Thanks for the reply....I currently have NO Action......on the barrel that is! I'm building from Scratch and just have the chassis which is a long action chassis.....I've researched a number of chamber rounds 300 WIN Mag/ 308. 6.5 and 6 CM. I got a screamin deal on the chassis so I had to get it....$700 for a 2200 chassis! The barrells Ive been able to find on Gun broker are mostly 308 with 5R rifling..So I guess ultimately....If I buy one of the S/A chamber rounds....So depending on what I can fit into the chassis, Ive got a lot of different ways I could go....Just not sure if I buy one of the S/A Barrels if I can use it....I've seen I cant go the other way....e.g. Long action on a Short action chassis.