It has the stock EAA spring, not sure what that is. Have done no modifications it is brand new out of the box. Mag. is K10 with black followers.

I have a new EAA Witness in 10mm all stock parts that I have shot 50 rounds of Sig Sauer 180 gr. FMJ and 50 rounds of PPU 180 gr. JHP through. The issue I am having is the brass is being dented after it has been shot with the Sig ammo, not as much with the PPU. The Sig ammo seems to have more velocity then the PPU. Any ideas what is causing this, and how I can stop it? See attached pics of dented cartridges.

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