I shoot 130 TSX and 150 Honrady Interbonds in my 308. I have interchanged them freely for over 15 years and have never worried about mixing the different kinds of copper, mostly because it never occurred to me to worry about it. The gun will shoot both loads to within a 1/4" of the same POI and will put either load into a 1/2" at 100 yards for three shots so I really can't see that mixing them has any negative effect.
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