I do, and I get a LOT of fills, when I am filling to 2000 psi.... Don't discount what you can do with that pressure, my Grouse gun has killed hundreds over the past decade.... Having said that, if you are filling a 3000 psi PCP, you want more than that for your air source.... I have two 88 CF SCBA tanks, and a ShoeBox compressor to fill them, and several PCPs that fill to 3600-3800 psi.... It all depends on your want, needs, and budget....No one uses a Scuba tank to fill a PCP gun......NO ONE.
Bob