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One of the main reasons everyone is using BR brass...either 7mm, 6mm or 30 cal, is because the benchrest brass is more consistant in thickness and also because it uses small rifle primers where the .308 uses a large rifle primer. The smaller primer is giving more consistant pressures in the benchrest round....not sure how it fares in the subsonic range. You can use .308 brass for making 338BR but you will have to neck turn the brass for it to work. The case is much thicker in the body than the neck needs to be. When you use the BR brass its already cut to the shorter length. Normal .308 brass is 2.005 long and the BR brass is 1.55" + or -. So you can see that the .308 cases will need a bit of trimming and they will be cut down into the thick part.
Hope that answers the question
Frank
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