Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 108gr | Berger BT 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 2700 | <<locked>> | 82% | 48,602 psi | 88% | 2730 fps | 97.9% |
| Accurate 3100 | <<locked>> | 96% | 49,008 psi | 89% | 2825 fps | 99.3% |
| Accurate 4350 | <<locked>> | 86% | 47,384 psi | 86% | 2815 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 92% | 48,544 psi | 88% | 2858 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 96% | 49,632 psi | 90% | 2904 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 48,617 psi | 88% | 2854 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 48,530 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 49,052 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 48,022 psi | 87% | 2844 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 48,776 psi | 88% | 2904 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 49,240 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,774 psi | 83% | 2877 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 48,704 psi | 88% | 2966 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 47,747 psi | 86% | 2884 fps | 97.1% |
| Bofors RP5 | <<locked>> | 96% | 48,776 psi | 88% | 2904 fps | 97.5% |
| Bofors RP7 | <<locked>> | 84% | 47,950 psi | 87% | 2762 fps | 98% |
| Hodgdon H414 | <<locked>> | 82% | 46,920 psi | 85% | 2818 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 86% | 48,037 psi | 87% | 2799 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 48,689 psi | 88% | 2805 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,759 psi | 81% | 2913 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 86% | 49,110 psi | 89% | 2894 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 66% | 1808 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 49,385 psi | 89% | 2772 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 48,341 psi | 87% | 2746 fps | 98.5% |
| IMR 4350 | <<locked>> | 88% | 48,994 psi | 89% | 2802 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,603 psi | 90% | 2795 fps | 98.6% |
| IMR 4831 | <<locked>> | 92% | 49,269 psi | 89% | 2831 fps | 99.9% |
| Lovex S065 | <<locked>> | 86% | 49,705 psi | 90% | 2792 fps | 99.5% |
| Lovex S070 | <<locked>> | 86% | 47,979 psi | 87% | 2785 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,543 psi | 84% | 2782 fps | 99% |
| Norma 204 | <<locked>> | 88% | 49,356 psi | 89% | 2848 fps | 97.2% |
| Norma MRP | <<locked>> | 94% | 47,892 psi | 87% | 2920 fps | 98.6% |
| Norma URP | <<locked>> | 88% | 49,777 psi | 90% | 2858 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 88% | 48,602 psi | 88% | 2854 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 96% | 47,181 psi | 85% | 2858 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 67% | 1854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 48,443 psi | 88% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 47,137 psi | 85% | 2831 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,950 psi | 89% | 2913 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,788 psi | 81% | 2907 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 82% | 48,515 psi | 88% | 2782 fps | 100% |
| Rottweil R 905 | <<locked>> | 92% | 47,282 psi | 86% | 2831 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 84% | 47,950 psi | 87% | 2762 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 49,705 psi | 90% | 2792 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 86% | 47,979 psi | 87% | 2785 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 49,908 psi | 90% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 49,763 psi | 90% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 49,182 psi | 89% | 2746 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,966 psi | 90% | 2881 fps | 97.7% |
| Somchem S355 | <<locked>> | 82% | 48,733 psi | 88% | 2779 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 48,892 psi | 88% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 47,979 psi | 87% | 2812 fps | 98% |
| Unknown powder | <<locked>> | 84% | 47,108 psi | 85% | 2805 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 49,603 psi | 90% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 48,356 psi | 88% | 2799 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 96% | 47,253 psi | 86% | 2785 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 86% | 47,703 psi | 86% | 2802 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 94% | 48,530 psi | 88% | 2871 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 47,732 psi | 86% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 46,920 psi | 85% | 2818 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,718 psi | 86% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 48,747 psi | 88% | 2818 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 2700 | <<locked>> | 80% | 45,455 psi | 82% | 2674 fps | 97.3% |
| Accurate 3100 | <<locked>> | 84% | 32,590 psi | 59% | 2487 fps | 95.1% |
| Accurate 4350 | <<locked>> | 80% | 38,537 psi | 70% | 2641 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 42,496 psi | 77% | 2736 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 46,238 psi | 84% | 2838 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,583 psi | 77% | 2736 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,362 psi | 68% | 2648 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,438 psi | 77% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,119 psi | 76% | 2726 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,670 psi | 77% | 2785 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,543 psi | 50% | 2405 fps | 96.7% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,141 psi | 60% | 2579 fps | 95.9% |
| Alliant Reloder-26 | 41.1 gr | 82% | 31,546 psi | 57% | 2579 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 42,076 psi | 76% | 2769 fps | 95.6% |
| Bofors RP5 | 43.4 gr | 92% | 42,670 psi | 77% | 2785 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 42,366 psi | 77% | 2654 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 80% | 44,063 psi | 80% | 2762 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 39,856 psi | 72% | 2635 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,027 psi | 63% | 2543 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,276 psi | 71% | 2779 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 39,494 psi | 71% | 2700 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 50% | 1621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,398 psi | 84% | 2720 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,469 psi | 82% | 2694 fps | 98% |
| IMR 4350 | <<locked>> | 80% | 38,058 psi | 69% | 2582 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,947 psi | 80% | 2687 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 33,576 psi | 61% | 2510 fps | 97.4% |
| Lovex S065 | <<locked>> | 80% | 41,379 psi | 75% | 2635 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 39,624 psi | 72% | 2618 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 33,794 psi | 61% | 2516 fps | 95.7% |
| Norma 204 | <<locked>> | 84% | 42,859 psi | 78% | 2720 fps | 95.5% |
| Norma MRP | 41.8 gr | 86% | 36,318 psi | 66% | 2671 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,290 psi | 69% | 2635 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,028 psi | 67% | 2618 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 92% | 40,379 psi | 73% | 2720 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 50% | 1657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,078 psi | 82% | 2828 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,348 psi | 69% | 2661 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,985 psi | 67% | 2661 fps | 97.8% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,899 psi | 70% | 2766 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 45,542 psi | 82% | 2730 fps | 100% |
| Rottweil R 905 | <<locked>> | 88% | 41,234 psi | 75% | 2710 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 42,366 psi | 77% | 2654 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,379 psi | 75% | 2635 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 80% | 39,624 psi | 72% | 2618 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,630 psi | 84% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,702 psi | 85% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,553 psi | 73% | 2582 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,857 psi | 74% | 2703 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 45,788 psi | 83% | 2726 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,751 psi | 63% | 2592 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 39,218 psi | 71% | 2638 fps | 95.8% |
| Unknown powder | <<locked>> | 80% | 41,191 psi | 75% | 2690 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 80% | 43,700 psi | 79% | 2654 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,682 psi | 72% | 2635 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 38,783 psi | 70% | 2618 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 39,088 psi | 71% | 2635 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,487 psi | 55% | 2480 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,653 psi | 70% | 2598 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 44,063 psi | 80% | 2762 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,279 psi | 44% | 2369 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,453 psi | 77% | 2703 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 | 108gr | Berger BT Target. Winchester StaBALL HD delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,012 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 108.0 gr projectile in 0.243" calls for a 1:8.5 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 | 108gr | Berger BT 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.