Probibly the main reason the the .44 mag. round is not in more semi-aito handgun is the the .45 apc and other round normally chambered in them have a very low chamber presure as compaired to the .44 mag. To put a .44 mag. barrel on a frame designed for a round like the .45 apc. would be building a bomb. To build a .44 mag. semi-auto you would have to start all over with the design to allow for the higher chamber presure, and I guess the the gun makers don`t think that there is enough demand to pay for design and tooling cost for the new gun.
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Catfish
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