Possible projectile fuse ?????

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The item on the left is what I need help on … It is not lead , but I don't know what type of metal it is .. Heavy for size , but not green like brass should be … My thoughts are projectile fuse … second is a Minie ball , weighs 502 grains ; third is a cap off a Hazards Powder can(gun powder); fourth is a gold gilted , two piece button with broken shank … I can make out extra on backmark , but that is about it ….. I found these in the same place as the 1854 and 1840 dimes earlier this week ……. The location is less than a mile from the Mississippi River and there was lots of Civil War activity in the area..... Thanks for looking !!!