Thanks for the info and the bump. I read the 308 thread and have a few more questions. I calculated bolt thrust for both rounds per info in the thread and came up with the following:
6.5x55 (.480 dia) = .181 x 45000 psi = 8145 pounds
7.62x39 (.440 dia) = .152 x 45000 psi = 6840 pounds
Iím not an engineer, but I donít think itís this simple. There should be some difference in bolt thrust depending on bullet weight, right?
How about if I rebated the rim on the 6.5? If I turned it down to .440 it wouldnít lessen the force on the bolt face, right?