This is simply my opinion, and my interpretation is as such:
Low round count - means nothing to me because the definition of "low" can vary from person to person.
The second thing, being discussed, is the barrel life of a particular caliber. Assuming the frequency and use of a rifle is equal, generally the more the overbore a cartridge is, equates to greater ablation of throat, the less the barrel life. Even if we skip over the reloading argument of this equation "how hot you run it" -the same caliber i.e. 30-06 can vary because the materials of/and how barrels are produced vary.
As well, if you review barrel life numbers by discipline i.e. F-Class, PRS, Hunting etc. you will get a wide margin of numbers, and that simply reflects 1) how those barrels are being run and 2) what kind of accuracy is acceptable for each discipline.
But then again, this is only my experience. Hope that helps.
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