I have an acquaintence with a 3" Mod 10 K frame conversion to 44 Spl. It's a very handy size gun and and he uses only traditional factory loadings in the 750 fps range.
The issue with barrel diameter at the threaded end is a non-issue. The threaded diameter for K frame barrels and L frame 44 specials is the same. But on a K frame the bottom edge is flattened for crane closure, the cause of barrel cracking and eventual demise of the .357 Mag Mod 19.
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Jim
S&WCA #819
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