I've been collecting Fox doubles for almost 50 years before most practical gauges and instruments were available to the average shooter/collector. Back then and now, I guess most of us would base our buying decision on the condition of the gun, price and need or desire.
I have an early style A grade 12 gauge Fox, SN 7983 that I have owned for a little over 47 years and shot easily several thousand rounds through it. Back when lead could be used for waterfowl, 2 3/4 inch magnums were my choice for ducks and geese. In the last few years tho about the heaviest I shoot out of the old girl is 3/4 ounce.
Your question poses another good question: If you've had a gun or guns that you have shot a lot and measured the barrel wall thickness and found it was around 0.019 inches or a little less, would you quit shooting it?
Yeah, good question.
Jolly
