ORIGINAL: Semisane
Good question Lee. I've never noticed a plastic build up in any of my barrels. After Grouse's earlier post I double checked the bore of my .45 LRH barrel because I recently shot a lot of sabots through it with some pretty hot loads. I even tried a tight patch very wet with carburetor cleaner and got nothing out of the barrel, though I never use a brush in my ML barrels. I wonder if a brush would find some plastic?
Probably. I know a lot of people are against the use of bronze brushes in their bores. I really don't know why because thats all the military uses and I can personally testify that they don't hurt anything. But since all I can ever find in the .50 cal size is nylon bore brushes, that's what I use. And I never have a plastic build-up issue.