I use corn meal as a filler with lighter loads and smear the front of the cylinder with hi-temp wheel bearing grease.
It'll stay relatively put when it's hot out and not readily migrate downwards into the holster.

I like to use a loading stand I made from scrap wood and dowels to keep my hands free from gunk while loading for plinking.
From the repetition of loading you can quickly learn to judge just the right amount filler and grease to use while avoiding unnecessary excess and mess.
An extra small pistol measure and tiny knife are helpful to wipe the front of the cylinder clear.