Re: 20 ga chamber strength Archived Message Posted by Drew Hause on April 6, 2018, 10:49 am, in reply to "20 ga chamber strength" Turn-of-the-century 20g loads with 7/8 oz. and 2 1/2 Dr. Eq. BULK Smokeless ran 8000-9000 psi; DENSE Smokeless was about 11,000 psi. Hunter Arms proved 20g guns with 5.74 Drams black powder with 1.5 oz. shot = about 16,000 psi by modern piezo transducer measurement. ANY vintage barrel should be evaluated before use, but the original barrel was certainly designed for modern load pressures. More information https://docs.google.com/document/d/1F2sQuPm05IE4VWYYnCkvuXmYEzQoWd_SQgaAfUOZEFU/preview Message Thread: 20 ga chamber strength - MIKE FISHER April 6, 2018, 9:08 am Re: 20 ga chamber strength - Drew Hause April 6, 2018, 10:49 am Re: 20 ga chamber strength - MIKE FISHER April 6, 2018, 11:05 am Re: 20 ga chamber strength - Pastorcharlie April 7, 2018, 2:12 pm   Searching