSwiss RS 62.
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 2495 | <<locked>> | 82% | 49,951 psi | 90% | 3212 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 47,036 psi | 85% | 3202 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 48,994 psi | 89% | 3307 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 49,545 psi | 90% | 3255 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 47,659 psi | 86% | 3353 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 49,821 psi | 90% | 3284 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 47,384 psi | 86% | 3241 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 49,356 psi | 89% | 3360 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 47,007 psi | 85% | 3333 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,714 psi | 79% | 3245 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,356 psi | 89% | 3432 fps | 97.8% |
| Bofors RP3 | <<locked>> | 84% | 47,659 psi | 86% | 3245 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 84% | 47,964 psi | 87% | 3238 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 49,327 psi | 89% | 3291 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 48,457 psi | 88% | 3297 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 65% | 2159 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,719 psi | 90% | 3264 fps | 99.2% |
| IMR 4064 | <<locked>> | 84% | 48,965 psi | 89% | 3235 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 49,197 psi | 89% | 3294 fps | 98% |
| IMR 4895 | <<locked>> | 82% | 48,486 psi | 88% | 3278 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 49,400 psi | 89% | 3241 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 49,008 psi | 89% | 3228 fps | 96.5% |
| Norma 203B | <<locked>> | 84% | 49,458 psi | 90% | 3287 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 47,863 psi | 87% | 3291 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 84% | 49,487 psi | 90% | 3301 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 49,559 psi | 90% | 3327 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,622 psi | 66% | 2208 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,879 psi | 90% | 3406 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 48,196 psi | 87% | 3317 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 47,427 psi | 86% | 3327 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 82% | 48,602 psi | 88% | 3209 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 86% | 47,790 psi | 86% | 3238 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 49,008 psi | 89% | 3228 fps | 96.5% |
| Shooters World Precision | <<locked>> | 84% | 49,400 psi | 89% | 3241 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 48,414 psi | 88% | 3287 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 48,907 psi | 89% | 3146 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 47,935 psi | 87% | 3235 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 49,240 psi | 89% | 3360 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 48,167 psi | 87% | 3189 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 48,414 psi | 88% | 3189 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 48,675 psi | 88% | 3209 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 49,893 psi | 90% | 3287 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 49,908 psi | 90% | 3232 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 49,095 psi | 89% | 3284 fps | 97.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,457 psi | 88% | 3340 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,734 psi | 90% | 3255 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,871 psi | 72% | 3255 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 82% | 49,821 psi | 90% | 3278 fps | 99.3% |
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 2495 | <<locked>> | 80% | 46,789 psi | 85% | 3153 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 44,179 psi | 80% | 3143 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 40,016 psi | 72% | 3110 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 41,278 psi | 75% | 3068 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,382 psi | 80% | 3278 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,727 psi | 76% | 3110 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,483 psi | 80% | 3179 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 38,798 psi | 70% | 3104 fps | 95.1% |
| Alliant Reloder-17 | 41 gr | 80% | 36,274 psi | 66% | 3061 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 92% | 34,534 psi | 62% | 2999 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,989 psi | 78% | 3281 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 41,843 psi | 76% | 3117 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 80% | 42,235 psi | 76% | 3110 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 34,113 psi | 62% | 2933 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,121 psi | 82% | 3228 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 49% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,920 psi | 85% | 3209 fps | 98.8% |
| IMR 4064 | <<locked>> | 80% | 43,366 psi | 78% | 3114 fps | 97.3% |
| IMR 4831 | <<locked>> | 88% | 40,785 psi | 74% | 3110 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,513 psi | 82% | 3215 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 43,816 psi | 79% | 3127 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 43,598 psi | 79% | 3110 fps | 95% |
| Norma 203B | <<locked>> | 80% | 43,888 psi | 79% | 3166 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 39,610 psi | 72% | 3100 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,279 psi | 78% | 3169 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 46,514 psi | 84% | 3264 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 49% | 1978 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,392 psi | 69% | 3140 fps | 99.1% |
| ReloadSwiss RS 62 | 45.1 gr | 88% | 42,264 psi | 76% | 3186 fps | 95.8% |
| ReloadSwiss RS 70 | 46.8 gr | 90% | 44,295 psi | 80% | 3251 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 45,919 psi | 83% | 3153 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 39,610 psi | 72% | 3058 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 43,598 psi | 79% | 3110 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 43,816 psi | 79% | 3127 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,987 psi | 72% | 3097 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,075 psi | 74% | 2992 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,885 psi | 72% | 3051 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 31,546 psi | 57% | 2917 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 45,411 psi | 82% | 3136 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,716 psi | 83% | 3136 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,159 psi | 69% | 2979 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 41,046 psi | 74% | 3097 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 44,121 psi | 80% | 3117 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 40,727 psi | 74% | 3100 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 37,710 psi | 68% | 3097 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,866 psi | 61% | 2881 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 34,998 psi | 63% | 3094 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,731 psi | 85% | 3215 fps | 98.9% |
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 48 powders for .243 Ackley Improved loaded with the .243 | 75gr | Impala LW CFN. Alliant Reloder-26 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,159 fps to 3,432 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 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 75.0 gr projectile in 0.243" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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. Alliant Reloder-17, ReloadSwiss RS 70, ReloadSwiss RS 62 rank at the top here: for .243 Ackley Improved with the .243 | 75gr | Impala LW CFN 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.