I built 2 rifle in the last month with barrels from 2 companies. The carbon 6 barrel had some problems I posted in another thread. The second barrel is from proof. Now it's on the very edge of sammi spec for 7 mag. Max is .227, using my .223 nogo gauge and a few pieces of scotch tape I found my head space to be about .226. I'm still waiting on a field gauge to confirm but the minimum is .220 and they are not even close to that. Now look at this throat, my guess is the remer was not the tightest fit and favored one side over the other. What do you think? Should I bring it to their attention or is this just what I should expect from companies turning out barrels.