Not sure what the problem would be for the 2nd barrel not fitting properly. As long as you make sure and get the correct shank size on the barrel they will screw right on. As far as calibers go they are pretty much identical as far as performance goes so it all depends on what you really want. I prefer the .260 for the simple fact that you can form cases from any .308 based varient with ease if the need arises.
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