Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 95gr | Hornady SST bullet and 57 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% | 47,224 psi | 85% | 2953 fps | 98.1% |
| Accurate 4064 | <<locked>> | 82% | 49,327 psi | 89% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 49,617 psi | 90% | 3025 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 84% | 49,719 psi | 90% | 2956 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 47,123 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 47,253 psi | 86% | 3022 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 48,008 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,718 psi | 86% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,568 psi | 75% | 2936 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 47,094 psi | 85% | 3104 fps | 99.3% |
| Bofors RP3 | <<locked>> | 82% | 47,601 psi | 86% | 2943 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 47,558 psi | 86% | 2913 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 82% | 48,037 psi | 87% | 2949 fps | 99% |
| Hodgdon H414 | <<locked>> | 88% | 48,443 psi | 88% | 3012 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 86% | 48,631 psi | 88% | 2972 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 47,485 psi | 86% | 2956 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 47,950 psi | 87% | 3031 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,230 psi | 66% | 1926 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 49,182 psi | 89% | 2940 fps | 99.8% |
| IMR 4350 | <<locked>> | 90% | 48,196 psi | 87% | 2946 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 49,269 psi | 89% | 2949 fps | 97.5% |
| IMR 4831 | <<locked>> | 90% | 47,079 psi | 85% | 2959 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 49,443 psi | 89% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 49,139 psi | 89% | 2946 fps | 98.6% |
| Lovex S070 | <<locked>> | 88% | 47,224 psi | 85% | 2930 fps | 97.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,032 psi | 76% | 2851 fps | 96.9% |
| Norma 203B | <<locked>> | 82% | 49,966 psi | 90% | 2992 fps | 99.9% |
| Norma MRP | <<locked>> | 96% | 46,731 psi | 85% | 3058 fps | 97% |
| Norma URP | <<locked>> | 90% | 48,689 psi | 88% | 3009 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 47,297 psi | 86% | 2995 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,825 psi | 67% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 48,051 psi | 87% | 2930 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 47,572 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 49,327 psi | 89% | 3041 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 47,950 psi | 87% | 3058 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 84% | 47,790 psi | 86% | 2940 fps | 100% |
| Rottweil R 905 | <<locked>> | 96% | 49,269 psi | 89% | 3028 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 86% | 47,558 psi | 86% | 2913 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 49,139 psi | 89% | 2946 fps | 98.6% |
| Shooters World Precision | <<locked>> | 82% | 49,443 psi | 89% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 47,224 psi | 85% | 2930 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 49,023 psi | 89% | 2995 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 49,052 psi | 89% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 48,689 psi | 88% | 2894 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 48,820 psi | 88% | 3022 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 47,834 psi | 87% | 2936 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 47,514 psi | 86% | 3015 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 49,893 psi | 90% | 3005 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 86% | 49,008 psi | 89% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 47,355 psi | 86% | 2946 fps | 99.2% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,153 psi | 89% | 2976 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 90% | 49,922 psi | 90% | 3009 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 98% | 49,763 psi | 90% | 3064 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 46,949 psi | 85% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 48,443 psi | 88% | 3012 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,873 psi | 78% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 49,806 psi | 90% | 2992 fps | 96% |
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% | 38,522 psi | 70% | 2776 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 46,354 psi | 84% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,896 psi | 63% | 2710 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 80% | 44,005 psi | 80% | 2848 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,295 psi | 80% | 2874 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,316 psi | 62% | 2720 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,885 psi | 70% | 2861 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,413 psi | 51% | 2566 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,811 psi | 67% | 2815 fps | 95.7% |
| Alliant Reloder-26 | 44.8 gr | 88% | 35,172 psi | 64% | 2822 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 44,367 psi | 80% | 2881 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 41,814 psi | 76% | 2792 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 44,802 psi | 81% | 2887 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 39,624 psi | 72% | 2825 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 45,440 psi | 82% | 2907 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,923 psi | 58% | 2615 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 84% | 41,524 psi | 75% | 2894 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 49% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,267 psi | 84% | 2887 fps | 99.5% |
| IMR 4350 | <<locked>> | 86% | 42,438 psi | 77% | 2828 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,872 psi | 74% | 2776 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 33,823 psi | 61% | 2667 fps | 96.1% |
| Lovex S062 | <<locked>> | 80% | 46,485 psi | 84% | 2887 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,319 psi | 69% | 2720 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 38,827 psi | 70% | 2749 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 36,869 psi | 67% | 2736 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 46,688 psi | 84% | 2930 fps | 99.7% |
| Norma MRP | 45.5 gr | 92% | 40,640 psi | 74% | 2923 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,911 psi | 63% | 2710 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 84% | 38,769 psi | 70% | 2812 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,354 psi | 50% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,962 psi | 81% | 2871 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,350 psi | 75% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,577 psi | 63% | 2723 fps | 95.8% |
| ReloadSwiss RS 70 | 41.4 gr | 82% | 36,434 psi | 66% | 2792 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 41,814 psi | 76% | 2825 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 94% | 45,919 psi | 83% | 2963 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 41,814 psi | 76% | 2792 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,319 psi | 69% | 2720 fps | 96.1% |
| Shooters World Precision | <<locked>> | 80% | 46,485 psi | 84% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,827 psi | 70% | 2749 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,047 psi | 78% | 2881 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,569 psi | 79% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,885 psi | 72% | 2713 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,498 psi | 82% | 2956 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 42,322 psi | 77% | 2825 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 31,401 psi | 57% | 2661 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 43,772 psi | 79% | 2887 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 40,335 psi | 73% | 2753 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 36,274 psi | 66% | 2710 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 45,759 psi | 83% | 2913 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 35,752 psi | 65% | 2710 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 31,198 psi | 56% | 2651 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,679 psi | 65% | 2684 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 39,624 psi | 72% | 2825 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,834 psi | 52% | 2664 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,325 psi | 84% | 2927 fps | 95.1% |
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 57 powders for .243 Ackley Improved loaded with the .243 | 95gr | Hornady SST. Alliant Reloder-26 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,104 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 57 of the 57 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 95.0 gr projectile in 0.243" calls for a 1:9.5 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 | 95gr | Hornady SST 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.