Im pretty sure you aren't going to be doing a simple rethread.
Small shank=1.055
Large Shank=1.120
Difference is .065 (65 thousands)
You would probably either strip or bind your threads. Maybe somebody else has tried it?
Two questions.
-Why do you want to change it? There are lots of options available for large shank and its really more suited for the larger chamberings anyway.
-Dont you think it would be cheaper and more reasonable to just get another action? The cost to actually convert a large to small would be expensive even if all you had to do ream and rethread. Itd make more since to put that money towards another action and then you would have two guns to play with instead of one.
If the action is already messed up, and it is really such that you cant convert it, the cost to bore out the reciever over sized, install a bushing and rethread to small shank is going to be pretty expensive. Probably cheaper get another action unless you have the tools.
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