I bought a hw100 in .20 last year and am really happy I did, I find it flies flatter and faster than .22 so less hold over/under required but hits just as hard with a satisfying crack on impact. deadly out to 60yrd. as for pellets you have h&n ftt and jsb exact, my hw loves both. can not comment on the huntsman as never used one, but am now a huge fan of .20 and will use nothing else in 12ft lb