I have never ever disintegrated a cast bullet...
. As mentioned, if a cast bullet has a GC shank, and you are wanting best accuracy... INSTALL A CHECK! Regardless of "lube". Generally harder is better for accuracy in a rifle.
Generally EVERY batch if PC'd bullets gets water quenched from the oven. Only exception is for HP that I want as soft as possible.
Generally I GC AFTER coating BUT... some bullets make this difficult at best. These I will gc THEN COAT. But I ALWAYS size last.
I guess one exception would be if I really wanted a fat bullet.
Good luck