It always has drained stamina but nothing significant unless you do a kill floor with thralls all carrying truncheon as the main weapon. Placing a concussive mod from a tinkerers bench on most weapons do nothing. On a lodestone it’s seems to boost the already massive stamp drain. I like concussive and wish it was implemented more. But to a realistic level. Especially after disastrous dupe glitches over the last few months and the ability to cheese keys in the obsidian.