Has anyone had any luck with these other than bad? I am starting to load for a PETA pd shoot " hoping to kill 90% " like they do. I bought 500 from midway and will be loading for my .20 practical. Has anyone found a sweet spot for the velocity they like? It is a 1-12 twist so I am not worried about blowup, but would like to get 4000 fps or so. Thanks