The new AR Report

[AFJuvat]

^^^this^^^

Small base dies will correct the problem if you have a very tight chamber.

The upside to a tight chamber is they tend to be more accurate, figure out your leade (freebore), modify your seating length as appropriate, and you have a tackdriver.

The downside is small base sizing tends to reduce the life of your brass.

If I were you, I would pick up a few boxes of factory ammo from different manufacturers and try them one box at a time. Note any brands that do not chamber.

If all factory ammo will not chamber, contact PSA, you have an undersized chamber per SAAMI specifications.

[DrHenley]

Too late - He already sent it back. Apparently without ever trying factory loads in it.