moridgerunner
You really have to be careful there... with the modern ML the lands and grooves are so shallow that a lubricant can cause the sabot to slip across the lands instead of twisting with the lands.
The material that modern sabots are made of is self lubricating...
If you are loading a sabot that tough to load I would suggest search for another sabot - in 45/50 caliber there are a ton of different thicknesses of sabots, even the 44/50 has a couple of options....
I like Cayugad often roll the outside base (keep the moisture out of the cup) of the sabot on my tongue, just before inserting it into the muzzle... plus I always place the sabot in the muzzle the same way - I always put a petal under the front sight or where the front sight should be.