I just measured my .277 and .284's with my trusty dial calipers, and they are, as close as I can read, about .283-something. Maybe 5 thou less than the regular Hornady's I have on the shelf. Not enough to worry about.
Incidentally, the TSX's measure just a few thou less than the GS custom HV's I have laying around. Though one is grooved, and one is banded, the engraving process will actually increase the diameter of the bullets enough to create a seal.
Finally, who shoots enough barnes bullets to wear out a barrel? JMO, Dutch.
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