Had mine for a couple weeks and have ruun 400 rounds through. I have used RWS 124 fmj, CCI Blazer Brass 115 fmj, Sellier and Bellot 115 fmj, and Ultramax Remanufactured 115 jhp. No issues whatsoever! I am shooting low right with almost any ammo...seems i need to adjust something on me and not ammo