Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 90gr | Reichenberg HDB Universal bullet and 56 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 ReloadSwiss RS 62.
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% | 49,385 psi | 89% | 2982 fps | 96.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,284 psi | 89% | 3064 fps | 98.1% |
| Accurate 4064 | <<locked>> | 82% | 48,283 psi | 87% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 48,109 psi | 87% | 3071 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 84% | 48,776 psi | 88% | 3015 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 49,371 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 49,574 psi | 90% | 3064 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 49,255 psi | 89% | 3136 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 49,951 psi | 90% | 3166 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,412 psi | 84% | 3091 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,741 psi | 74% | 2982 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 49,298 psi | 89% | 3219 fps | 99.3% |
| Bofors RP3 | <<locked>> | 84% | 49,806 psi | 90% | 3058 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 49,748 psi | 90% | 3028 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 82% | 46,949 psi | 85% | 3005 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 88% | 47,442 psi | 86% | 3064 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 49,472 psi | 90% | 3068 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 47,079 psi | 85% | 3084 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 65% | 1985 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 48,269 psi | 87% | 2999 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 47,311 psi | 86% | 2999 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 48,225 psi | 87% | 3002 fps | 96.8% |
| IMR 4831 | <<locked>> | 92% | 48,979 psi | 89% | 3071 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 48,486 psi | 88% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 48,037 psi | 87% | 2999 fps | 98.1% |
| Lovex S070 | <<locked>> | 90% | 48,892 psi | 88% | 3035 fps | 97.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,886 psi | 74% | 2894 fps | 96% |
| Norma 203B | <<locked>> | 82% | 48,921 psi | 89% | 3051 fps | 99.8% |
| Norma MRP | <<locked>> | 98% | 48,617 psi | 88% | 3166 fps | 97% |
| Norma URP | <<locked>> | 90% | 47,297 psi | 86% | 3058 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 82% | 48,965 psi | 89% | 3064 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 92% | 49,429 psi | 89% | 3107 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 66% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 46,992 psi | 85% | 2979 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 49,574 psi | 90% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 47,993 psi | 87% | 3091 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 46,775 psi | 85% | 3107 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 86% | 49,661 psi | 90% | 3051 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 49,748 psi | 90% | 3028 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 48,037 psi | 87% | 2999 fps | 98.1% |
| Shooters World Precision | <<locked>> | 82% | 48,486 psi | 88% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 48,892 psi | 88% | 3035 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 47,805 psi | 87% | 3048 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 48,196 psi | 87% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 47,587 psi | 86% | 2940 fps | 96.8% |
| Somchem S355 | <<locked>> | 84% | 46,833 psi | 85% | 2989 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 49,371 psi | 89% | 3127 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 48,660 psi | 88% | 3051 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 86% | 47,863 psi | 87% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 49,400 psi | 89% | 3058 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 49,052 psi | 89% | 2982 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 48,834 psi | 88% | 3064 fps | 99% |
| Vihtavuori N555 | <<locked>> | 98% | 48,385 psi | 88% | 3114 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 49,066 psi | 89% | 3028 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 47,442 psi | 86% | 3064 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,858 psi | 76% | 3127 fps | 100% |
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% | 46,238 psi | 84% | 2920 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 40,001 psi | 72% | 2874 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 45,382 psi | 82% | 2943 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,982 psi | 61% | 2753 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 43,221 psi | 78% | 2904 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,424 psi | 79% | 2930 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,383 psi | 84% | 3002 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,649 psi | 61% | 2766 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,884 psi | 69% | 2907 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,660 psi | 54% | 2667 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 98% | 38,087 psi | 69% | 2913 fps | 95.6% |
| Alliant Reloder-26 | 46.7 gr | 90% | 36,927 psi | 67% | 2933 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 43,410 psi | 79% | 2936 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 43,830 psi | 79% | 2907 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 43,859 psi | 79% | 2940 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 84% | 41,379 psi | 75% | 2933 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,995 psi | 56% | 2654 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 86% | 43,714 psi | 79% | 3012 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 49% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,440 psi | 82% | 2943 fps | 99.2% |
| IMR 4350 | <<locked>> | 88% | 44,280 psi | 80% | 2936 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,598 psi | 77% | 2884 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 32,735 psi | 59% | 2703 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 45,310 psi | 82% | 2940 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,565 psi | 68% | 2769 fps | 95.2% |
| Lovex S070 | <<locked>> | 84% | 40,596 psi | 73% | 2858 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 38,319 psi | 69% | 2835 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 45,730 psi | 83% | 2989 fps | 99.5% |
| Norma MRP | <<locked>> | 94% | 42,366 psi | 77% | 3031 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,098 psi | 62% | 2756 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 45,774 psi | 83% | 3005 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 40,335 psi | 73% | 2917 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 50% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,019 psi | 80% | 2920 fps | 96.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,292 psi | 73% | 2976 fps | 100% |
| ReloadSwiss RS 62 | 41.4 gr | 82% | 36,042 psi | 65% | 2828 fps | 95.9% |
| ReloadSwiss RS 70 | 43.2 gr | 84% | 38,203 psi | 69% | 2904 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 40,886 psi | 74% | 2877 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 43,830 psi | 79% | 2907 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,565 psi | 68% | 2769 fps | 95.2% |
| Shooters World Precision | <<locked>> | 80% | 45,310 psi | 82% | 2940 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 40,596 psi | 73% | 2858 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,756 psi | 76% | 2927 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,569 psi | 77% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,829 psi | 76% | 2825 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 41,466 psi | 75% | 2881 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 30,603 psi | 55% | 2700 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 45,440 psi | 82% | 2989 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 39,508 psi | 71% | 2805 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 35,418 psi | 64% | 2756 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 45,905 psi | 83% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,882 psi | 63% | 2753 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 32,518 psi | 59% | 2753 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,838 psi | 63% | 2723 fps | 98% |
| Winchester 760 | <<locked>> | 84% | 41,379 psi | 75% | 2933 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,849 psi | 54% | 2756 fps | 96.3% |
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 56 powders for .243 Ackley Improved loaded with the .243 | 90gr | Reichenberg HDB Universal. Alliant Reloder-26 delivers the highest muzzle velocity at 3,219 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,219 fps. Accurate 3100 gives the best case fill at 100 %, and 56 of the 56 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 90.0 gr projectile in 0.243" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, ReloadSwiss RS 62 rank at the top here: for .243 Ackley Improved with the .243 | 90gr | Reichenberg HDB Universal 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.