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Standard barrel muzzle diameters range any where from .640" to .750", depending on length and chambering, bull barrels are ~.800" at the muzzle, 357 is ~.740", and the big bores are even bigger, up to ~.890" for the .500 S&W. My 243 Superlight is .637" and the 30-30 is .642", not a lot of difference for some barrels. Marv's superlight is .595" IIRC. The 26" barrels are also a bit smaller than the shorter standard barrels at around .650".