The overbore ratio seems to be the greatest cartridge design factor, and heat abuse caused by repeat firing is a big contributor that could be reduced significantly by the operator. A buddy uses HV contour barrels that have a long shank so he can have the chamber set back when the throat starts to wash out. Although I have never washed out a throat, a couple of times I have done the initial chamber with a "short" cartridge (6.5 X 47), cut the shank 1/2"", and recut the chamber to a longer cartridge (260 Rem). Would not do this with a heat cracked barrel.
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