Thank you for posting the better pictures. Looks to me like surplus flattened ball powder of some type, now only good for starting campfires or lawn fertilizer. I think enough has been said about what to do with the rest, but this rule is what I go by: "Never use reloaded ammunition not assembled by you, either commercial or home-brew, and always verify the source and quality of any factory new ammunition before using it in your own firearm. Use only that ammunition specifically designed for the particular firearm".