Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 107gr | Nosler Custom Competition 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-26, Norma MRP 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 3100 | <<locked>> | 96% | 47,761 psi | 86% | 2808 fps | 99% |
| Accurate 4350 | <<locked>> | 88% | 49,603 psi | 90% | 2861 fps | 99.9% |
| Accurate High Country | <<locked>> | 94% | 48,414 psi | 88% | 2936 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 82% | 49,400 psi | 89% | 2789 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 47,427 psi | 86% | 2841 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,442 psi | 86% | 2838 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,442 psi | 86% | 2838 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 47,282 psi | 86% | 2864 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 47,703 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 49,922 psi | 90% | 2887 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 47,282 psi | 86% | 2884 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 98% | 47,964 psi | 87% | 2884 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,425 psi | 80% | 2858 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 47,427 psi | 86% | 2953 fps | 99.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,690 psi | 90% | 2927 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 47,282 psi | 86% | 2884 fps | 97% |
| Bofors RP7 | <<locked>> | 84% | 47,137 psi | 85% | 2756 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 48,399 psi | 88% | 2854 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 84% | 48,515 psi | 88% | 2815 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 47,398 psi | 86% | 2792 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,511 psi | 79% | 2887 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 86% | 47,935 psi | 87% | 2881 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 66% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 48,211 psi | 87% | 2792 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 48,805 psi | 88% | 2785 fps | 98.3% |
| IMR 4831 | <<locked>> | 88% | 46,992 psi | 85% | 2802 fps | 99.8% |
| Lovex S065 | <<locked>> | 86% | 48,878 psi | 88% | 2785 fps | 99.3% |
| Lovex S070 | <<locked>> | 88% | 49,777 psi | 90% | 2822 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,353 psi | 82% | 2769 fps | 98.6% |
| Norma 204 | <<locked>> | 88% | 48,167 psi | 87% | 2831 fps | 96.7% |
| Norma MRP | <<locked>> | 94% | 46,731 psi | 85% | 2907 fps | 98.2% |
| Norma URP | <<locked>> | 88% | 48,501 psi | 88% | 2844 fps | 99.8% |
| Ramshot Grand | <<locked>> | 98% | 49,226 psi | 89% | 2927 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 88% | 47,413 psi | 86% | 2841 fps | 98.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,195 psi | 85% | 2864 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 67% | 1854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 47,456 psi | 86% | 2877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 49,313 psi | 89% | 2881 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 47,790 psi | 86% | 2900 fps | 99.7% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,613 psi | 79% | 2884 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 47,558 psi | 86% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 48,994 psi | 89% | 2815 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 94% | 49,168 psi | 89% | 2871 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 84% | 47,137 psi | 85% | 2756 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 48,878 psi | 88% | 2785 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 88% | 49,777 psi | 90% | 2822 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 48,646 psi | 88% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 48,863 psi | 88% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,051 psi | 87% | 2730 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 48,762 psi | 88% | 2867 fps | 97.3% |
| Somchem S355 | <<locked>> | 82% | 47,805 psi | 87% | 2772 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 47,848 psi | 87% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 49,908 psi | 90% | 2851 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 84% | 48,718 psi | 88% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 47,471 psi | 86% | 2792 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 98% | 49,240 psi | 89% | 2825 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 88% | 49,893 psi | 90% | 2848 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 94% | 47,224 psi | 85% | 2858 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 46,644 psi | 84% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 48,399 psi | 88% | 2854 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,354 psi | 84% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,835 psi | 90% | 2844 fps | 97.2% |
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>> | 86% | 33,997 psi | 62% | 2530 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 37,637 psi | 68% | 2628 fps | 98.3% |
| Accurate High Country | <<locked>> | 92% | 45,324 psi | 82% | 2877 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,383 psi | 84% | 2736 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 41,713 psi | 75% | 2723 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,800 psi | 76% | 2726 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,800 psi | 76% | 2726 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,550 psi | 66% | 2635 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,568 psi | 75% | 2766 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,336 psi | 75% | 2717 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,568 psi | 75% | 2766 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,905 psi | 49% | 2388 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,503 psi | 59% | 2566 fps | 95.3% |
| Alliant Reloder-26 | 40.5 gr | 82% | 30,632 psi | 55% | 2556 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 43,685 psi | 79% | 2808 fps | 95.8% |
| Bofors RP5 | <<locked>> | 92% | 41,568 psi | 75% | 2766 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,568 psi | 75% | 2641 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 80% | 39,668 psi | 72% | 2677 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,511 psi | 77% | 2697 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,171 psi | 62% | 2533 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,828 psi | 74% | 2822 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 38,522 psi | 70% | 2680 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 49% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 39,740 psi | 72% | 2625 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,163 psi | 78% | 2677 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 36,289 psi | 66% | 2582 fps | 98% |
| Lovex S065 | <<locked>> | 80% | 40,582 psi | 73% | 2625 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 38,841 psi | 70% | 2605 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 32,764 psi | 59% | 2497 fps | 95% |
| Norma 204 | <<locked>> | 84% | 42,076 psi | 76% | 2713 fps | 95% |
| Norma MRP | 42.2 gr | 88% | 37,956 psi | 69% | 2717 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 37,434 psi | 68% | 2625 fps | 98.2% |
| Ramshot Grand | <<locked>> | 96% | 46,006 psi | 83% | 2864 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 36,260 psi | 66% | 2608 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 40,930 psi | 74% | 2736 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 50% | 1654 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,135 psi | 80% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,463 psi | 68% | 2648 fps | 98% |
| ReloadSwiss RS 70 | 39.2 gr | 80% | 36,303 psi | 66% | 2651 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,797 psi | 68% | 2740 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 44,585 psi | 81% | 2720 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,963 psi | 83% | 2756 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 40,422 psi | 73% | 2700 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,568 psi | 75% | 2641 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,582 psi | 73% | 2625 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 80% | 38,841 psi | 70% | 2605 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,716 psi | 83% | 2776 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,832 psi | 83% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,769 psi | 72% | 2569 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,786 psi | 77% | 2753 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 44,889 psi | 81% | 2720 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 33,881 psi | 61% | 2579 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,435 psi | 70% | 2625 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 42,844 psi | 78% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,798 psi | 70% | 2621 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 40,292 psi | 73% | 2657 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 38,290 psi | 69% | 2625 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,660 psi | 54% | 2467 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,927 psi | 69% | 2592 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,668 psi | 72% | 2677 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,266 psi | 46% | 2411 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,279 psi | 78% | 2723 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 62 powders for .243 Ackley Improved loaded with the .243 | 107gr | Nosler Custom Competition. Winchester StaBALL HD delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,811 fps to 2,999 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 62 of the 62 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 107.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, Hodgdon Retumbo 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, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 107gr | Nosler Custom Competition 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.