Interesting issue with PB checks.
I purchased some .44 PB checks from Sage Outdoors, yesterday I went to checking some Lee TL .430 bullets I cast a few years ago and some 20 year old .430 bullets my Dad gave me years ago. Using my Lyman lube sizer with a .430 die the checks are smearing and tearing. Polished up the die with some Iosso bore paste but issue still persisted. I decided to try the check seating tool that comes with the Lyman press which set the checks to a diameter of .440 which I figured was a little big for my revolver so I removed the check tool and re ran the bullets through the die and low and behold the checks crimped down to .430 with no tearing and a little black aluminum hazing on the lube band. Not sure how to explain it except maybe the bullet and check needed a few minutes to think about there forced union? Bullets must have hardened up quite well as considerable force has to be applied to the press handle to get the checks seated.