well I stumbled into a couple one day auctions and bought 10 matt finish 243 win barrels in standard profile for a remington 700 action. and I have 3 on hand now.
I just bought a 6mm-284 reamer so one of those is getting built for sure on a 308 saiga. I have been eyeballing the 6mmAR turbo 40 , the 6mm ppc, and a wildcat 6x39 of my own design.
there not heavy barrels so a super long range varmit gun is out but there is some options here.
The 6.5x284 will get bullets going over 4000 FPS if loded to 51,000 CUP. a light load version at 42,000 cup MIGHT be doablle on a yugo trunion and it will go 3738. I got the reamer an barrels so why not add it to the switch barrel build.