I would read the instructions; I have no reservations about loading nickeled cases. I do have problems with nickeled cases when case forming, when going from 270, 280 and 30/06 to 35 Whelen I split 50% of the necks on nickeled cases. I have formed 200 new/never fired cases to 35 Whelen and 338/06 without splitting one neck.
F. Guffey