Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 88gr | CutEdge MTH bullet and 63 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 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% | 47,398 psi | 86% | 2972 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,806 psi | 90% | 3015 fps | 96% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,687 psi | 83% | 3025 fps | 97% |
| Accurate 4064 | <<locked>> | 84% | 47,718 psi | 86% | 3022 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 47,935 psi | 87% | 3100 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 86% | 49,516 psi | 90% | 3058 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 47,587 psi | 86% | 3159 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 49,516 psi | 90% | 3081 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 84% | 49,763 psi | 90% | 3097 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 49,603 psi | 90% | 3176 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 46,731 psi | 85% | 3136 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,308 psi | 78% | 3058 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,095 psi | 89% | 3245 fps | 99.1% |
| Bofors RP3 | <<locked>> | 86% | 49,734 psi | 90% | 3091 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 47,326 psi | 86% | 3041 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 90% | 47,587 psi | 86% | 3097 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 49,385 psi | 89% | 3097 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 48,182 psi | 87% | 3094 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 65% | 1995 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,617 psi | 90% | 3064 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 48,602 psi | 88% | 3035 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 82% | 48,240 psi | 87% | 3002 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,689 psi | 88% | 3038 fps | 96.5% |
| IMR 4831 | <<locked>> | 94% | 49,037 psi | 89% | 3104 fps | 99.1% |
| IMR 4895 | <<locked>> | 82% | 47,950 psi | 87% | 3074 fps | 99.5% |
| Lovex S062 | <<locked>> | 84% | 48,559 psi | 88% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 48,182 psi | 87% | 3031 fps | 97.8% |
| Lovex S070 | <<locked>> | 92% | 49,052 psi | 89% | 3068 fps | 97% |
| Norma 201 | <<locked>> | 82% | 49,908 psi | 90% | 3051 fps | 100% |
| Norma 203B | <<locked>> | 84% | 49,023 psi | 89% | 3084 fps | 99.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,573 psi | 88% | 3192 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 47,427 psi | 86% | 3091 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 84% | 49,501 psi | 90% | 3107 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 94% | 49,690 psi | 90% | 3143 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,201 psi | 66% | 2041 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 47,529 psi | 86% | 3022 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 49,966 psi | 90% | 3163 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,821 psi | 90% | 3202 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 47,979 psi | 87% | 3123 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 47,108 psi | 85% | 3140 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 47,558 psi | 86% | 2999 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 88% | 49,632 psi | 90% | 3081 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 48,182 psi | 87% | 3031 fps | 97.8% |
| Shooters World Precision | <<locked>> | 84% | 48,559 psi | 88% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 49,052 psi | 89% | 3068 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 48,298 psi | 87% | 3091 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 49,734 psi | 90% | 3071 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 48,588 psi | 88% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 47,906 psi | 87% | 2972 fps | 96.5% |
| Somchem S355 | <<locked>> | 86% | 47,137 psi | 85% | 3028 fps | 99.7% |
| Somchem S365 | <<locked>> | 96% | 49,052 psi | 89% | 3156 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 48,501 psi | 88% | 3077 fps | 96% |
| Vihtavuori N135 | <<locked>> | 82% | 47,210 psi | 85% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 47,892 psi | 87% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 48,066 psi | 87% | 3009 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 49,661 psi | 90% | 3094 fps | 99% |
| Vihtavuori N540 | <<locked>> | 84% | 49,617 psi | 90% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 48,660 psi | 88% | 3091 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,167 psi | 87% | 3143 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,559 psi | 90% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 47,587 psi | 86% | 3097 fps | 96.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,653 psi | 70% | 3068 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 82% | 49,763 psi | 90% | 3081 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 2495 | <<locked>> | 80% | 44,338 psi | 80% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,485 psi | 84% | 2949 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 39,581 psi | 72% | 2894 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,974 psi | 76% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,940 psi | 65% | 2838 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 40,770 psi | 74% | 2877 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,338 psi | 80% | 3091 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,654 psi | 74% | 2904 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,584 psi | 79% | 2976 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,897 psi | 65% | 2858 fps | 96% |
| Alliant Reloder-17 | 39.8 gr | 80% | 35,375 psi | 64% | 2871 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,111 psi | 56% | 2740 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,622 psi | 66% | 2953 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 40,350 psi | 73% | 2904 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 41,089 psi | 74% | 2910 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 44,367 psi | 80% | 3028 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,835 psi | 56% | 2677 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,904 psi | 81% | 3028 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 48% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,601 psi | 84% | 3009 fps | 99.6% |
| IMR 4064 | <<locked>> | 80% | 42,830 psi | 78% | 2920 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,353 psi | 82% | 2946 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,832 psi | 83% | 2979 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 34,679 psi | 63% | 2785 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 44,686 psi | 81% | 3009 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 42,815 psi | 77% | 2920 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 39,769 psi | 72% | 2851 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 43,047 psi | 78% | 2943 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 46,891 psi | 85% | 2992 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 42,946 psi | 78% | 2963 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 45,542 psi | 82% | 3130 fps | 95.7% |
| Norma URP | <<locked>> | 84% | 36,274 psi | 66% | 2841 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 43,033 psi | 78% | 2979 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 40,567 psi | 73% | 2949 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 48% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,481 psi | 75% | 2894 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,441 psi | 84% | 3094 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,695 psi | 68% | 2946 fps | 99.8% |
| ReloadSwiss RS 62 | 41.7 gr | 84% | 35,853 psi | 65% | 2854 fps | 95.4% |
| ReloadSwiss RS 70 | 43.4 gr | 86% | 38,174 psi | 69% | 2930 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 44,672 psi | 81% | 2940 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,956 psi | 69% | 2841 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,769 psi | 72% | 2851 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 42,815 psi | 77% | 2920 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 43,047 psi | 78% | 2943 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,117 psi | 71% | 2897 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,485 psi | 84% | 3009 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,364 psi | 73% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,904 psi | 81% | 2913 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 38,725 psi | 70% | 2851 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 28,137 psi | 51% | 2654 fps | 96% |
| Somchem S385 | <<locked>> | 96% | 45,469 psi | 82% | 3018 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 44,541 psi | 81% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,962 psi | 81% | 2927 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,883 psi | 67% | 2779 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 35,389 psi | 64% | 2785 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 43,265 psi | 78% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,289 psi | 67% | 2844 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 90% | 33,982 psi | 61% | 2828 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,677 psi | 59% | 2694 fps | 96.8% |
| Winchester 760 | <<locked>> | 88% | 44,367 psi | 80% | 3028 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,414 psi | 53% | 2762 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,427 psi | 84% | 3022 fps | 99.6% |
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 63 powders for .243 Ackley Improved loaded with the .243 | 88gr | CutEdge MTH. Alliant Reloder-26 delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,995 fps to 3,245 fps. Accurate 3100 gives the best case fill at 100 %, and 63 of the 63 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 88.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, ReloadSwiss RS 62 rank at the top here: for .243 Ackley Improved with the .243 | 88gr | CutEdge MTH 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.