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Old December 22, 2019, 04:35 PM   #14
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 16,989
There has to be some underlying assumption about the pressures and temperatures involved to make that work. If I load Hodgon's maximum IMR4064 load for a 168-grain match bullet in .30-06 (50.8 grains or 1.058% bore capacity) and put the same load in a .300 WM where the peak pressure drops 42% and the velocity drops 11%, I would not expect the 300 WM barrel to wear out just as fast as the 30-06. I would not expect that because the surface of the throat is being subjected to a lower temperature and pressure impulse, therefore transferring less heat into its surface and creating less of the surface-to-substrate thermal stress that ultimately causes the crocodile skin cracking pattern that damges a throat.
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