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Wow Sgt. Mike. A mathematical formula using a reasonable standard (3K round barrel life) with empirical data from actual records. Now we can make some accurate predictions of barrel life. If we accept the 3K round barrel life as the standard for normal bore, then anything resulting in less than 3K round barrel life becomes overbore. I can live with this.
At the same time, I have no problem with those that demand increased performance from an overbore cartridge. They are willing to accept a shorter barrel life. As others have stated here, it may not be a problem for someone that will never shoot 1K through that barrel in the rest of their life. I never expect to burn out the barrel of my .375 H&H. My .223 varmint rifle on an AR, probably so if there are enough prairie dogs to please me.
This has been a good thread.