Re: Question for you .338 guys!
Simple answer is yes it is possible but is it the best way to do it, probably not. The reasons are two fold. First off, generally a 270 cal bushing has a certain sized journel for the live bushing size. The 338 will have a larger diameter so you would need to get a custom made bushing to fit for most brands of reamers.
Second, any time you cut a chamber with two seperate steps, you increase the potential error in the axial alignment of the chamber. Not if you use bushings that are properly fitted, this error should be relatively controled and low but the possibility is still there.
For best results a new reamer would be best in my opinion.
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