Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 76gr | TWENTY-NINE ERTP bullet and 66 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 ReloadSwiss RS 70.
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% | 47,282 psi | 86% | 3166 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 47,688 psi | 86% | 3219 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 47,094 psi | 85% | 3268 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 82% | 48,051 psi | 87% | 3238 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 88% | 49,110 psi | 89% | 3238 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 47,007 psi | 85% | 3333 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 48,863 psi | 88% | 3261 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 86% | 49,487 psi | 90% | 3284 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 96% | 48,921 psi | 89% | 3343 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,574 psi | 90% | 3379 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,639 psi | 72% | 3140 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,904 psi | 81% | 3323 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 47,355 psi | 86% | 3232 fps | 97.7% |
| Bofors RP3 | <<locked>> | 88% | 49,356 psi | 89% | 3278 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 49,342 psi | 89% | 3271 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 86% | 47,152 psi | 85% | 3219 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 48,544 psi | 88% | 3251 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,385 psi | 88% | 3268 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 47,616 psi | 86% | 3274 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 64% | 2129 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 49,559 psi | 90% | 3255 fps | 99.2% |
| IMR 3031 | <<locked>> | 82% | 47,964 psi | 87% | 3248 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 48,602 psi | 88% | 3222 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 48,138 psi | 87% | 3268 fps | 97.8% |
| IMR 4895 | <<locked>> | 84% | 47,413 psi | 86% | 3251 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 82% | 47,529 psi | 86% | 3215 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 47,776 psi | 86% | 3166 fps | 98.7% |
| Lovex S062 | <<locked>> | 86% | 48,559 psi | 88% | 3225 fps | 99.5% |
| Lovex S065 | <<locked>> | 92% | 48,022 psi | 87% | 3205 fps | 96.3% |
| Norma 201 | <<locked>> | 84% | 49,835 psi | 90% | 3241 fps | 99.6% |
| Norma 202 | <<locked>> | 82% | 47,239 psi | 85% | 3192 fps | 100% |
| Norma 203B | <<locked>> | 86% | 48,791 psi | 88% | 3268 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 49,966 psi | 90% | 3327 fps | 98% |
| Ramshot Big Game | <<locked>> | 86% | 49,110 psi | 89% | 3287 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 96% | 48,979 psi | 89% | 3310 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 49,777 psi | 90% | 3271 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,636 psi | 64% | 2178 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 49,269 psi | 89% | 3343 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,269 psi | 89% | 3389 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 47,050 psi | 85% | 3287 fps | 97.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 46,644 psi | 84% | 3297 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 84% | 47,514 psi | 86% | 3186 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 90% | 49,240 psi | 89% | 3264 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 48,022 psi | 87% | 3205 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 47,529 psi | 86% | 3215 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 48,559 psi | 88% | 3225 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 47,616 psi | 86% | 3264 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 48,660 psi | 88% | 3219 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 49,559 psi | 90% | 3258 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 48,124 psi | 87% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 48,385 psi | 88% | 3130 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 47,819 psi | 87% | 3130 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 48,225 psi | 87% | 3212 fps | 98.6% |
| Somchem S355 | <<locked>> | 90% | 49,588 psi | 90% | 3264 fps | 99.2% |
| Somchem S365 | <<locked>> | 98% | 47,993 psi | 87% | 3330 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 82% | 48,385 psi | 88% | 3127 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 49,980 psi | 90% | 3215 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 47,848 psi | 87% | 3173 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 47,776 psi | 86% | 3189 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 94% | 48,849 psi | 88% | 3261 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 86% | 49,458 psi | 90% | 3219 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 48,225 psi | 87% | 3264 fps | 97.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,439 psi | 79% | 3232 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,168 psi | 89% | 3235 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,621 psi | 64% | 3114 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 49,371 psi | 89% | 3264 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% | 41,553 psi | 75% | 3058 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,262 psi | 71% | 3038 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 40,930 psi | 74% | 3133 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 44,918 psi | 81% | 3169 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,218 psi | 69% | 2992 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,973 psi | 74% | 3186 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,869 psi | 69% | 3015 fps | 97.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,640 psi | 74% | 3087 fps | 96.5% |
| Alliant Reloder-16 | 42 gr | 90% | 40,437 psi | 73% | 3143 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 82% | 35,128 psi | 64% | 3025 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 35,085 psi | 63% | 3015 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,524 psi | 75% | 3238 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,295 psi | 80% | 3166 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 37,507 psi | 68% | 3012 fps | 97.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,079 psi | 83% | 3205 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 82% | 41,060 psi | 74% | 3081 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 45,339 psi | 82% | 3186 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,925 psi | 63% | 2956 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,394 psi | 75% | 3140 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 47% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,555 psi | 79% | 3127 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 44,904 psi | 81% | 3192 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,118 psi | 73% | 3035 fps | 96.4% |
| IMR 4831 | <<locked>> | 90% | 39,247 psi | 71% | 3071 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,626 psi | 75% | 3123 fps | 97.4% |
| Lovex D073.6 | <<locked>> | 80% | 44,309 psi | 80% | 3150 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 44,962 psi | 81% | 3107 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 40,118 psi | 73% | 3041 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 44,933 psi | 81% | 3140 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,106 psi | 80% | 3123 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 44,367 psi | 80% | 3133 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 40,001 psi | 72% | 3071 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 40,770 psi | 74% | 3127 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,682 psi | 72% | 3081 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 45,788 psi | 83% | 3241 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,557 psi | 84% | 3205 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 48% | 1959 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,656 psi | 77% | 3202 fps | 96.9% |
| ReloadSwiss RS 60 | 40.2 gr | 80% | 34,940 psi | 63% | 3038 fps | 98.1% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,524 psi | 73% | 3143 fps | 95.3% |
| ReloadSwiss RS 70 | 46.9 gr | 92% | 43,584 psi | 79% | 3225 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 41,742 psi | 76% | 3061 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,317 psi | 64% | 2946 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,933 psi | 81% | 3140 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,309 psi | 80% | 3150 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 40,118 psi | 73% | 3041 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,158 psi | 65% | 2999 fps | 95.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,440 psi | 82% | 3153 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,323 psi | 78% | 3127 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,179 psi | 82% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,623 psi | 68% | 2910 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 45,020 psi | 81% | 3077 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,063 psi | 82% | 3146 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 36,187 psi | 65% | 2959 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 31,850 psi | 58% | 2930 fps | 96% |
| Vihtavuori N133 | <<locked>> | 80% | 45,498 psi | 82% | 3074 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,176 psi | 75% | 3051 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,989 psi | 76% | 3058 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 34,389 psi | 62% | 2884 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 39,842 psi | 72% | 3064 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 40,422 psi | 73% | 3035 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 42,032 psi | 76% | 3130 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 96% | 38,130 psi | 69% | 3107 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 35,085 psi | 63% | 2913 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,301 psi | 60% | 3031 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,076 psi | 78% | 3133 fps | 98.2% |
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 66 powders for .243 Ackley Improved loaded with the .243 | 76gr | TWENTY-NINE ERTP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,389 fps; across all powders the maximum-charge window runs from 2,129 fps to 3,389 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 66 of the 66 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 76.0 gr projectile in 0.243" calls for a 1:8.5 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-16, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 76gr | TWENTY-NINE ERTP 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.