Well I fixed it and it was a bear. I truly do not know what caused it. We had gone to the range yesterday afternoon and were zeroing the rifle and everything was good to go. Then he started to have a hard time closing the bolt on a loaded round. When the round was removed from the chamber it showed huge jam marks on the bullet. I blamed me reloads and we stopped shooting. I got the ammo and the rifle home and measured them. They were all exactly the same length and headspace. But when I checked the seating depth on the rifle using a Frankford Arsenal OAL gauage, that goes on the cleaning rod, I was getting 2.901 overall length. I had his rounds loaded at 3.110. Thats a pretty big difference for me to mess up at the loading bench! I got out my notes from when we started load development and I saw that the original seating was 3.125. I also could not get a Hornady modified case to chamber to check the OAL.
I pulled the barrel and could not see anything obstructing the chamber area but I dont have a bore scope and the flashlight really doesnt do a good job! Well I worked on the chamber area with a nylon brush and carbon remover and was able to remove something because now its right back to 3.125" OAL. I have the barrel reinstalled and headspaced. I pulled the remaining rounds and set them back to new brass numbers and am headed out to the range to rezero it as soon as it warms up a little.
I am still not sure what casued this issue I have never seen anything like it before.
Im sure I did way more work than was necessary but I could just see in the chamber area better with the barrel off.
Ryan
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