determining bore size with 5 groove barrel?

maynard: nope, it's groove diameter that corresponds to your figures. Bore diameter is more likely to be .299 and up a bit. You shouldn't be able to get a .306 to enter a 30 cal barrel unless there is a whole lot of wear.
 
maynard: nope, it's groove diameter that corresponds to your figures. Bore diameter is more likely to be .299 and up a bit. You shouldn't be able to get a .306 to enter a 30 cal barrel unless there is a whole lot of wear.

My bad, you are correct. I think my Bartlein is a .298"x.3075". shoots like a lazer.
 
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