Hey Supercracker, I only shot a few and haven't noticed plastic in the bore. In some posts I thought I remember someone suggesting no problems as long as an overpowder wad (lubed) was used, and others have said the plastic just comes out with the cleaning...I dunno, that's why I asked. I figure, why not ask, this forum has a great collective information on the subject which is something I never had 20 or 25 years ago the last time I really tried fooling with this type of shooting.
I'd be doing more shooting with it now, but we've got the opening day of a two week muzzleloading season saturday, the snows are starting to work into the area with this last cold front, and there is this thing coming up on the 25th I have to spend time in malls and other things. It kind of limits my time to play with the new toy.