Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 90gr | Sierra Tipped GameKing 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, Alliant Reloder-16 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 2495 | <<locked>> | 82% | 49,835 psi | 90% | 2972 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,196 psi | 87% | 2953 fps | 95.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,863 psi | 87% | 3031 fps | 97.7% |
| Accurate 4064 | <<locked>> | 82% | 47,065 psi | 85% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 49,951 psi | 90% | 3100 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 84% | 47,790 psi | 86% | 2992 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 49,052 psi | 89% | 3156 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 47,979 psi | 87% | 3015 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 48,196 psi | 87% | 3031 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 48,008 psi | 87% | 3107 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 48,718 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,063 psi | 82% | 3058 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 47,601 psi | 86% | 3182 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 48,399 psi | 88% | 3028 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 48,559 psi | 88% | 2999 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 84% | 48,907 psi | 89% | 3035 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 90% | 49,226 psi | 89% | 3094 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 47,863 psi | 87% | 3035 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 49,705 psi | 90% | 3084 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 49,095 psi | 89% | 3120 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 65% | 1972 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 47,224 psi | 85% | 2972 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 82% | 49,792 psi | 90% | 2999 fps | 97.1% |
| IMR 4350 | <<locked>> | 92% | 49,110 psi | 89% | 3028 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 47,079 psi | 85% | 2972 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 47,703 psi | 86% | 3041 fps | 99% |
| IMR 4895 | <<locked>> | 82% | 49,443 psi | 89% | 3068 fps | 99.8% |
| Lovex S062 | <<locked>> | 82% | 47,398 psi | 86% | 2972 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 47,152 psi | 85% | 2976 fps | 97.8% |
| Lovex S070 | <<locked>> | 90% | 47,747 psi | 86% | 3005 fps | 96.9% |
| Norma 203B | <<locked>> | 82% | 47,514 psi | 86% | 3018 fps | 99.6% |
| Norma MRP | <<locked>> | 98% | 47,326 psi | 86% | 3136 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 49,414 psi | 89% | 3091 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 82% | 47,674 psi | 86% | 3038 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 92% | 47,964 psi | 87% | 3077 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 66% | 2018 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 49,327 psi | 89% | 3018 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 48,327 psi | 87% | 3140 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 49,908 psi | 90% | 3120 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 49,052 psi | 89% | 3146 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 49,095 psi | 89% | 2986 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 48,602 psi | 88% | 3025 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 48,559 psi | 88% | 2999 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 47,152 psi | 85% | 2976 fps | 97.8% |
| Shooters World Precision | <<locked>> | 82% | 47,398 psi | 86% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 47,747 psi | 86% | 3005 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 49,835 psi | 90% | 3084 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 47,181 psi | 85% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 49,748 psi | 90% | 2972 fps | 97.1% |
| Somchem S355 | <<locked>> | 86% | 48,762 psi | 88% | 3022 fps | 99.8% |
| Somchem S365 | <<locked>> | 94% | 47,688 psi | 86% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 47,268 psi | 86% | 3018 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 82% | 49,081 psi | 89% | 2959 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 49,603 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 49,966 psi | 90% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 48,153 psi | 87% | 3031 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 48,095 psi | 87% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 47,340 psi | 86% | 3028 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 98% | 47,094 psi | 85% | 3087 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 47,790 psi | 86% | 2999 fps | 99.9% |
| Winchester 760 | <<locked>> | 90% | 49,226 psi | 89% | 3094 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,422 psi | 73% | 3081 fps | 99.9% |
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 2495 | <<locked>> | 80% | 46,760 psi | 85% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,063 psi | 82% | 2887 fps | 95% |
| Accurate 3100 | <<locked>> | 94% | 38,899 psi | 70% | 2848 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 44,237 psi | 80% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,244 psi | 64% | 2785 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 42,235 psi | 76% | 2877 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,716 psi | 83% | 3084 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,366 psi | 77% | 2904 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,281 psi | 82% | 2976 fps | 99% |
| Alliant Reloder-16 | 37.6 gr | 82% | 34,911 psi | 63% | 2799 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,753 psi | 67% | 2871 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,792 psi | 56% | 2700 fps | 95.8% |
| Alliant Reloder-26 | 45.6 gr | 90% | 35,752 psi | 65% | 2897 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 42,322 psi | 77% | 2910 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,658 psi | 83% | 2940 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 42,902 psi | 78% | 2913 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 43,134 psi | 78% | 2969 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,327 psi | 55% | 2631 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,702 psi | 85% | 3028 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 45,788 psi | 83% | 3051 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 48% | 1762 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,396 psi | 80% | 2917 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,876 psi | 85% | 2943 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 46,209 psi | 84% | 2972 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,338 psi | 80% | 2917 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 34,200 psi | 62% | 2740 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 46,456 psi | 84% | 3009 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 44,570 psi | 81% | 2920 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 39,015 psi | 71% | 2799 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 42,250 psi | 76% | 2890 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 44,672 psi | 81% | 2959 fps | 99.2% |
| Norma MRP | <<locked>> | 96% | 44,106 psi | 80% | 3064 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 35,389 psi | 64% | 2785 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,498 psi | 81% | 2976 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 39,276 psi | 71% | 2887 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 49% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,120 psi | 78% | 2894 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,088 psi | 71% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,143 psi | 64% | 2805 fps | 95.4% |
| ReloadSwiss RS 70 | 42.1 gr | 84% | 36,985 psi | 67% | 2867 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 46,180 psi | 84% | 2933 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,885 psi | 72% | 2851 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 45,658 psi | 83% | 2940 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,015 psi | 71% | 2799 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 44,570 psi | 81% | 2920 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 42,250 psi | 76% | 2890 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,770 psi | 74% | 2900 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,539 psi | 75% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,656 psi | 79% | 2854 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 40,422 psi | 73% | 2854 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,733 psi | 54% | 2671 fps | 97.1% |
| Somchem S385 | <<locked>> | 94% | 44,382 psi | 80% | 2963 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 46,006 psi | 83% | 2907 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,630 psi | 84% | 2920 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,537 psi | 70% | 2782 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 34,490 psi | 62% | 2730 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 44,962 psi | 81% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,448 psi | 66% | 2792 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 33,475 psi | 61% | 2779 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,156 psi | 62% | 2703 fps | 97.6% |
| Winchester 760 | <<locked>> | 86% | 43,134 psi | 78% | 2969 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,095 psi | 53% | 2720 fps | 95.4% |
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 | 90gr | Sierra Tipped GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,182 fps. Accurate 3100 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 65–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 90gr | Sierra Tipped GameKing 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.