Good morning! I have read as many threads as I can find regarding 12 gauge proof pressures, and the various psi/ton/bar conversions and such. I'm tolerably familiar with them, but i just saw a 20 ga for sale with nitro reproofs (rifle conversion). What did the gents across the pond normally proof 20 gauges to? Is it the same 3 or 3.25 tons that 12's were? Unfortunately I dont have any pics of the proofs to see

NRA Patron Life Member