Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 108gr | Berger Elite Hunter bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Bofors RP5.
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 2700 | <<locked>> | 82% | 47,979 psi | 87% | 2713 fps | 97.7% |
| Accurate 2700 | <<locked>> | 82% | 47,979 psi | 87% | 2713 fps | 97.7% |
| Accurate 3100 | <<locked>> | 96% | 48,312 psi | 87% | 2812 fps | 99.2% |
| Accurate 4350 | <<locked>> | 86% | 46,615 psi | 84% | 2799 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 82% | 49,850 psi | 90% | 2785 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 47,921 psi | 87% | 2841 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 47,805 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 48,269 psi | 87% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,369 psi | 86% | 2831 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 47,819 psi | 87% | 2884 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 48,544 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,889 psi | 81% | 2858 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 48,051 psi | 87% | 2953 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 47,123 psi | 85% | 2867 fps | 96.9% |
| Bofors RP5 | <<locked>> | 96% | 47,819 psi | 87% | 2884 fps | 97.2% |
| Bofors RP7 | <<locked>> | 84% | 47,616 psi | 86% | 2753 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 84% | 49,966 psi | 90% | 2871 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 86% | 47,659 psi | 86% | 2789 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 47,950 psi | 87% | 2792 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,976 psi | 80% | 2887 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 86% | 48,472 psi | 88% | 2881 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 66% | 1801 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 48,907 psi | 89% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 47,964 psi | 87% | 2736 fps | 98.4% |
| IMR 4350 | <<locked>> | 88% | 48,327 psi | 87% | 2785 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,269 psi | 89% | 2785 fps | 98.5% |
| IMR 4831 | <<locked>> | 92% | 48,544 psi | 88% | 2818 fps | 99.9% |
| Lovex S065 | <<locked>> | 86% | 49,342 psi | 89% | 2782 fps | 99.4% |
| Lovex S070 | <<locked>> | 86% | 47,297 psi | 86% | 2766 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,905 psi | 83% | 2769 fps | 98.8% |
| Norma 204 | <<locked>> | 88% | 48,689 psi | 88% | 2831 fps | 97% |
| Norma MRP | <<locked>> | 94% | 47,282 psi | 86% | 2907 fps | 98.4% |
| Norma URP | <<locked>> | 88% | 49,037 psi | 89% | 2841 fps | 99.9% |
| Ramshot Grand | <<locked>> | 94% | 49,400 psi | 89% | 2920 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 88% | 47,935 psi | 87% | 2838 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 98% | 49,995 psi | 90% | 2904 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 67% | 1844 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 47,674 psi | 86% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 49,879 psi | 90% | 2877 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,312 psi | 87% | 2900 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,063 psi | 80% | 2887 fps | 98% |
| Rottweil R 903 | <<locked>> | 82% | 48,109 psi | 87% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,472 psi | 90% | 2815 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 94% | 49,719 psi | 90% | 2874 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 84% | 47,616 psi | 86% | 2753 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 49,342 psi | 89% | 2782 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 86% | 47,297 psi | 86% | 2766 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 49,168 psi | 89% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 48,979 psi | 89% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,515 psi | 88% | 2730 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,284 psi | 89% | 2867 fps | 97.5% |
| Somchem S355 | <<locked>> | 82% | 48,269 psi | 87% | 2769 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 48,457 psi | 88% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 47,340 psi | 86% | 2795 fps | 97.8% |
| Unknown powder | <<locked>> | 86% | 49,443 psi | 89% | 2844 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 49,197 psi | 89% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 47,601 psi | 86% | 2782 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 98% | 49,792 psi | 90% | 2828 fps | 98% |
| Vihtavuori N550 | <<locked>> | 86% | 47,036 psi | 85% | 2789 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 94% | 47,776 psi | 86% | 2854 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 47,123 psi | 85% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 49,966 psi | 90% | 2871 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,891 psi | 85% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 48,182 psi | 87% | 2805 fps | 97% |
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 2700 | <<locked>> | 80% | 45,121 psi | 82% | 2661 fps | 97.1% |
| Accurate 2700 | <<locked>> | 80% | 45,121 psi | 82% | 2661 fps | 97.1% |
