Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 90gr | Speer Deep Curl Soft Point bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Norma MRP.
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 3100 | <<locked>> | 98% | 47,413 psi | 86% | 3028 fps | 97.8% |
| Accurate 4064 | <<locked>> | 82% | 49,124 psi | 89% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 49,168 psi | 89% | 3094 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 84% | 49,763 psi | 90% | 3038 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 47,210 psi | 85% | 3009 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 47,282 psi | 86% | 3104 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 47,616 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,558 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,611 psi | 75% | 3009 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 46,963 psi | 85% | 3176 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 47,543 psi | 86% | 3018 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 47,471 psi | 86% | 2989 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 82% | 47,935 psi | 87% | 3025 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 88% | 48,341 psi | 87% | 3084 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 47,442 psi | 86% | 3031 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 48,153 psi | 87% | 3110 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,201 psi | 66% | 1991 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 49,037 psi | 89% | 3015 fps | 99.6% |
| IMR 4350 | <<locked>> | 90% | 48,153 psi | 87% | 3022 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 49,139 psi | 89% | 3025 fps | 97.1% |
| IMR 4831 | <<locked>> | 92% | 49,893 psi | 90% | 3091 fps | 99.4% |
| Lovex S062 | <<locked>> | 82% | 49,240 psi | 89% | 3018 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 48,936 psi | 89% | 3022 fps | 98.3% |
| Lovex S070 | <<locked>> | 88% | 47,007 psi | 85% | 3002 fps | 97% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,032 psi | 76% | 2923 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 49,647 psi | 90% | 3064 fps | 99.8% |
| Norma MRP | <<locked>> | 96% | 46,427 psi | 84% | 3123 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 48,631 psi | 88% | 3084 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 82% | 49,951 psi | 90% | 3087 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 90% | 47,384 psi | 86% | 3074 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 66% | 2037 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 47,892 psi | 87% | 3002 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 47,253 psi | 86% | 3127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 49,284 psi | 89% | 3120 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 47,877 psi | 87% | 3133 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 84% | 47,442 psi | 86% | 3012 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 47,471 psi | 86% | 2989 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 48,936 psi | 89% | 3022 fps | 98.3% |
| Shooters World Precision | <<locked>> | 82% | 49,240 psi | 89% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 47,007 psi | 85% | 3002 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 48,805 psi | 88% | 3071 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 49,211 psi | 89% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 48,718 psi | 88% | 2969 fps | 97.2% |
| Somchem S355 | <<locked>> | 84% | 47,848 psi | 87% | 3012 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 47,326 psi | 86% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 49,806 psi | 90% | 3077 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 86% | 48,863 psi | 88% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 47,384 psi | 86% | 3025 fps | 98.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,182 psi | 89% | 3048 fps | 96.3% |
| Vihtavuori N540 | <<locked>> | 82% | 50,009 psi | 90% | 3002 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 49,734 psi | 90% | 3084 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 98% | 49,690 psi | 90% | 3140 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 46,963 psi | 85% | 2995 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 48,341 psi | 87% | 3084 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,076 psi | 78% | 3159 fps | 100% |
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>> | 92% | 38,363 psi | 69% | 2841 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 46,267 psi | 84% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,722 psi | 63% | 2772 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 43,932 psi | 80% | 2923 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,164 psi | 80% | 2949 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,272 psi | 62% | 2789 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,798 psi | 70% | 2930 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,371 psi | 55% | 2694 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,550 psi | 66% | 2877 fps | 95% |
| Alliant Reloder-26 | 46.5 gr | 88% | 35,201 psi | 64% | 2887 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 44,425 psi | 80% | 2959 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 44,454 psi | 80% | 2927 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 44,846 psi | 81% | 2963 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 42,308 psi | 77% | 2959 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,647 psi | 57% | 2677 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 86% | 44,759 psi | 81% | 3041 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 49% | 1785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,180 psi | 84% | 2963 fps | 99.3% |
| IMR 4350 | <<locked>> | 88% | 45,121 psi | 82% | 2959 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,192 psi | 78% | 2900 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 33,649 psi | 61% | 2730 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 46,412 psi | 84% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,247 psi | 69% | 2789 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 41,234 psi | 75% | 2877 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 39,450 psi | 71% | 2864 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 46,485 psi | 84% | 3005 fps | 99.6% |
| Norma MRP | 48.2 gr | 94% | 43,395 psi | 79% | 3058 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 34,780 psi | 63% | 2776 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 46,760 psi | 85% | 3025 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 38,580 psi | 70% | 2877 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,354 psi | 50% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,918 psi | 81% | 2943 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,234 psi | 75% | 2999 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,476 psi | 62% | 2789 fps | 95.3% |
| ReloadSwiss RS 70 | 42.9 gr | 82% | 36,230 psi | 66% | 2854 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 41,669 psi | 75% | 2897 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 44,454 psi | 80% | 2927 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,247 psi | 69% | 2789 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 46,412 psi | 84% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 41,234 psi | 75% | 2877 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,714 psi | 77% | 2949 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,308 psi | 78% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,656 psi | 77% | 2844 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 42,221 psi | 76% | 2900 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 31,241 psi | 57% | 2723 fps | 97.9% |
| Somchem S385 | <<locked>> | 92% | 43,569 psi | 79% | 2953 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 40,205 psi | 73% | 2825 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 36,100 psi | 65% | 2776 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 98% | 45,934 psi | 83% | 2986 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 46,876 psi | 85% | 2949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,752 psi | 65% | 2779 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 31,169 psi | 56% | 2717 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,563 psi | 64% | 2746 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 42,308 psi | 77% | 2959 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,732 psi | 52% | 2720 fps | 95.6% |
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 55 powders for .243 Ackley Improved loaded with the .243 | 90gr | Speer Deep Curl Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,176 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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-26, ReloadSwiss RS 70, Norma MRP rank at the top here: for .243 Ackley Improved with the .243 | 90gr | Speer Deep Curl Soft Point 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.