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Bill999 you are correct but you aint picking up what I'm putting down. we are looking at things from 2 different perspectives
I was more meaning actual velocity rather than accuracy. Also me being...

Bill999 wasn't meaning cocking up the reaming, more so the project calibre not performing the way intended.
My thoughts were if you had the same barrel off a different rifle it was only a change...

Silly question. Instead of the machine work having to reset the barrel back, is there another barrel floating around that you could start with?
Then you have the original barrel you could put back...