09-28-2022, 02:19 AM
stonehog Wrote:The three I have shown individually were the ones I could see a ridge forming on. The rest look pretty normal albeit a bit rough from the chamber. I don't see this sort of chamber imprint on the other brass I've inspected (FC, Starline, Hornady) so far. My bet is the odin chamber is a bit rougher than the Faxon or PSA. I also looked back at notes showing that I had checked headspace with the Odin BCG and bolt in the Faxon barrel (passed) but I don't see notes that I ever checked the Odin bolt in the Odin barrel. Doh! I probably expected it to be OK as it was a matched barrel and BCG/Bolt purchased. It will be interesting to see if I get similar extraction issues and/or brass markings with the Monster bolt I am replacing it with (that has passed headspace).
BTW - thanks for all the deep dives here folks - I'm learning a ton about both the AR platform as well as the Grendel. Good stuff!
Do you think you could take a measurement of the depth of the head deformation? Basically what is the distance from the "line" to where the bolt starts? This will be a measure of the exposed and unsupported brass wall. With your actual deformed brass we can determine the feed cone depth!
It's interesting that your other brass doesn't have the same imprint. Only the Lapua. Hmmm...
And I totally appreciate you sharing all this! I'm learning and enjoying this thread too.