I have the 243 version and it seems to shoot 100 grain factory Federal fine. I also have the 6.5CM and if I'm not mistaken both barrels are 1 in 10 twist. I got some good advice from people on this forum that have much more experience than I do and they advised I shoot 130 grain bullets or lighter in the 6.5. I shot Winchester 125s in it with good results. Does anyone know for certain what twist these barrels are? I was thinking I saw on the CVA website that both were 1 in 10?