Mike,
That bore size doesn't seem significantly over the .550 nominal bore size for 28g. Those walls seem very thin for a factory gun. I'm guessing not honed. You have the world record for choke in a 28g now.
My 28" 28g arrived at the dealer today. I won't get it out of jail for 10 days from the day I sign for it, probably tomorrow. Kalifornia has their laws made by the paranoid fools.
I'll see about bore diameter when I get it. What are you thinking about doing with chokes?
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