I'm considering the purchase of a 12 gauge hammer gun with Damascus Barrels. I've read the posts about minimum barrel thickness and using low pressure loads. I can find info on barrel thickness but my question is what is considered low pressure? My reloading manuals have 1 oz loads as low as 6300 psi. Some 7/8 oz loads are listed as low as 5200 psi. Is this low enough to use in a Damascus Barrel with adaquate barrel thickness? What is the max psi that is consider safe to shoot in a DamascusBarrel?