Earliest 20 ga. With 3 inch chambers Archived Message Posted by Phil on August 25, 2017, 10:15 pm Do we know the earliest 20 ga with 3 inch chambers? Do the early guns have any reinforcement before 1924? Message Thread: Earliest 20 ga. With 3 inch chambers - Phil August 25, 2017, 10:15 pm Re: Earliest 20 ga. With 3 inch chambers - Dick Miller August 26, 2017, 5:01 pm Re: Earliest 20 ga. With 3 inch chambers - Phil August 26, 2017, 8:51 pm Re: Earliest 20 ga. With 3 inch chambers - jimmyd August 26, 2017, 10:46 pm Re: Earliest 20 ga. With 3 inch chambers - Phil August 27, 2017, 3:01 am   Searching