Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 105gr | Berger BT 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 47,645 psi | 86% | 2835 fps | 98.9% |
| Accurate 4350 | <<locked>> | 88% | 49,748 psi | 90% | 2890 fps | 99.9% |
| Accurate High Country | <<locked>> | 94% | 48,617 psi | 88% | 2969 fps | 96% |
| ADI AR 2208 | <<locked>> | 82% | 49,661 psi | 90% | 2825 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 47,427 psi | 86% | 2867 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,805 psi | 87% | 2874 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,805 psi | 87% | 2874 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 47,413 psi | 86% | 2894 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 48,153 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,224 psi | 85% | 2864 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 47,500 psi | 86% | 2913 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 48,254 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,860 psi | 81% | 2894 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 47,616 psi | 86% | 2986 fps | 99.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,879 psi | 90% | 2956 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 47,500 psi | 86% | 2913 fps | 96.9% |
| Bofors RP7 | <<locked>> | 84% | 47,384 psi | 86% | 2789 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 48,472 psi | 88% | 2884 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 84% | 48,660 psi | 88% | 2848 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 47,863 psi | 87% | 2828 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,903 psi | 79% | 2923 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 86% | 47,863 psi | 87% | 2907 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 66% | 1837 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 48,283 psi | 87% | 2825 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,008 psi | 89% | 2818 fps | 98.3% |
| IMR 4831 | <<locked>> | 88% | 47,123 psi | 85% | 2831 fps | 99.7% |
| Lovex S065 | <<locked>> | 86% | 49,052 psi | 89% | 2818 fps | 99.3% |
| Lovex S070 | <<locked>> | 86% | 46,949 psi | 85% | 2799 fps | 98.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,643 psi | 83% | 2802 fps | 98.6% |
| Norma 204 | <<locked>> | 88% | 48,196 psi | 87% | 2861 fps | 96.6% |
| Norma MRP | <<locked>> | 94% | 46,920 psi | 85% | 2940 fps | 98.1% |
| Norma URP | <<locked>> | 88% | 48,950 psi | 89% | 2881 fps | 99.8% |
| Ramshot Grand | <<locked>> | 98% | 49,719 psi | 90% | 2963 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 88% | 47,442 psi | 86% | 2867 fps | 98.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,587 psi | 86% | 2897 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 67% | 1880 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 47,645 psi | 86% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 49,676 psi | 90% | 2913 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,095 psi | 87% | 2933 fps | 99.7% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,845 psi | 79% | 2917 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 47,819 psi | 87% | 2805 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,342 psi | 89% | 2848 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 94% | 49,501 psi | 90% | 2907 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 84% | 47,384 psi | 86% | 2789 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 49,052 psi | 89% | 2818 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 86% | 46,949 psi | 85% | 2799 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 48,820 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 48,878 psi | 88% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,559 psi | 88% | 2769 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,066 psi | 89% | 2900 fps | 97.2% |
| Somchem S355 | <<locked>> | 82% | 48,066 psi | 87% | 2805 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 47,950 psi | 87% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 46,804 psi | 85% | 2825 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 84% | 48,921 psi | 89% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 47,587 psi | 86% | 2822 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 98% | 49,443 psi | 89% | 2858 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 88% | 49,922 psi | 90% | 2877 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 94% | 47,210 psi | 85% | 2884 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 49,937 psi | 90% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 48,849 psi | 88% | 2890 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,427 psi | 84% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 50,009 psi | 90% | 2874 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% | 34,113 psi | 62% | 2556 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 37,898 psi | 69% | 2661 fps | 98.3% |
| Accurate High Country | <<locked>> | 92% | 45,252 psi | 82% | 2904 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 46,702 psi | 85% | 2772 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,541 psi | 81% | 2812 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,872 psi | 76% | 2753 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,872 psi | 76% | 2753 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,782 psi | 67% | 2667 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,713 psi | 75% | 2799 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,408 psi | 75% | 2746 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,553 psi | 75% | 2792 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,890 psi | 49% | 2411 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,547 psi | 59% | 2592 fps | 95.2% |
| Alliant Reloder-26 | 41.3 gr | 82% | 30,922 psi | 56% | 2589 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 43,961 psi | 80% | 2841 fps | 95.8% |
| Bofors RP5 | <<locked>> | 92% | 41,553 psi | 75% | 2792 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 41,858 psi | 76% | 2677 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 80% | 39,595 psi | 72% | 2700 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 42,714 psi | 77% | 2730 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,200 psi | 62% | 2556 fps | 98.8% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,017 psi | 74% | 2854 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 38,566 psi | 70% | 2710 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 49% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 39,929 psi | 72% | 2654 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,134 psi | 78% | 2703 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 36,289 psi | 66% | 2608 fps | 97.9% |
| Lovex S065 | <<locked>> | 80% | 40,611 psi | 73% | 2654 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 38,827 psi | 70% | 2631 fps | 96.2% |
| Lovex S071 | <<locked>> | 92% | 35,143 psi | 64% | 2579 fps | 95.8% |
| Norma 204 | <<locked>> | 86% | 45,266 psi | 82% | 2805 fps | 95.9% |
| Norma MRP | 43 gr | 88% | 38,247 psi | 69% | 2746 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 37,405 psi | 68% | 2651 fps | 98.1% |
| Ramshot Grand | <<locked>> | 96% | 46,180 psi | 84% | 2894 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 36,419 psi | 66% | 2638 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 41,046 psi | 74% | 2766 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,833 psi | 50% | 1683 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,338 psi | 80% | 2851 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,376 psi | 68% | 2671 fps | 97.9% |
| ReloadSwiss RS 70 | 39.9 gr | 80% | 36,419 psi | 66% | 2680 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,116 psi | 69% | 2776 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 44,556 psi | 81% | 2749 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,035 psi | 83% | 2785 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 43,207 psi | 78% | 2785 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 41,858 psi | 76% | 2677 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,611 psi | 73% | 2654 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 80% | 38,827 psi | 70% | 2631 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,919 psi | 83% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,876 psi | 83% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,740 psi | 72% | 2595 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,815 psi | 77% | 2779 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 44,875 psi | 81% | 2746 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,127 psi | 62% | 2612 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,537 psi | 70% | 2654 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 42,830 psi | 78% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,030 psi | 71% | 2654 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 40,567 psi | 73% | 2690 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 38,493 psi | 70% | 2654 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 29,689 psi | 54% | 2490 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,043 psi | 69% | 2621 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,885 psi | 72% | 2707 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,367 psi | 46% | 2438 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,584 psi | 79% | 2756 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 | 105gr | Berger BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,028 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 105.0 gr projectile in 0.243" calls for a 1:9.0 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 | 105gr | Berger BT 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.