Parker 13 gauge?

[Jack Hamner]

Originally Posted by Dave Purnell

First, bore is measured in inches. 18 millimeters is .709 inch. I don't know what that means, except it's probably smaller than a 12ga gun. Accurate bore and chamber dimensions will have to be taken with a gage that can measure in thousanths of an inch.

Thanks again, Dave. I was just using centimeters because they're easier to read on a ruler than trying to figure out hundredths or thousandths of an inch on the ruler. Obviously, the ruler is not an accurate enough measurement. I was just using what I had for a rough guesstimate until I can find something else. Thanks for all your help! Jack.