| Accurate 3100 | <<locked>> | 86% | 34,200 psi | 62% | 2523 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 38,130 psi | 69% | 2631 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 46,862 psi | 85% | 2733 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,858 psi | 76% | 2717 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,941 psi | 67% | 2635 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,018 psi | 76% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,800 psi | 76% | 2717 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,061 psi | 76% | 2769 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,224 psi | 49% | 2392 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,866 psi | 59% | 2569 fps | 95.7% |
| Alliant Reloder-26 | 40.6 gr | 82% | 30,995 psi | 56% | 2559 fps | 95.8% |
| Bofors RP15 | <<locked>> | 94% | 41,481 psi | 75% | 2753 fps | 95.3% |
| Bofors RP5 | 42.9 gr | 92% | 42,061 psi | 76% | 2769 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 42,018 psi | 76% | 2641 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 80% | 43,366 psi | 78% | 2746 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 82% | 42,032 psi | 76% | 2677 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,606 psi | 63% | 2530 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,263 psi | 75% | 2825 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 38,957 psi | 70% | 2684 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 49% | 1611 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,905 psi | 83% | 2710 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,078 psi | 82% | 2680 fps | 97.8% |
| IMR 4350 | <<locked>> | 80% | 37,681 psi | 68% | 2569 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,265 psi | 78% | 2671 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 33,156 psi | 60% | 2500 fps | 97.2% |
| Lovex S065 | <<locked>> | 80% | 41,002 psi | 74% | 2625 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 39,233 psi | 71% | 2605 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 33,214 psi | 60% | 2500 fps | 95.3% |
| Norma 204 | <<locked>> | 84% | 42,496 psi | 77% | 2710 fps | 95.3% |
| Norma MRP | 41.4 gr | 86% | 35,998 psi | 65% | 2657 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,855 psi | 69% | 2625 fps | 98.4% |
| Ramshot Grand | <<locked>> | 92% | 45,818 psi | 83% | 2851 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 36,680 psi | 66% | 2608 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 92% | 39,885 psi | 72% | 2707 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 50% | 1654 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,643 psi | 81% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,666 psi | 68% | 2641 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,680 psi | 66% | 2651 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,261 psi | 69% | 2746 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 45,107 psi | 82% | 2720 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,441 psi | 84% | 2759 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 40,915 psi | 74% | 2700 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,018 psi | 76% | 2641 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,002 psi | 74% | 2625 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 80% | 39,233 psi | 71% | 2605 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,195 psi | 84% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,282 psi | 84% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,190 psi | 73% | 2569 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,524 psi | 73% | 2697 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 45,353 psi | 82% | 2717 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,316 psi | 62% | 2579 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,899 psi | 70% | 2628 fps | 95.6% |
| Unknown powder | <<locked>> | 80% | 40,756 psi | 74% | 2680 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 43,308 psi | 78% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,247 psi | 71% | 2621 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 40,756 psi | 74% | 2657 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 38,696 psi | 70% | 2621 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,081 psi | 54% | 2470 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,334 psi | 69% | 2592 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 43,366 psi | 78% | 2746 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,556 psi | 46% | 2418 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,872 psi | 76% | 2687 fps | 95.3% |
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 80 powders for .243 Ackley Improved loaded with the .243 | 108gr | Berger Elite Hunter. Winchester StaBALL HD delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,801 fps to 2,999 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 108.0 gr projectile in 0.243" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Norma MRP, Alliant Reloder-26, Bofors RP5 rank at the top here: for .243 Ackley Improved with the .243 | 108gr | Berger Elite Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Accurate MAGPRO, ADI AR 2217 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.