These two are from a cow moose. These bullets are 200 grain Western Lubaloy bullets from an 8x56 Mannlicher Schoennauer. From what I can determine from the boxes the ammo is 75+ years old.

Two bullets doesn’t make an empirical test but it does give the impression they weren’t brittle.

[Linked Image from photos.smugmug.com]

Chronographs, bore scopes and pattern boards have broke a lot of hearts.