Frank @Lowlight runs a left hand gain twist on a Tikka. I remember hearing him talk about it on the podcast (he talks about it a lot.... it’s really interesting stuffs). I don’t remember if it’s a CM or a .260.... but his results are apparently pretty good.
If I remember correctly, he’s running a shorter barrel and is able to keep his velocity up in the 2800-2900 range due to the gain twist.
Kinda surprised no one jumped on this thread sooner. Do a search for gain twist, and listen to the everyday sniper podcast.... you’ll get a lot of info about it, I’m sure.