Ream chamber to 243AI

The barrel has to be set back for the correct headspace to be established.

What make and model of rifle?
 
An easy one to do...and when the barrel is off make sure the edge of the locking lug recess that the fired brass will rub against is rounded slightly and polished... and shorten the ejector spring 3 coils... other wise when the ejector pushes the brass to the side it will 'catch' on that edge and mark the brass a bit...
 
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