What scratchmark said.
The 44 barrel is a smaller dia than the 45 colt
.429 vs .452 Thus that’s why the rebore.
You could however ream the 44 mag to a 445 supermag with only reaming the chamber.
The 445 SM is just a lengthened 44 Mag
It would have to be on a SB2 ( Rifle ) receiver.
You would need to reload or buy specialty Ammo from someone like reeds ammo.
Just another thought.
TT
Actually the groove diameter of the 44mag rifle is .431" ish, not the same as pistol's.429". Give Jesse a call at JES and ask him about the conversion.
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