I’m a big fan of the 760/7600 carbine , it’s one of those rifles that is so much better than most think it is. One of the best carry rifles to still hunt or track with. Fast follow up shots and much more accurate then it has a right to be. I have never had one rebarreled but I know there is companies who do it. The 257 roberts would be a cool little cartridge to have in a carbine. I like the idea !