Me too. Am kind of hopeful, but thinking on it, not going with less than 50 just for the primer test. Usually new recipe is 10-15. Will report back and provide pics of my brass if any issues. (always have the sharpie.)
Could be a weak spring, or oil or dirt in the firing pin cavity on the slide. If you have an ultrasonic cleaner you might stick the slide in it with some solvent and give it a few minutes of action to see if that frees up any crud in there.