Re: Which rifles easy to rebarrel
The twist for the Ruger American in 22-250 is 1:10. I have confirmed this with Ruger Customer Service. Though there are not yet pre-fit barrels available for the Ruger, it has a barrel nut arrangement that would theoretically allow DIY barrel replacement just like the Savage rifles. If you are primarily hunting groundhogs, your barrel should last awhile.
The Ruger American in .223 has a 1:8 twist, which would allow for excellent versatility and long barrel life.
While I am personally a 22-250 fan, I can certainly see the potential virtues of the .223. It all depends on how much speed and splat factor you really want.