I've been using just a tumbler for many, many years. The last thing I do before I prime my brass is brush out the inside of the cases. When in a big hurry, I will not brush them out, and as far as I can tell, accuracy does not suffer at normal hunting ranges. If you are a serious, long range shooter, you might see a difference at 600-800-1,000 yards, but that's a whole different shooting world than mine!
Edited by mikei (11/08/16 10:23 AM)