Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 105gr | Nosler Custom Competition bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Norma MRP.
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% | 47,021 psi | 85% | 2822 fps | 98.8% |
| Accurate 4350 | <<locked>> | 88% | 48,936 psi | 89% | 2874 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 82% | 48,921 psi | 89% | 2805 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 94% | 49,951 psi | 90% | 2913 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 49,908 psi | 90% | 2907 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 49,908 psi | 90% | 2907 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 49,501 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 49,792 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 47,065 psi | 85% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 49,269 psi | 89% | 2900 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,601 psi | 84% | 2894 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 47,282 psi | 86% | 2897 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,772 psi | 79% | 2867 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 94% | 46,644 psi | 84% | 2963 fps | 99.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,979 psi | 89% | 2936 fps | 97% |
| Bofors RP3 | <<locked>> | 82% | 49,937 psi | 90% | 2844 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,601 psi | 84% | 2894 fps | 96.6% |
| Bofors RP7 | <<locked>> | 86% | 49,647 psi | 90% | 2825 fps | 98% |
| Hodgdon H414 | <<locked>> | 86% | 47,790 psi | 86% | 2864 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 84% | 47,616 psi | 86% | 2822 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 49,951 psi | 90% | 2861 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 47,282 psi | 86% | 2890 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 66% | 1824 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 47,311 psi | 86% | 2802 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 48,341 psi | 87% | 2802 fps | 98.1% |
| IMR 4831 | <<locked>> | 90% | 49,429 psi | 89% | 2867 fps | 99.9% |
| Lovex S065 | <<locked>> | 86% | 48,341 psi | 87% | 2802 fps | 99.1% |
| Lovex S070 | <<locked>> | 88% | 49,226 psi | 89% | 2838 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,672 psi | 81% | 2779 fps | 98.4% |
| Norma 204 | <<locked>> | 88% | 47,572 psi | 86% | 2844 fps | 96.4% |
| Norma MRP | <<locked>> | 96% | 49,487 psi | 90% | 2982 fps | 98.5% |
| Norma URP | <<locked>> | 88% | 47,892 psi | 87% | 2858 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 90% | 49,850 psi | 90% | 2910 fps | 99.1% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,775 psi | 85% | 2877 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 67% | 1867 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 49,995 psi | 90% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 48,617 psi | 88% | 2894 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 47,152 psi | 85% | 2910 fps | 99.5% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,902 psi | 78% | 2887 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 82% | 47,036 psi | 85% | 2789 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 48,486 psi | 88% | 2884 fps | 97% |
| Rottweil R 907 | <<locked>> | 86% | 49,647 psi | 90% | 2825 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 48,341 psi | 87% | 2802 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 88% | 49,226 psi | 89% | 2838 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 48,095 psi | 87% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 48,080 psi | 87% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 47,572 psi | 86% | 2746 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 48,109 psi | 87% | 2877 fps | 96.9% |
| Somchem S355 | <<locked>> | 82% | 47,268 psi | 86% | 2789 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 47,137 psi | 85% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 49,240 psi | 89% | 2864 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 84% | 48,167 psi | 87% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 49,966 psi | 90% | 2858 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 98% | 48,573 psi | 88% | 2838 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 88% | 48,907 psi | 89% | 2858 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 96% | 49,647 psi | 90% | 2923 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 49,385 psi | 89% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 47,790 psi | 86% | 2864 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,571 psi | 82% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,124 psi | 89% | 2854 fps | 96.9% |
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>> | 88% | 35,795 psi | 65% | 2595 fps | 96% |
| Accurate 4350 | <<locked>> | 80% | 37,130 psi | 67% | 2641 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 45,963 psi | 83% | 2753 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,947 psi | 80% | 2795 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,976 psi | 80% | 2795 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,976 psi | 80% | 2795 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,499 psi | 84% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,114 psi | 65% | 2648 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,988 psi | 74% | 2779 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,468 psi | 79% | 2785 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,714 psi | 79% | 2835 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,556 psi | 48% | 2398 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,113 psi | 62% | 2635 fps | 95.8% |
| Alliant Reloder-26 | 41.6 gr | 84% | 32,387 psi | 59% | 2628 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 43,062 psi | 78% | 2818 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,818 psi | 85% | 2789 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,714 psi | 79% | 2835 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,176 psi | 75% | 2657 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 38,899 psi | 70% | 2684 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,018 psi | 76% | 2710 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,750 psi | 61% | 2543 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 80% | 38,029 psi | 69% | 2694 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 49% | 1631 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 39,276 psi | 71% | 2638 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,438 psi | 77% | 2684 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,549 psi | 64% | 2589 fps | 97.7% |
| Lovex S065 | <<locked>> | 80% | 40,190 psi | 73% | 2638 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 38,392 psi | 69% | 2618 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 34,505 psi | 62% | 2562 fps | 95.5% |
| Norma 204 | <<locked>> | 86% | 44,309 psi | 80% | 2779 fps | 95.5% |
| Norma MRP | 42.3 gr | 88% | 37,420 psi | 68% | 2726 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,941 psi | 67% | 2635 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,824 psi | 65% | 2621 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 40,321 psi | 73% | 2743 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 50% | 1673 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,555 psi | 79% | 2835 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,666 psi | 66% | 2651 fps | 97.6% |
| ReloadSwiss RS 70 | 39.3 gr | 80% | 35,824 psi | 65% | 2661 fps | 96.9% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,958 psi | 72% | 2815 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 44,106 psi | 80% | 2736 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 42,540 psi | 77% | 2769 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 41,176 psi | 75% | 2657 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,190 psi | 73% | 2638 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 80% | 38,392 psi | 69% | 2618 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,165 psi | 82% | 2789 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,411 psi | 82% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,378 psi | 71% | 2582 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,148 psi | 76% | 2762 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 44,411 psi | 80% | 2733 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 33,388 psi | 60% | 2592 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 40,408 psi | 73% | 2690 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 42,380 psi | 77% | 2664 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,334 psi | 69% | 2635 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 39,740 psi | 72% | 2667 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 37,797 psi | 68% | 2635 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,211 psi | 53% | 2477 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,492 psi | 68% | 2605 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,175 psi | 71% | 2690 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,932 psi | 45% | 2415 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,685 psi | 77% | 2733 fps | 95.2% |
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 60 powders for .243 Ackley Improved loaded with the .243 | 105gr | Nosler Custom Competition. Winchester StaBALL HD delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,009 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 60 of the 60 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 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, 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. Alliant Reloder-26, ReloadSwiss RS 70, Norma MRP rank at the top here: for .243 Ackley Improved with the .243 | 105gr | Nosler Custom Competition 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.