Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 90gr | Lapua ScenarL 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, 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 2700 | <<locked>> | 82% | 48,602 psi | 88% | 2963 fps | 96% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,559 psi | 88% | 3048 fps | 97.9% |
| Accurate 4064 | <<locked>> | 82% | 47,587 psi | 86% | 2979 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 47,210 psi | 85% | 3051 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 84% | 48,225 psi | 87% | 2999 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 49,850 psi | 90% | 3173 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 48,428 psi | 88% | 3025 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 48,660 psi | 88% | 3041 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 48,791 psi | 88% | 3127 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 49,124 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,730 psi | 83% | 3074 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,885 psi | 72% | 2956 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 48,588 psi | 88% | 3202 fps | 99.2% |
| Bofors RP3 | <<locked>> | 84% | 48,892 psi | 88% | 3041 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 48,950 psi | 89% | 3009 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 84% | 49,719 psi | 90% | 3051 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 90% | 49,966 psi | 90% | 3110 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 88% | 49,922 psi | 90% | 3064 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 48,631 psi | 88% | 3048 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 90% | 49,719 psi | 90% | 3133 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 65% | 1972 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 47,703 psi | 86% | 2982 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 49,763 psi | 90% | 3041 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 47,776 psi | 86% | 2989 fps | 96.6% |
| IMR 4831 | <<locked>> | 92% | 48,138 psi | 87% | 3051 fps | 99.1% |
| IMR 4895 | <<locked>> | 82% | 49,908 psi | 90% | 3074 fps | 99.8% |
| Lovex S062 | <<locked>> | 82% | 47,892 psi | 87% | 2986 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 47,558 psi | 86% | 2986 fps | 97.9% |
| Lovex S070 | <<locked>> | 90% | 48,457 psi | 88% | 3022 fps | 97.1% |
| Norma 203B | <<locked>> | 82% | 48,037 psi | 87% | 3028 fps | 99.6% |
| Norma MRP | <<locked>> | 98% | 47,964 psi | 87% | 3150 fps | 96.8% |
| Norma URP | <<locked>> | 92% | 49,835 psi | 90% | 3104 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 82% | 48,443 psi | 88% | 3051 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 48,660 psi | 88% | 3091 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,680 psi | 66% | 2024 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 49,719 psi | 90% | 3031 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 48,704 psi | 88% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 47,195 psi | 85% | 3074 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 49,719 psi | 90% | 3159 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 49,603 psi | 90% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 49,066 psi | 89% | 3038 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 48,950 psi | 89% | 3009 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 47,558 psi | 86% | 2986 fps | 97.9% |
| Shooters World Precision | <<locked>> | 82% | 47,892 psi | 87% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 48,457 psi | 88% | 3022 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 47,282 psi | 86% | 3035 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 47,645 psi | 86% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 47,094 psi | 85% | 2930 fps | 96.6% |
| Somchem S355 | <<locked>> | 86% | 49,182 psi | 89% | 3031 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 48,486 psi | 88% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 47,892 psi | 87% | 3035 fps | 96.1% |
| Vihtavuori N135 | <<locked>> | 82% | 49,632 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 47,340 psi | 86% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 48,573 psi | 88% | 3041 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 48,530 psi | 88% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 48,080 psi | 87% | 3045 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 98% | 47,514 psi | 86% | 3094 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 48,385 psi | 88% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 49,966 psi | 90% | 3110 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,278 psi | 75% | 3107 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% | 45,455 psi | 82% | 2900 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 39,262 psi | 71% | 2854 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 44,730 psi | 81% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,431 psi | 60% | 2736 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 42,699 psi | 77% | 2890 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,514 psi | 84% | 3104 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,859 psi | 78% | 2917 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,759 psi | 83% | 2986 fps | 99.1% |
| Alliant Reloder-16 | 37.1 gr | 80% | 33,170 psi | 60% | 2749 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,159 psi | 67% | 2884 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,125 psi | 56% | 2713 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,565 psi | 68% | 2897 fps | 95.2% |
| Alliant Reloder-26 | 46.1 gr | 90% | 36,303 psi | 66% | 2913 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 42,786 psi | 77% | 2920 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 46,079 psi | 83% | 2949 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 43,323 psi | 78% | 2927 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 43,511 psi | 79% | 2979 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 46,992 psi | 85% | 3005 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,516 psi | 55% | 2638 fps | 96% |
| Hodgdon Superformance | <<locked>> | 88% | 46,093 psi | 83% | 3058 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 48% | 1765 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,860 psi | 81% | 2930 fps | 99% |
| IMR 4350 | <<locked>> | 88% | 43,830 psi | 79% | 2923 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,119 psi | 76% | 2867 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 34,606 psi | 63% | 2753 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 46,934 psi | 85% | 3018 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 44,759 psi | 81% | 2927 fps | 99.8% |
| Lovex S065 | <<locked>> | 80% | 37,115 psi | 67% | 2756 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 42,656 psi | 77% | 2904 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 45,165 psi | 82% | 2972 fps | 99.3% |
| Norma MRP | <<locked>> | 96% | 44,701 psi | 81% | 3081 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,576 psi | 61% | 2740 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 45,223 psi | 82% | 2992 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 39,914 psi | 72% | 2904 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 49% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,511 psi | 79% | 2907 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,508 psi | 71% | 2956 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,534 psi | 64% | 2815 fps | 95.6% |
| ReloadSwiss RS 70 | 42.6 gr | 84% | 37,565 psi | 68% | 2884 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 46,644 psi | 84% | 2946 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 40,306 psi | 73% | 2861 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 46,079 psi | 83% | 2949 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,115 psi | 67% | 2756 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 44,759 psi | 81% | 2927 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 42,656 psi | 77% | 2904 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,234 psi | 75% | 2913 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,018 psi | 76% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,350 psi | 75% | 2808 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 40,901 psi | 74% | 2864 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 30,124 psi | 55% | 2687 fps | 97.3% |
| Somchem S385 | <<locked>> | 94% | 44,715 psi | 81% | 2969 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 46,557 psi | 84% | 2920 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,986 psi | 71% | 2795 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 34,911 psi | 63% | 2743 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 45,382 psi | 82% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,403 psi | 62% | 2736 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 31,734 psi | 57% | 2733 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,461 psi | 62% | 2713 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 43,801 psi | 79% | 2986 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,370 psi | 53% | 2736 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 60 powders for .243 Ackley Improved loaded with the .243 | 90gr | Lapua ScenarL. Alliant Reloder-26 delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,202 fps. Accurate 3100 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 65–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:9.0 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, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 90gr | Lapua ScenarL 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.