i would look for a used anything, but a Remington with a 308/473 bolt face that is also bedded would be ideal. not sure why so much hype on this website over savage and stevens guns. me all the other gunsmiths i have known generally dislike them, but to each his own. Henry Rempel could build you a gun with a Smith barrel that would make you very happy. It also depends on what it will be for. 243AI is a hot cartridge and will not last very long. Best accuracy in the range of 1000-1500 rounds tops. Think about a dasher if you are ok forming cases or even just a 6br. they are good to 1000 yards no problem. there are some very good 6mm competition bullets out there like the berger hybrids that dont need a 243ai to make shoot very accurately at long range.