I think you mean re-barrel it to 28 or 30 Nosler.I've got an unfired Remington Sendero (original version) in 300RUM. Looks like I might be able to rechamber to 28 or 30 Nosler and have a long, useful mag feed from the standard mag box.
The follow on is, yes you can. Nothing else is different and it works beautifully.