I bought a 10m target rifle and modified the reg to use it for FT. The original reg had a very small air space within it. I made new parts for the reg to increase the volume to about one cubic centimetre and easily upped the power enough to use it for FT. Not sure of reg pressure but I think most are normally in the 50-60 bar range?
People who kill animals for their own entertainment should be avoided at all costs, both physically and socially, by any means. They will drag you down to their own level, and that is not a place any decent human being would want to be.