I have an old Rem. 700 .243 that my father gave me and I absolutely LOVE that rifle! I have shot that rifle since I was 13 and I am 45 now so I know it very well. The problem is, he literally shot the barrel out of it shooting prairie dogs. It looks like a very nice, clean mirror down towards the breach, lol. I need to replace the barrel and was wondering if I could kick it up to a higher caliber since I have to replace the barrel anyway. .243 is alright for varmints and deer I guess but I would really like it to shoot a larger caliber.