id use it when im shootin all day just to tether to ..it would be like increasing your 3k psi guns tank size about 50X .. if your gun shoots better at say 28 then only fill it to there ..
Is this a CF wrapped bottle or steel (looks like steel)? If steel which is more typical for 3K psi bottle NO life span limit just has to past a hydro test every 5 years. 3K is pretty low pressure so you need a gun whose fill is lower than that of course so could be okay for the right buyer.