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To measure the bore diameter you will need a bore gauge. It looks something like this:


You first measure the bore and then the choke at the end of the muzzle. The difference tells you what your choke is. Assuming that your bore is really .615 and you have Full choke, I would expect your choke diameter to be .580"-.575" or 35 to 40 thousandths constriction. Forget the names. Different manufacturers use the same term for different constrictions and there is no standard. Some say .035" is a Full and some say .040" is a Full. Who cares as long as you know what yours is.
 
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