Well, …. if you can’t win fair in life, CHEAT. Use the sizer that came with the gun.
Slug the bore and use that. It’s not flawless, but it will tell you if you have a problem(s). If want to shoot a lot, then you can use that same slug after your throats and bore wash up. If your using light / short for caliber bullets as defined by how far out any misalignment is, then you will have force executed on a side of the slug that will lead heavier at that point because of friction. This will tell you if you need a heavier slug (more time) (or sometimes a harder bullet) for the clocking to occur. It also keeps your throats from wearing oblong over time. If do you this every so many rounds, you’ll know the round count before you have to clean THAT gun. I always keep the initial slugs for judging wear.