AFAIK the difference between the 110 and 12 bolts is the rear Philips screw vs hex.

I had to send my rifle (.223 F/TR with target AccuTrigger) back to Savage. No complaints there. It is now past time to clean the bolt. I had been able to disassemble the bolt until now. That first step rear screw removal ain't happening no matter what I try. It seems frozen in. Any suggestions other than the You-Tube recommended impact wrench?