As much as I sometimes would like to, blaming the equipment is usually the wrong course of action. Misses happen. Good days, bad days. That sort of thing.

As for dirty barrels, top level competition shooters can burn through several hundred rounds in a day. I am unaware of any of them, as in any, worrying about filth in their barrels. Some will even say they only clean their guns once or twice a year. And they keep breaking targets.