I can load up 19 TUI or 200gr JHPs by hand without much difficulty, I can barely get a 17th Steinel in sometimes if I force it. Maybe the mags will loosen up since the springs are kinda new but the Steinels are longer since i can spin a magazine atop a Steinel bordered by two TUIs but not a TUI bordered by Steinels.
I'm NOT saying "these bullets are out of spec and bad don't buy them" because I don't know anything about SAAMI specs and y'all know I don't own calipers. I think the design of the rounds is really cool, and like they say about the relation of lures, fish, and anglers. I'll admit they won't be my go-to bedside ammo unless the mags loosen up since to me 20rds of 200gr Underwoods > 15rds of SCHP Steinels but I'll probably buy more to load into 14rd mags to sit in case of a day I need a crap ton of pre-loaded mags for my bedside gun.