Turns out that savage has a proprietary barrel nut and wrench. I have a 1:6.5 faxon barel on the way but cant get the barrel nut loose. No help from savage, they want to put another factory barrel on it. I have no desire to send it in again and have the same result. The barrel nut is the holdup right now. I've talked to some guys that had to cut it off. Its factory torqued to 75 ft pounds. Nothing I've found will fit it but I'll keep you posted.Negative... haven't shot it yet. I've been focused on a bolt gun purchase for PRS so I haven't touched the MSR. I'll definitely shoot it with different load recipes before I change anything. Still interested in your project though. Good luck!