It's ok to shoot hevi-shot out of an 835 barrel it's the choke that you have to be concern about. From what I've heared Federal Heavyweight is the same as hevi-shot, Wincherster Xtended Range is softer then hevi-shot. I know the Mossbreg tells you not to shoot hevi-shot out of thier stander choke lead only. The Wincherster should be ok to shoot because
it said to be softer then most gun barrel and choke.