Very old Imperial ammo was good stuff, but they lost their reputation back in the early 1980's. That particular vintage of IVI - Imperial ammo is about the worst ammo I ever used. In several calibers. Quality control was severely lacking, and IVI quit making ammo for the civilian market soon after. I have had IVI brass with extremely thin necks, brass that blew out the primer pocket, rimfire brass that ruptured, splits and bloopers in shotgun shells, etc. etc. I'd certainly suggest that you do not shoot any of the splitting ammo any more. Especially since a lever action has no way to protect your face and eyes from hot debris blowing back past the sides of the bolt.