Use a dark Sharpie marker on the shoulder & the junctions of body & neck as well as around the base at the pressure ring. Hell... color the whole case. Chamber, extract, & look for marks where it's hitting.
See above comments for remedy.
If the base needs sizing, I've heard that stripping a 45ACP sizing die will allow you push the case all the way thru. Carbide will be easier. Not sure if I'd do this to a loaded round..
