Gold bullets.

Heavier and softer than the current choice, gold would be closer to lead in destructiveness as a rifle round, maybe 30% to 50% more damage per shot. Because of it's relative rareness, the expense of a gold round would have to be carefully weighed. Late game, I carry the hunting rifle for its ability to fire 6 shots and the bolt action for its greater accuracy: I would want gold in the bolt action to stop the bear to limit how often I have to use the hunting to stop it once it charges. Also, might we have a T4 scope for the bolt action so kill shots are more accurately made at great range?