Good to hear, I may have to give that a try also, I wanted very much to do this with all factory parts (sans the barrel of course) but the magnum bolt heads are just too much oversized and letting the brass slop around in there and come off the extractor way too early. I will give your idea a try, I am also going to open up a 308 sized bolt head just a touch for the rim and see if that will do it for me. It was working ok with the magnum head, but the unreliable extraction was not going to cut it. Hopefully tomorrow with the new bolt head opened up, all will be solved.