Rick,
I have done much the same thing for years, Other than I use a block of parafin canning wax to plug the cases. I just jam the case in the block of wax and pull it out, trim the wax flush with the case mouth.
AS A CAUTION: I ALWAYS check the bore between shots to insure there is no bore obstruction. I'd sure hate to have a bulged or split barrel because of my negligence....
GH