Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 100gr | Berger BT Target bullet and 61 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 Alliant Reloder-16.
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>> | 98% | 48,849 psi | 88% | 2917 fps | 98.7% |
| Accurate 4350 | <<locked>> | 88% | 47,427 psi | 86% | 2913 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 82% | 47,921 psi | 87% | 2854 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 94% | 48,820 psi | 88% | 2953 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,733 psi | 88% | 2949 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,733 psi | 88% | 2949 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 48,385 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 48,747 psi | 88% | 2982 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 49,052 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,095 psi | 87% | 2940 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 48,660 psi | 88% | 2995 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,994 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,859 psi | 78% | 2907 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 48,559 psi | 88% | 3064 fps | 99.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,572 psi | 86% | 2976 fps | 96.2% |
| Bofors RP3 | <<locked>> | 82% | 48,675 psi | 88% | 2890 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 48,660 psi | 88% | 2995 fps | 96.6% |
| Bofors RP7 | <<locked>> | 86% | 48,530 psi | 88% | 2867 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 49,023 psi | 89% | 2900 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 88% | 49,763 psi | 90% | 2969 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 86% | 49,719 psi | 90% | 2927 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 48,805 psi | 88% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 49,414 psi | 89% | 2995 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,129 psi | 65% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 49,356 psi | 89% | 2900 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 47,268 psi | 86% | 2844 fps | 97.5% |
| IMR 4831 | <<locked>> | 90% | 48,298 psi | 87% | 2913 fps | 99.6% |
| Lovex S065 | <<locked>> | 86% | 47,210 psi | 85% | 2844 fps | 98.6% |
| Lovex S070 | <<locked>> | 88% | 48,327 psi | 87% | 2884 fps | 98% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,424 psi | 79% | 2818 fps | 97.7% |
| Norma 204 | <<locked>> | 90% | 49,559 psi | 90% | 2943 fps | 96.4% |
| Norma MRP | <<locked>> | 96% | 48,008 psi | 87% | 3018 fps | 97.8% |
| Norma URP | <<locked>> | 90% | 49,980 psi | 90% | 2963 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 90% | 48,631 psi | 88% | 2953 fps | 98.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,353 psi | 82% | 2907 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 67% | 1916 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 49,371 psi | 89% | 2887 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 48,849 psi | 88% | 2999 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 47,355 psi | 86% | 2936 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 49,356 psi | 89% | 3018 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 84% | 48,878 psi | 88% | 2887 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 47,297 psi | 86% | 2923 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 86% | 48,530 psi | 88% | 2867 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 47,210 psi | 85% | 2844 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 88% | 48,327 psi | 87% | 2884 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 47,181 psi | 85% | 2890 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 47,152 psi | 85% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 49,763 psi | 90% | 2848 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 46,862 psi | 85% | 2917 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 49,168 psi | 89% | 2887 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 48,718 psi | 88% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 47,964 psi | 87% | 2904 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 84% | 47,021 psi | 85% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 48,588 psi | 88% | 2900 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 98% | 47,239 psi | 85% | 2877 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 88% | 47,877 psi | 87% | 2904 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 96% | 48,225 psi | 87% | 2966 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 47,906 psi | 87% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 49,763 psi | 90% | 2969 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,135 psi | 80% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,776 psi | 86% | 2890 fps | 96.1% |
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>> | 90% | 36,985 psi | 67% | 2680 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 36,085 psi | 65% | 2677 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 80% | 45,034 psi | 81% | 2802 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,484 psi | 82% | 2887 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,774 psi | 83% | 2890 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,774 psi | 83% | 2890 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,484 psi | 82% | 2828 fps | 100% |
| Alliant Reloder-16 | 36.4 gr | 80% | 35,259 psi | 64% | 2684 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,856 psi | 72% | 2818 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,223 psi | 82% | 2881 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,324 psi | 82% | 2930 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,557 psi | 50% | 2484 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,404 psi | 64% | 2720 fps | 95.7% |
| Alliant Reloder-26 | 43.2 gr | 86% | 33,866 psi | 61% | 2726 fps | 96.1% |
| Bofors RP15 | <<locked>> | 98% | 44,657 psi | 81% | 2913 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 45,658 psi | 83% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 45,324 psi | 82% | 2930 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,306 psi | 73% | 2697 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,064 psi | 83% | 2844 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 38,130 psi | 69% | 2726 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 43,671 psi | 79% | 2805 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,866 psi | 59% | 2582 fps | 98% |
| Hodgdon Superformance | <<locked>> | 82% | 39,842 psi | 72% | 2792 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 49% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 40,814 psi | 74% | 2730 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,582 psi | 75% | 2726 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 34,606 psi | 63% | 2625 fps | 96.9% |
| Lovex S065 | <<locked>> | 80% | 39,320 psi | 71% | 2680 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,521 psi | 68% | 2657 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 35,636 psi | 64% | 2648 fps | 95.4% |
| Norma 204 | <<locked>> | 88% | 46,514 psi | 84% | 2887 fps | 95.6% |
| Norma MRP | 43.9 gr | 90% | 39,073 psi | 71% | 2825 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 35,998 psi | 65% | 2674 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 82% | 37,362 psi | 68% | 2717 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 98% | 42,105 psi | 76% | 2838 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 50% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,151 psi | 84% | 2828 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,337 psi | 77% | 2877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,810 psi | 65% | 2694 fps | 96.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,853 psi | 63% | 2690 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 43,004 psi | 78% | 2782 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 92% | 44,309 psi | 80% | 2867 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 40,306 psi | 73% | 2697 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,320 psi | 71% | 2680 fps | 96.9% |
| Shooters World SW4350 | <<locked>> | 80% | 37,521 psi | 68% | 2657 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,034 psi | 80% | 2835 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,237 psi | 80% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,508 psi | 70% | 2621 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,888 psi | 79% | 2858 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 43,410 psi | 79% | 2779 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 32,430 psi | 59% | 2628 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 42,032 psi | 76% | 2785 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 41,437 psi | 75% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,347 psi | 68% | 2674 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 44,324 psi | 80% | 2822 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 36,854 psi | 67% | 2674 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 30,269 psi | 55% | 2566 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,535 psi | 66% | 2641 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,130 psi | 69% | 2726 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,717 psi | 50% | 2572 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,425 psi | 80% | 2828 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 61 powders for .243 Ackley Improved loaded with the .243 | 100gr | Berger BT Target. Alliant Reloder-26 delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,064 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 61 of the 61 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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, Alliant Reloder-16 rank at the top here: for .243 Ackley Improved with the .243 | 100gr | 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.