Seems you are about as likely to run into a .450" cylinder throat on an old .45 Long Colt. Ruger turned out a bunch of modern revolvers with undersize cylinder throats, there was one shop that did little else but ream them to groove (NOT bore, dammit.) diameter plus a bit.
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If you slug the bore, for my Marlin (deep Ballard rifling) 0.002" over groove diameter shoots best,
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I know what Marlin advertises, but I have not been able to find an example or picture of an original Ballard barrel. I think it is just a term of art meaning "not Microgroove."