Question for Greener4me

first let me say thx for all your help. In your previous post you mention 13 as bore size and that the barrels are almost out of proof. My understanding is that given the age of this gun, the 13 stamp translates into an expected bore size of .710, therefore making this gun out of proof, given that the bores now measure .727.

Do i have the correct information or am i missing something.?