A stuck case will teach you a LOT !
My #1 take away is if they start going in HARD - STOP ...somethings wrong and if they GO IN hard ...they Coming Out Even Harder .
#2 Let any /all alcohol based case lube dry ... Even Lee case lube mixed with alcohol and sprayed on ... You have to let the alcohol DRY Completely .
#3 the messiest and best , hard to size case lube is STP Oil Treatment ...it's greasy and messy and must be removed but that stuff is Slick and will get cases sized when nothing else will .
Gary