Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 88gr | Warner Tool Co. Flat Line bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 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 2495 | <<locked>> | 82% | 47,964 psi | 87% | 2969 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,763 psi | 90% | 2999 fps | 95.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,484 psi | 82% | 3009 fps | 96.8% |
| Accurate 4064 | <<locked>> | 84% | 48,283 psi | 87% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 47,761 psi | 86% | 3087 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 86% | 49,269 psi | 89% | 3041 fps | 99.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 47,413 psi | 86% | 3143 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 49,371 psi | 89% | 3068 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 84% | 49,603 psi | 90% | 3084 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 49,168 psi | 89% | 3153 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 49,864 psi | 90% | 3186 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,989 psi | 78% | 3038 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,921 psi | 89% | 3232 fps | 98.9% |
| Bofors RP3 | <<locked>> | 86% | 49,850 psi | 90% | 3081 fps | 99.9% |
| Bofors RP7 | <<locked>> | 90% | 49,777 psi | 90% | 3041 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 47,340 psi | 86% | 3028 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 90% | 47,282 psi | 86% | 3077 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 48,965 psi | 89% | 3077 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 48,008 psi | 87% | 3077 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 65% | 1982 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,647 psi | 90% | 3054 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 48,660 psi | 88% | 3022 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 82% | 48,341 psi | 87% | 2992 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,588 psi | 88% | 3022 fps | 96.3% |
| IMR 4831 | <<locked>> | 94% | 48,820 psi | 88% | 3087 fps | 99% |
| IMR 4895 | <<locked>> | 82% | 47,732 psi | 86% | 3058 fps | 99.5% |
| Lovex S062 | <<locked>> | 84% | 48,776 psi | 88% | 3025 fps | 99.9% |
| Lovex S065 | <<locked>> | 90% | 48,269 psi | 87% | 3018 fps | 97.7% |
| Lovex S070 | <<locked>> | 92% | 49,240 psi | 89% | 3058 fps | 96.8% |
| Norma 203B | <<locked>> | 84% | 48,907 psi | 89% | 3068 fps | 99.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,240 psi | 87% | 3176 fps | 96.3% |
| Norma URP | <<locked>> | 92% | 47,384 psi | 86% | 3077 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 84% | 49,429 psi | 89% | 3094 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 94% | 49,429 psi | 89% | 3130 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 66% | 2028 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 47,529 psi | 86% | 3009 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,763 psi | 90% | 3192 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 47,805 psi | 87% | 3107 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 46,992 psi | 85% | 3123 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 82% | 47,834 psi | 87% | 2989 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 88% | 49,676 psi | 90% | 3071 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 90% | 49,777 psi | 90% | 3041 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 48,269 psi | 87% | 3018 fps | 97.7% |
| Shooters World Precision | <<locked>> | 84% | 48,776 psi | 88% | 3025 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 92% | 49,240 psi | 89% | 3058 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 48,225 psi | 87% | 3077 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 49,893 psi | 90% | 3064 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 48,675 psi | 88% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 48,037 psi | 87% | 2963 fps | 96.3% |
| Somchem S355 | <<locked>> | 86% | 47,108 psi | 85% | 3018 fps | 99.6% |
| Somchem S365 | <<locked>> | 96% | 48,675 psi | 88% | 3140 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 47,630 psi | 86% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 47,993 psi | 87% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 48,051 psi | 87% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 49,284 psi | 89% | 3074 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 84% | 49,545 psi | 90% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 48,791 psi | 88% | 3081 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,747 psi | 86% | 3127 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,414 psi | 89% | 3051 fps | 99.9% |
| Winchester 760 | <<locked>> | 90% | 47,282 psi | 86% | 3077 fps | 96.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,624 psi | 70% | 3054 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 49,632 psi | 90% | 3068 fps | 99.8% |
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% | 44,947 psi | 81% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,775 psi | 85% | 2943 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 39,726 psi | 72% | 2887 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 42,496 psi | 77% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 36,100 psi | 65% | 2831 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,814 psi | 74% | 2867 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,135 psi | 80% | 3074 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,814 psi | 74% | 2894 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,743 psi | 79% | 2966 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,839 psi | 65% | 2844 fps | 95.8% |
| Alliant Reloder-17 | 38.8 gr | 80% | 35,418 psi | 64% | 2858 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,372 psi | 57% | 2736 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,521 psi | 66% | 2936 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 40,712 psi | 74% | 2900 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,789 psi | 85% | 2982 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 41,365 psi | 75% | 2904 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 44,005 psi | 80% | 3012 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 31,096 psi | 56% | 2674 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,686 psi | 81% | 3012 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 48% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,601 psi | 84% | 2995 fps | 99.5% |
| IMR 4064 | <<locked>> | 80% | 42,888 psi | 78% | 2907 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,469 psi | 82% | 2933 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,687 psi | 83% | 2963 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 35,012 psi | 63% | 2785 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 44,831 psi | 81% | 2999 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 42,989 psi | 78% | 2913 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 40,074 psi | 73% | 2848 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 43,178 psi | 78% | 2933 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 43,105 psi | 78% | 2953 fps | 98.8% |
| Norma MRP | <<locked>> | 98% | 45,237 psi | 82% | 3110 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 36,274 psi | 66% | 2831 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 42,931 psi | 78% | 2966 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 40,393 psi | 73% | 2936 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 49% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,698 psi | 75% | 2884 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,666 psi | 68% | 2933 fps | 99.7% |
| ReloadSwiss RS 62 | 40.7 gr | 84% | 35,955 psi | 65% | 2848 fps | 95.3% |
| ReloadSwiss RS 70 | 42.4 gr | 86% | 38,363 psi | 69% | 2920 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 44,904 psi | 81% | 2933 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 38,290 psi | 69% | 2838 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 46,789 psi | 85% | 2982 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,074 psi | 73% | 2848 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 42,989 psi | 78% | 2913 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 43,178 psi | 78% | 2933 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,276 psi | 71% | 2890 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,601 psi | 84% | 3002 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,364 psi | 73% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,063 psi | 82% | 2904 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 38,943 psi | 70% | 2844 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 28,529 psi | 52% | 2654 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 44,599 psi | 81% | 2910 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,020 psi | 81% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 67% | 2772 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 35,360 psi | 64% | 2772 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 43,497 psi | 79% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,405 psi | 68% | 2835 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 34,185 psi | 62% | 2825 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,822 psi | 59% | 2687 fps | 96.7% |
| Winchester 760 | <<locked>> | 88% | 44,367 psi | 80% | 3018 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,675 psi | 54% | 2756 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,282 psi | 84% | 3005 fps | 99.6% |
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 | 88gr | Warner Tool Co. Flat Line. Alliant Reloder-26 delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,232 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 88.0 gr projectile in 0.243" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for .243 Ackley Improved with the .243 | 88gr | Warner Tool Co. Flat Line 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.