Seems like the main issue is the feeding of the rounds. Hmmm? Maybe, you can restrict yourself to two rounds in the rifle for hunting purposes (I never have taken more than two shots to kill an animal). Redesign a custom mag follower per caliber to help with feeding of over gapped feed rails? I would love to have more firearms in my collection, but I feel this would be a fun project and diverse rifle. If worst comes to worst, I will stay with one caliber but switch from a heavy barrel to a sporter barrel, 16" to a 26", etc...