Talked with Bruno about this today. He said he will turn it down to whatever final diameter I desire, but will probably have to bed the channel again.
.260? Thinking about that and may go with something a little different just for giggles. Another .22-250 which is a cartridge I've always liked, or an old timer Pa Deer cartridge in a modern package: .300Savage or .250Savage.
Going Grouse hunting tomorrow and will drop it off.