There are all kinds of things that can cause this. First of all, Have you cleaned your chamber ?
Have you tried factory ammo ? If so, same issue ? If so, could be a combination of the head spacing being set wrong and a rough chamber with tools marks, etc.
A picture of the fired brass’ neck, body, head with the primer still in it would help!
Any ejector marks ?
Any carbon leaking around the primer ?
What brass are you using ? Brass captivity can vary. Hornady brass holds a grain or two more than Peterson brass i.e. You can get a heavy bolt lift without flatting the primers in brass with small primer pockets. Seen this in a 6.5 Creedmoor.
What primers are you using ? Winchester and some CCI primers are hard and you won’t always see flatting or cratering of primers.
What bullet and weight are you using ? Do you have a OAL gauge ? Did you check to ensure your bullet is not in the lands ?
At this juncture, I don’t think your die is the issue since you full length resize and your loaded rounds chambers easily (assume bolt closes easy) which brings me to the next question.
Do you have a headspace gauge aka comparator ? This is a great tool for measuring your fired brass and setting your die to bump the shoulder back .002-.003. You still have to check the brass in your rifle to ensure the bolt closes without being forced or has too much resistance.
Anyway, If you don’t have one buy one as Hornady’s L-N-L Comparator System is cheap and every reloader should have one.
These are things that come to mind at the moment.
Bookmarks