If these were your Dad's why do anything with them? If you want to have a certain caliber just go buy one, you're going to spend more for a build than it is worth. Ever hear of the saying "don't look a gift horse in the mouth". There are very good rifles to be bought without going custom. Kimber, Weatherby, Sako, Tikka, Seekins, Bergara, Christensen, just to name a few. Take it from an old man, save those gifts and pass them on to your kids. If you cut them up you will regret it someday. Take this advise from someone that knows because I have done exactly that. I inherited a 30-06 that was my Grandpa's, well I had a safe full of them so I had it rebarreled and customized, I really regret it. I can't get the feeling now to shoot the same rifle my Grandpa shot, just like he shot it. It feels like I have done an injustice to me and my kids. Happy shooting.