Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 95gr | Sierra MatchKing 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, 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 2700 | <<locked>> | 82% | 49,792 psi | 90% | 2917 fps | 96.8% |
| Accurate 3100 | <<locked>> | 98% | 46,572 psi | 84% | 2943 fps | 97.9% |
| Accurate 4064 | <<locked>> | 82% | 48,834 psi | 88% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 48,878 psi | 88% | 3009 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 84% | 49,342 psi | 89% | 2946 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 49,705 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 49,864 psi | 90% | 2992 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 49,937 psi | 90% | 3074 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 47,326 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 49,545 psi | 90% | 3031 fps | 96% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,951 psi | 90% | 3084 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,818 psi | 85% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,075 psi | 74% | 2923 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 46,528 psi | 84% | 3094 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 46,847 psi | 85% | 2927 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,951 psi | 90% | 3084 fps | 96.3% |
| Bofors RP7 | <<locked>> | 86% | 46,920 psi | 85% | 2897 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 82% | 47,659 psi | 86% | 2940 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 88% | 47,819 psi | 87% | 2999 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 86% | 47,993 psi | 87% | 2956 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 49,937 psi | 90% | 2995 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 47,413 psi | 86% | 3018 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,129 psi | 65% | 1923 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 48,776 psi | 88% | 2930 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 47,601 psi | 86% | 2930 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 48,602 psi | 88% | 2936 fps | 97.3% |
| IMR 4831 | <<locked>> | 92% | 49,385 psi | 89% | 3002 fps | 99.5% |
| Lovex S062 | <<locked>> | 82% | 48,994 psi | 89% | 2930 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 48,472 psi | 88% | 2933 fps | 98.5% |
| Lovex S070 | <<locked>> | 90% | 49,530 psi | 90% | 2969 fps | 97.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,452 psi | 75% | 2838 fps | 96.7% |
| Norma 203B | <<locked>> | 82% | 49,211 psi | 89% | 2976 fps | 99.9% |
| Norma MRP | <<locked>> | 98% | 49,240 psi | 89% | 3107 fps | 97.6% |
| Norma URP | <<locked>> | 90% | 47,964 psi | 87% | 2995 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 82% | 49,545 psi | 90% | 2999 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 92% | 49,980 psi | 90% | 3045 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 66% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 47,732 psi | 86% | 2920 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 46,891 psi | 85% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 48,602 psi | 88% | 3025 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 47,369 psi | 86% | 3045 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 47,036 psi | 85% | 2927 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 96% | 48,298 psi | 87% | 3009 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 86% | 46,920 psi | 85% | 2897 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 48,472 psi | 88% | 2933 fps | 98.5% |
| Shooters World Precision | <<locked>> | 82% | 48,994 psi | 89% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 49,530 psi | 90% | 2969 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 48,341 psi | 87% | 2982 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 48,675 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 48,051 psi | 87% | 2877 fps | 97.3% |
| Somchem S355 | <<locked>> | 84% | 47,485 psi | 86% | 2927 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 50,009 psi | 90% | 3058 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 49,313 psi | 89% | 2992 fps | 97% |
| Vihtavuori N150 | <<locked>> | 86% | 48,602 psi | 88% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 46,673 psi | 84% | 2933 fps | 99% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,559 psi | 88% | 2963 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 82% | 49,734 psi | 90% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 49,284 psi | 89% | 2995 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 98% | 49,081 psi | 89% | 3051 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 49,647 psi | 90% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 48,138 psi | 87% | 3002 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,366 psi | 77% | 3068 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% | 46,572 psi | 84% | 2854 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 37,927 psi | 69% | 2759 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,905 psi | 83% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,476 psi | 62% | 2700 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 80% | 43,584 psi | 79% | 2835 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,874 psi | 79% | 2864 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,876 psi | 85% | 2933 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,982 psi | 61% | 2710 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,261 psi | 69% | 2844 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,209 psi | 84% | 2966 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,514 psi | 84% | 3018 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,137 psi | 51% | 2556 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,129 psi | 65% | 2795 fps | 95.3% |
| Alliant Reloder-26 | 44.3 gr | 88% | 34,664 psi | 63% | 2805 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 43,961 psi | 80% | 2874 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 46,514 psi | 84% | 3018 fps | 95.4% |
| Bofors RP7 | <<locked>> | 84% | 44,106 psi | 80% | 2841 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 44,411 psi | 80% | 2877 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,858 psi | 76% | 2874 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 45,107 psi | 82% | 2897 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,531 psi | 57% | 2605 fps | 97% |
| Hodgdon Superformance | <<locked>> | 86% | 44,251 psi | 80% | 2953 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 49% | 1716 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,832 psi | 83% | 2874 fps | 99.4% |
| IMR 4350 | <<locked>> | 86% | 42,105 psi | 76% | 2818 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,248 psi | 73% | 2759 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 33,170 psi | 60% | 2651 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 46,064 psi | 83% | 2877 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,971 psi | 69% | 2710 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,944 psi | 74% | 2799 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 38,783 psi | 70% | 2782 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 46,253 psi | 84% | 2920 fps | 99.7% |
| Norma MRP | 46 gr | 94% | 43,033 psi | 78% | 2976 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,534 psi | 62% | 2700 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 46,195 psi | 84% | 2936 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 38,189 psi | 69% | 2795 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 50% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,614 psi | 81% | 2858 fps | 97% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,683 psi | 74% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,214 psi | 62% | 2713 fps | 95.7% |
| ReloadSwiss RS 70 | 40.9 gr | 82% | 35,911 psi | 65% | 2776 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 41,423 psi | 75% | 2815 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 94% | 45,295 psi | 82% | 2949 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 44,106 psi | 80% | 2841 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,971 psi | 69% | 2710 fps | 95.9% |
| Shooters World Precision | <<locked>> | 80% | 46,064 psi | 83% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,944 psi | 74% | 2799 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,366 psi | 77% | 2864 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,844 psi | 78% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,581 psi | 72% | 2707 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 41,916 psi | 76% | 2815 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 31,024 psi | 56% | 2648 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 43,192 psi | 78% | 2874 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 39,943 psi | 72% | 2746 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,897 psi | 65% | 2700 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 45,237 psi | 82% | 2900 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 46,485 psi | 84% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,389 psi | 64% | 2697 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 30,777 psi | 56% | 2641 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,172 psi | 64% | 2667 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 41,858 psi | 76% | 2874 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,398 psi | 51% | 2648 fps | 96% |
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 | 95gr | Sierra MatchKing. Norma MRP delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,107 fps. Alliant Reloder-22 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 95.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, 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, Norma MRP rank at the top here: for .243 Ackley Improved with the .243 | 95gr | Sierra MatchKing 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.