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With the development of slower burning powders, the number of rounds with an “overbore” reputation has decreased significantly.

I like to get about 4,000 rounds out of an accurate barrel for match or prairie dog use. The hot 6mm and 6.5mm rifles that are now very popular for long range match shooting will rarely make it to half of that before loosing accuracy. For me, that meets the criteria of “overbore” capacity. Probably doesn’t matter if you only plan to fire a rifle 20 or times a year as a big game rifle, but my rifles will often get 100 times or more use than that.

I think that the very first “overbore” rounds must have been the 220 Swift, the 244 H&H Magnum and perhaps the 280 Ross.

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