You can look on the SAAMI (Sporting Arms & Ammunition Manufacturers Institute) website for specifications of each round, but but in general .22 centerfires have a .220" bore and .224" grooves, cartridges from .243 to 7mm have a .007" difference between bore and grooves, and .30 and up have a .008" difference. A .308 Winchester, .30-06 or .300 Magnum will have a .300" bore and .308" grooves.

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