Hmmm penetration you want? .45 LC Buffola Bore 300gr FN cast bullet. 6.5" Judge didn't work out for a shooting buddy. Shoots warm hunting loads well I had a Sight Mark mini pro reflex put on it and the tigger cleaned up. Kinda ugly but it shoots good. BB FNL 300grs. 2&1/4" 10 shot group at 50 yds off of bags.