I was told that the lugs could be built up as to make up for the head space , I have heard. Maybe you can call Rob for exeter arms a call he say gots new gun smith, and runairon is another, I have a new lic gunsmith BENTLEY out of Cario, NE doing some bolt/headspace work for me but I am currently awaiting a fluted bolt for my 30-06, and the barrel is not ajustable as I have a Straight-jacket on it....