You’re sizing in the Lee push through die, correct? I tumble in Lee Lube-Alox, but I’d honesty expect One Shot should have been slippery enough.

I’ve sized a bunch of the 180 Hotcors - with the Lube Alox, I’d generally gauge (with my not-so-highly sophisticated and insufficiently calibrated fingers and failing memory) that the sizing pressure is lighter than sizing 30-06 cases. Definitely less pressure than small base sizing 6 creed brass. Even on my old wiggly bench (Black & Decker Workmate with an MDF top), and in a relatively low leverage Lee Classic Turret press - pictured below ~5yrs ago.