I didn't know you were talking about a slick side.That would be a problem I think.You could probably get a shell deflector for flat top and pop rivet a piece of metal that would breakdown 90* to keep the shell from being pulled back into you.
The more you know: http://www.alloutdoor.com/2014/03/05/hodgdons-revamped-reloading-data-center/?utm_source=Newsletter&utm_medium=Email&utm_content=2014-03-11&utm_campaign=Weekly+Newsletter