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smaller caliber
Small-bore refers to calibers with a diameter of .32 inches or smaller. It may also refer to small-bore rifle competition. The medium-bore refers to calibers with a diameter between .33 inches up to .39 inches and large-bore refers to calibers with a diameter of .40 inches or larger. Miniature bore refers historically to calibers of .22 inches or smaller.
There is much variance in the use of the term small-bore which over the years has changed considerably with anything under .577 caliber considered small-bore prior to the mid-19th century.
So, they've been around for as long as I can recall: those steel inserts that you can drop into a shotgun and they allow one to fire a smaller shotgun cartridge or a rifle/pistol cartridge. What has your experience been with them? Handy tool or waste of time? How did they work out in...