I don't have a 77/44 but been loading 44's since the 70's. Yes you want to crimp. Currently I have a Marlin lever action and a Blackhawk ( not a super Blackhawk) in 44 mag. Use mine for scouting , still hunting deer, and wild pigs. Kind of my go to combo. I'm not loading anything with that heavy a bullet.
Been thinking about a 77/357.