Get a nice 1-8" twist free float bull barrel, a good trigger and scope and you'll be set. I used speer 69gr Matchkings to get some one ragged hole groups from an armalite bull barrel I had. At about 6000 rounds it quickly opened up to 1" and I sold the barrel. Stick with the 20" barrel, the 24" barrel is unwieldly IMHO unless you'll always use a rest. If you reload you can play around until you get a combination your gun shoots well.