Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 70gr | Speer TNT bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 47,195 psi | 85% | 3287 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 47,514 psi | 86% | 3333 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 47,094 psi | 85% | 3379 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 47,703 psi | 86% | 3350 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 88% | 49,139 psi | 89% | 3356 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 82% | 49,879 psi | 90% | 3366 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 47,050 psi | 85% | 3451 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,139 psi | 89% | 3386 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 86% | 49,472 psi | 90% | 3402 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 96% | 48,965 psi | 89% | 3461 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,734 psi | 90% | 3501 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,697 psi | 72% | 3241 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 47,456 psi | 86% | 3346 fps | 97.2% |
| Bofors RP3 | <<locked>> | 88% | 49,458 psi | 90% | 3396 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 49,211 psi | 89% | 3386 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 86% | 46,949 psi | 85% | 3330 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 82% | 48,167 psi | 87% | 3366 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,327 psi | 87% | 3379 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 47,427 psi | 86% | 3389 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 64% | 2234 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 49,400 psi | 89% | 3373 fps | 98.9% |
| IMR 3031 | <<locked>> | 82% | 47,776 psi | 86% | 3369 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 48,457 psi | 88% | 3337 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 48,037 psi | 87% | 3379 fps | 97.3% |
| IMR 4895 | <<locked>> | 84% | 47,543 psi | 86% | 3373 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 82% | 49,879 psi | 90% | 3366 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 82% | 47,282 psi | 86% | 3330 fps | 99.8% |
| Lovex S060 | <<locked>> | 82% | 47,587 psi | 86% | 3281 fps | 98.3% |
| Lovex S062 | <<locked>> | 86% | 48,356 psi | 88% | 3340 fps | 99.3% |
| Norma 201 | <<locked>> | 84% | 49,777 psi | 90% | 3363 fps | 99.4% |
| Norma 202 | <<locked>> | 82% | 47,282 psi | 86% | 3314 fps | 100% |
| Norma 203B | <<locked>> | 86% | 48,776 psi | 88% | 3389 fps | 98.5% |
| Norma URP | <<locked>> | 96% | 49,951 psi | 90% | 3442 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 86% | 49,008 psi | 89% | 3402 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 49,951 psi | 90% | 3392 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 65% | 2290 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 49,182 psi | 89% | 3461 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,298 psi | 89% | 3507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 47,079 psi | 85% | 3399 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 84% | 47,268 psi | 86% | 3297 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 90% | 49,327 psi | 89% | 3386 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 47,282 psi | 86% | 3330 fps | 99.8% |
| Shooters World Precision | <<locked>> | 86% | 48,356 psi | 88% | 3340 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 47,587 psi | 86% | 3379 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 48,791 psi | 88% | 3337 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 49,472 psi | 90% | 3376 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 48,109 psi | 87% | 3255 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 48,617 psi | 88% | 3255 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 47,601 psi | 86% | 3248 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 48,356 psi | 88% | 3330 fps | 98.3% |
| Somchem S355 | <<locked>> | 90% | 49,734 psi | 90% | 3386 fps | 99% |
| Somchem S365 | <<locked>> | 98% | 48,080 psi | 87% | 3448 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 82% | 48,385 psi | 88% | 3251 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 49,980 psi | 90% | 3343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 47,703 psi | 86% | 3291 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 47,863 psi | 87% | 3304 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 94% | 48,878 psi | 88% | 3376 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 86% | 49,327 psi | 89% | 3333 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 48,095 psi | 87% | 3373 fps | 96.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,787 psi | 79% | 3346 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,313 psi | 89% | 3350 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 84% | 49,487 psi | 90% | 3386 fps | 99% |
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% | 41,495 psi | 75% | 3173 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,204 psi | 71% | 3150 fps | 99.4% |
| Accurate 4350 | <<locked>> | 90% | 40,915 psi | 74% | 3238 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 44,759 psi | 81% | 3284 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 40,480 psi | 73% | 3159 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,775 psi | 85% | 3301 fps | 99% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,002 psi | 74% | 3297 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,768 psi | 68% | 3120 fps | 96.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,422 psi | 73% | 3192 fps | 95.8% |
| Alliant Reloder-16 | 44.3 gr | 90% | 40,292 psi | 73% | 3248 fps | 95.1% |
| Alliant Reloder-17 | 44.5 gr | 84% | 37,463 psi | 68% | 3199 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 37,420 psi | 68% | 3182 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,266 psi | 80% | 3278 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 37,536 psi | 68% | 3120 fps | 96.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,122 psi | 83% | 3323 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 84% | 43,990 psi | 80% | 3261 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 45,150 psi | 82% | 3301 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 37,115 psi | 67% | 3120 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,249 psi | 75% | 3251 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,121 psi | 47% | 2005 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,366 psi | 78% | 3241 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 44,904 psi | 81% | 3310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,784 psi | 72% | 3136 fps | 95.7% |
| IMR 4831 | <<locked>> | 92% | 42,018 psi | 76% | 3245 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,437 psi | 75% | 3235 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,775 psi | 85% | 3301 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 44,208 psi | 80% | 3264 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 44,672 psi | 81% | 3219 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 39,784 psi | 72% | 3146 fps | 97.6% |
| Norma 201 | <<locked>> | 80% | 43,990 psi | 80% | 3238 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 44,266 psi | 80% | 3251 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 39,813 psi | 72% | 3179 fps | 96.3% |
| Norma URP | <<locked>> | 90% | 40,828 psi | 74% | 3235 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,740 psi | 72% | 3192 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,543 psi | 84% | 3320 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 48% | 2054 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,844 psi | 78% | 3320 fps | 96.4% |
| ReloadSwiss RS 60 | 42.4 gr | 80% | 34,809 psi | 63% | 3136 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,671 psi | 79% | 3323 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 41,785 psi | 76% | 3176 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 35,186 psi | 64% | 3048 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,208 psi | 80% | 3264 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 39,784 psi | 72% | 3146 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 38,812 psi | 70% | 3176 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,426 psi | 82% | 3264 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,555 psi | 79% | 3248 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,976 psi | 81% | 3192 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,463 psi | 68% | 3022 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 44,962 psi | 81% | 3196 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,034 psi | 81% | 3261 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 36,085 psi | 65% | 3064 fps | 95.5% |
| Somchem S365 | <<locked>> | 86% | 31,850 psi | 58% | 3028 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 45,295 psi | 82% | 3189 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,017 psi | 74% | 3166 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,858 psi | 76% | 3169 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 34,258 psi | 62% | 2986 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 90% | 42,772 psi | 77% | 3241 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 40,422 psi | 73% | 3146 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 90% | 42,235 psi | 76% | 3241 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 96% | 38,116 psi | 69% | 3205 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 35,041 psi | 63% | 3009 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,888 psi | 78% | 3241 fps | 97.7% |
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 89 powders for .243 Ackley Improved loaded with the .243 | 70gr | Speer TNT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,507 fps; across all powders the maximum-charge window runs from 2,234 fps to 3,507 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 64–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.243" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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-16, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .243 Ackley Improved with the .243 | 70gr | Speer TNT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.