I reload for 9mm and 10mm and notice that there are black soot on the side of most brass i pick up. I dont see this as much with a factory loaded round. I use the Hornady dies that seat and crimp in one station and wondering if maybe the crimp is not right or tight enough??? There are no pressure signs at all on any of the brass such as flatten primers, leaking primers, case bulges or cracks, etc. All inputs appreciated.