I’ve been having a similar problem with Bayou 45 225 TC. They have not been grouping well and often won’t gauge correctly. Today I measured 20. 14 measured .453, 6 measured .454. I plan to run some thru a .452 sizer and then check to see if groups improve. I plan to try a different vender to see if I can get a coated bullet that I won’t need to size.