Thread: Max fluting depth

Hi guys and gals. Going to flute a stuffed 308 barrel for fun. From what I have read, you dont want to flute any closer to the bore than .2" or 5.8mm. This will only give me a maximum depth of 1.57mm in my flutes. NOW... this rifle has a stuffed barrel and will only ever be run with subs. (Will stamp subs only onto barrel). How deep could I safely go considering lower pressures? Possibly to .150" or 3.8mm from bore?
Cheers