Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 100gr | Nosler Partition bullet and 59 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 47,007 psi | 85% | 2887 fps | 98.5% |
| Accurate 4350 | <<locked>> | 88% | 48,965 psi | 89% | 2946 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 82% | 48,718 psi | 88% | 2874 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 92% | 46,702 psi | 85% | 2917 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 49,980 psi | 90% | 2979 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 49,588 psi | 90% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 49,850 psi | 90% | 3005 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 47,065 psi | 85% | 2969 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 49,342 psi | 89% | 2969 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 49,850 psi | 90% | 3022 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 98% | 47,195 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,903 psi | 79% | 2936 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 46,659 psi | 84% | 3031 fps | 99.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,124 psi | 89% | 3009 fps | 96.7% |
| Bofors RP3 | <<locked>> | 82% | 49,879 psi | 90% | 2913 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 49,850 psi | 90% | 3022 fps | 97% |
| Bofors RP7 | <<locked>> | 86% | 49,530 psi | 90% | 2890 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 47,805 psi | 87% | 2936 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 84% | 47,790 psi | 86% | 2897 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 49,908 psi | 90% | 2930 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 47,282 psi | 86% | 2959 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 66% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 47,355 psi | 86% | 2871 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 48,269 psi | 87% | 2871 fps | 97.8% |
| IMR 4831 | <<locked>> | 90% | 49,414 psi | 89% | 2936 fps | 99.8% |
| Lovex S065 | <<locked>> | 86% | 48,254 psi | 87% | 2871 fps | 98.9% |
| Lovex S070 | <<locked>> | 88% | 49,313 psi | 89% | 2910 fps | 98.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,686 psi | 81% | 2848 fps | 98.1% |
| Norma 204 | <<locked>> | 88% | 47,471 psi | 86% | 2910 fps | 96% |
| Norma MRP | <<locked>> | 96% | 49,559 psi | 90% | 3051 fps | 98.3% |
| Norma URP | <<locked>> | 88% | 47,950 psi | 87% | 2930 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 49,937 psi | 90% | 2982 fps | 98.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,601 psi | 84% | 2940 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 67% | 1929 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 46,615 psi | 84% | 2963 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 48,762 psi | 88% | 2966 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 47,239 psi | 85% | 2986 fps | 99.4% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,917 psi | 78% | 2953 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 47,065 psi | 85% | 2861 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 48,602 psi | 88% | 2956 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 86% | 49,530 psi | 90% | 2890 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 48,254 psi | 87% | 2871 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 88% | 49,313 psi | 89% | 2910 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 48,298 psi | 87% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 48,312 psi | 87% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 47,703 psi | 86% | 2815 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 48,167 psi | 87% | 2949 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 47,065 psi | 85% | 2854 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 47,108 psi | 85% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 49,211 psi | 89% | 2933 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 84% | 48,109 psi | 87% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 49,995 psi | 90% | 2930 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 98% | 48,399 psi | 88% | 2904 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 88% | 49,153 psi | 89% | 2930 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 96% | 49,705 psi | 90% | 2995 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 49,400 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 47,805 psi | 87% | 2936 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,818 psi | 83% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,936 psi | 89% | 2920 fps | 96.5% |
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% | 35,824 psi | 65% | 2654 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 36,912 psi | 67% | 2700 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 45,847 psi | 83% | 2822 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 43,888 psi | 79% | 2861 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,918 psi | 79% | 2858 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,369 psi | 84% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,027 psi | 65% | 2710 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,915 psi | 74% | 2844 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,410 psi | 79% | 2851 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,700 psi | 79% | 2900 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,469 psi | 48% | 2451 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,040 psi | 62% | 2690 fps | 95.3% |
| Alliant Reloder-26 | 43.2 gr | 84% | 32,576 psi | 59% | 2694 fps | 95.6% |
| Bofors RP15 | <<locked>> | 96% | 43,091 psi | 78% | 2887 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,514 psi | 84% | 2858 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,700 psi | 79% | 2900 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,046 psi | 74% | 2720 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,885 psi | 70% | 2749 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 44,686 psi | 81% | 2835 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,663 psi | 61% | 2605 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 82% | 40,683 psi | 74% | 2822 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 49% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 39,305 psi | 71% | 2700 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,583 psi | 77% | 2756 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 35,636 psi | 64% | 2654 fps | 97.3% |
| Lovex S065 | <<locked>> | 80% | 40,074 psi | 73% | 2703 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 38,247 psi | 69% | 2677 fps | 95.5% |
| Lovex S071 | <<locked>> | 92% | 34,534 psi | 62% | 2625 fps | 95.1% |
| Norma 204 | <<locked>> | 86% | 44,280 psi | 80% | 2848 fps | 95.1% |
| Norma MRP | 44.9 gr | 90% | 40,205 psi | 73% | 2854 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,796 psi | 67% | 2697 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,781 psi | 65% | 2680 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 43,323 psi | 78% | 2871 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 50% | 1726 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,453 psi | 79% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,840 psi | 67% | 2720 fps | 97.3% |
| ReloadSwiss RS 70 | 40.7 gr | 80% | 35,694 psi | 65% | 2720 fps | 96.5% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,089 psi | 73% | 2881 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 79% | 2802 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 90% | 42,525 psi | 77% | 2831 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,046 psi | 74% | 2720 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,074 psi | 73% | 2703 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 80% | 38,247 psi | 69% | 2677 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,136 psi | 82% | 2858 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,426 psi | 82% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,146 psi | 71% | 2644 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,889 psi | 81% | 2884 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 44,266 psi | 80% | 2802 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 33,257 psi | 60% | 2651 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 40,408 psi | 73% | 2756 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 42,221 psi | 76% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,145 psi | 69% | 2697 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 42,409 psi | 77% | 2789 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 37,826 psi | 68% | 2700 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 29,109 psi | 53% | 2533 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,333 psi | 68% | 2667 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 39,160 psi | 71% | 2753 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,716 psi | 48% | 2539 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,905 psi | 83% | 2864 fps | 95.8% |
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 59 powders for .243 Ackley Improved loaded with the .243 | 100gr | Nosler Partition. Winchester StaBALL HD delivers the highest muzzle velocity at 3,081 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,081 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 59 of the 59 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 100.0 gr projectile in 0.243" calls for a 1:10.0 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, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 100gr | Nosler Partition 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.