DEACONLLB,
They go down smooth in my .502" NEF Huntsman and H&R Sidekick. I have a .5015" Knight that is a little harder, but not that bad.
You can pre-rifle them in your rifle by pushing them through nose first through your unloaded rifle with the breech plug removed. Then you only need to line up the rifling kerfs when you want to shoot them. You can pre-rifle a whole package to your rifle in a couple minutes.