Hi I'm not sure how to use the form. I have a question for any that may know the answer. I have Savage mod 12 ssv that is a .223 now, but I'm trying to make a 6mm BR. I have been trying to change the bolt head from 223 to a 308 bolt head. So far the three heads don't work on the 223 bolt, soom one said back home that they would inter change. How can it be done ? Thank you. Bill