Without looking anything up, I would want MORE thickness for the smaller gauges simply because the pressures are higher, in them. I like to see about .160" @ breech, .095" or more at the beginning of the farcing cone(end of chamber) in a 12 gauge. I would not like less in 16, 20, 28 or .410. Again, because the pressures are higher, as the gauge goes smaller. JMO, of course

> Jim Legg <