What Jody said. Blazer quality has taken a dive IMO. I came upon an old stash of Blazer brass that actually used a jacket. The current offerings I have seen use a plated bullet (nothing wrong with that) but it is generally cheaper. They certainly produced less velocity than the product from "back in my day". I have the chrono results in a log book. I will post them if I come across it. In short, I would suspect the ammo. But hey, even HK isn't perfect.