Started out with a .17 HMR Sportster to match one a friend of mine bought so that we could plink together, with the intent of adding maybe a HM2 & maybe .22 LR, but ran across a deal (at the time) on a new HM2 so never added barrels. Ive added calibers and actions, but to date have only changed actual barrels on one (factory fit to a different barrel) but have added new lami stock to that action, so not sure if that makes it a "new" one or just "personalized". I realize now that each one is a "dedicated" barrel/action configuration. There is the thought that once you get a good trigger worked out, you could add barrels, but since all but one have settled in to be at least "usable" I don't see the point. Except for a K-Hornet and a 357 Maxi and maybe a 7-08 and possibly a HB 22-260 'yote toter, I think I've about got this fever under control......