My takedown version CVA 45/70 shoots several different 300g bullets into 1.5" at 100 yards. Granted, none are sub MOA with any regularity, but nothing over 2" regularly either. I'm just using Lee dies and a Lee factory crimp die.
but maybe you also have a lever action you use them in also.
Why bother crimping? Just curious as don't need too for a single shot