600 - 700 rounds is pretty low round count even or a .243, even match rifles get double that. I think Jetinteriorguy has the right idea.
.243 is a accurate low reoil cartridge but they are not known for barrel life. A 6BR single shot or a 6.5 Grendel repeater will both give the same accuracy and low recoil and still have 3 - 4 times the barrel life
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“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek
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