Started reloading 308's for my new build. An ar10 with criterion 20 inch match barrel. Bolt and barrel checked by Fulton Armory and headspace checks fine.
When fired some cases have a round extractor mark, and burr on case head, only on my reloads.
Also the odd round won't go into battery, and I have had 2that totally jamed in the chamber bending the case.
I am using Dillon dies, and have gone as far as dialing down the die until it touches the shell plate.
The case gage shows it to be perfect.
I'm using Speer 168 gr HPBT Match with Varget 44grs. Chrono is 2637 average.
Had a similar problem with my AR15 then switched to a small base die, now all is perfect...
Are Dillon dies not compatible with Semi autos?