Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 109gr | Berger Long Range Hybrid Target bullet and 62 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 3100 | <<locked>> | 96% | 48,240 psi | 87% | 2795 fps | 99.2% |
| Accurate 4350 | <<locked>> | 88% | 50,009 psi | 90% | 2844 fps | 99.9% |
| Accurate High Country | <<locked>> | 94% | 49,269 psi | 89% | 2930 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 82% | 49,951 psi | 90% | 2776 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 47,761 psi | 86% | 2825 fps | 97% |
| ADI AR 2213 | <<locked>> | 96% | 48,950 psi | 89% | 2874 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 48,182 psi | 87% | 2828 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 47,964 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 48,457 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,587 psi | 86% | 2818 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 96% | 48,051 psi | 87% | 2874 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 48,428 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,150 psi | 82% | 2851 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 47,979 psi | 87% | 2940 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 47,036 psi | 85% | 2854 fps | 96.9% |
| Bofors RP5 | <<locked>> | 96% | 48,051 psi | 87% | 2874 fps | 97.3% |
| Bofors RP7 | <<locked>> | 84% | 47,688 psi | 86% | 2743 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 48,747 psi | 88% | 2835 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 84% | 48,776 psi | 88% | 2799 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 48,109 psi | 87% | 2779 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,179 psi | 80% | 2881 fps | 97% |
| Hodgdon Superformance | <<locked>> | 86% | 48,356 psi | 88% | 2864 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 66% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 48,486 psi | 88% | 2776 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,052 psi | 89% | 2766 fps | 98.5% |
| IMR 4831 | <<locked>> | 88% | 47,659 psi | 86% | 2789 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 98% | 49,806 psi | 90% | 2904 fps | 96.2% |
| Lovex S065 | <<locked>> | 86% | 49,487 psi | 90% | 2772 fps | 99.4% |
| Lovex S070 | <<locked>> | 86% | 47,427 psi | 86% | 2759 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,745 psi | 83% | 2753 fps | 98.8% |
| Norma 204 | <<locked>> | 88% | 48,878 psi | 88% | 2822 fps | 97.1% |
| Norma MRP | <<locked>> | 94% | 47,543 psi | 86% | 2897 fps | 98.5% |
| Norma URP | <<locked>> | 88% | 49,182 psi | 89% | 2831 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 88% | 48,153 psi | 87% | 2831 fps | 99.1% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,051 psi | 87% | 2858 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 67% | 1834 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 47,848 psi | 87% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 46,644 psi | 84% | 2808 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,544 psi | 88% | 2890 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,034 psi | 80% | 2874 fps | 98% |
| Rottweil R 903 | <<locked>> | 82% | 48,167 psi | 87% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,661 psi | 90% | 2805 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 94% | 49,980 psi | 90% | 2864 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 84% | 47,688 psi | 86% | 2743 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 49,487 psi | 90% | 2772 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 86% | 47,427 psi | 86% | 2759 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 49,313 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 49,052 psi | 89% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,689 psi | 88% | 2717 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,545 psi | 90% | 2858 fps | 97.6% |
| Somchem S355 | <<locked>> | 82% | 48,385 psi | 88% | 2756 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 48,312 psi | 87% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 47,224 psi | 85% | 2782 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 84% | 49,284 psi | 89% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 47,776 psi | 86% | 2772 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 98% | 49,676 psi | 90% | 2812 fps | 98% |
| Vihtavuori N550 | <<locked>> | 86% | 47,181 psi | 85% | 2779 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 94% | 47,645 psi | 86% | 2841 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 46,978 psi | 85% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 49,081 psi | 89% | 2841 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,847 psi | 85% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,992 psi | 85% | 2772 fps | 96.8% |
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% | 34,301 psi | 62% | 2513 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 38,174 psi | 69% | 2618 fps | 98.6% |
| Accurate High Country | <<locked>> | 92% | 45,774 psi | 83% | 2864 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 46,920 psi | 85% | 2723 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,018 psi | 76% | 2710 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 45,890 psi | 83% | 2815 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,105 psi | 76% | 2710 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,014 psi | 67% | 2625 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,148 psi | 76% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,640 psi | 75% | 2700 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,916 psi | 76% | 2753 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,282 psi | 49% | 2382 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,764 psi | 59% | 2556 fps | 95.7% |
| Alliant Reloder-26 | 40.4 gr | 82% | 31,125 psi | 56% | 2552 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 41,350 psi | 75% | 2740 fps | 95.3% |
| Bofors RP5 | 42.6 gr | 92% | 41,916 psi | 76% | 2753 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,061 psi | 76% | 2631 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,943 psi | 72% | 2661 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 43,033 psi | 78% | 2684 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,679 psi | 63% | 2520 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,495 psi | 75% | 2818 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 39,073 psi | 71% | 2674 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 50% | 1604 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 37,768 psi | 68% | 2559 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,337 psi | 78% | 2657 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 36,535 psi | 66% | 2569 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 46,673 psi | 84% | 2844 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 41,075 psi | 74% | 2612 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 39,320 psi | 71% | 2595 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 33,301 psi | 60% | 2490 fps | 95.5% |
| Norma 204 | <<locked>> | 84% | 42,641 psi | 77% | 2700 fps | 95.4% |
| Norma MRP | 41.1 gr | 86% | 35,911 psi | 65% | 2644 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,942 psi | 69% | 2612 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 80% | 36,767 psi | 67% | 2598 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 94% | 38,667 psi | 70% | 2667 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 50% | 1640 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,802 psi | 81% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,782 psi | 68% | 2635 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,796 psi | 67% | 2644 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,479 psi | 70% | 2740 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 45,150 psi | 82% | 2707 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,615 psi | 84% | 2749 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 88% | 40,727 psi | 74% | 2684 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,061 psi | 76% | 2631 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,075 psi | 74% | 2612 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 80% | 39,320 psi | 71% | 2595 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,282 psi | 84% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,325 psi | 84% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,972 psi | 72% | 2552 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,350 psi | 73% | 2680 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 45,440 psi | 82% | 2703 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,403 psi | 62% | 2572 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,711 psi | 70% | 2612 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 43,395 psi | 79% | 2635 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,349 psi | 71% | 2612 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 38,334 psi | 69% | 2595 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 38,812 psi | 70% | 2615 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 30,153 psi | 55% | 2461 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,435 psi | 70% | 2582 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,248 psi | 73% | 2667 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,105 psi | 44% | 2349 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,857 psi | 74% | 2654 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 62 powders for .243 Ackley Improved loaded with the .243 | 109gr | Berger Long Range Hybrid Target. Winchester StaBALL HD delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,791 fps to 2,982 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 109.0 gr projectile in 0.243" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon Retumbo, 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. Norma MRP, Alliant Reloder-26, Bofors RP5 rank at the top here: for .243 Ackley Improved with the .243 | 109gr | Berger Long Range Hybrid Target 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.