Logging in a new personal best with the P365x+HS407k; ten rounds on paper for a 83-1X, standing, 2 hand unsupported. This is pretty good for me.
I shot this with range ammo, Federal AE 124. I'd just installed a new WC grip module and tungsten weight set. Gun is around 400 rounds to date. 10 rounds, very slow, very firm hold, dot/target focus, press trigger. You could see the words "tabmoC nosliW" on my palms afterwards.