Well, did a little rescearch and it looks ...
like a new frame will be needed as the .44Spl., maximum pressure is 14,000psi. While the .45ACP [which is the .45 Auto Rim, with a rim to headspace on] is 18,000 -20,000 psi.
The basic idea was to use present frame with the shorted cylinder and gain teh additional barrel length.
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