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5.7 Johnson
The 5.7 Johnson was a .30 Carbine necked down to .224 caliber. In the Handloaders Manual of Cartridge Conversions they state the case capacity is 16.47 grains of water. If this is close to your capacity the only loads they list are 40 gr. bullet with 14.0 grains of 2400 or 50 grain bullet with 14.0 grains of IMR4198.
Rod
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"... he held his gun as almost every man skilled in such matters preferred to hold one when in action, with a half bent elbow that brought the gun slightly in front of his body at about, or slightly above, the level of the waist." - Wyatt Earp from Wyatt Earp Frontier Marshall by Stuart N. Lake
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