Thread: Question about chambering

Hey guys, I have a question for all the gunsmith types,
I have a ruger m77 hawkeye, I was having a play around with some neck sized once fired brass today and I noticed a pronounced ridge running around the brass about 7mm up from the bottom, I dropped one into the chamber of the barrel and it protrudes quite alot back into the action. After a whole lot of looking and measuring I have come up with the face of the bolt is 6.8mm from the rear of the barrel and the front of the bolt locking lugs are 4.2mm from the rear of the barrel. Does this sound normal I always assumed the barrel would be set back almost touching the front of the bolt locking lugs maybe .5-1mm clearance and the whole piece of brass that contained the powder was inside the barrel. I'm wondering if they didn't thread the barrel enough and this has left some unsupported brass. This may explain some of the issues I have been having with my brass life. Of course this may be normal as well? Any ideas? Cheers.