Bullet ID

[Hogtown Hunter]

I went searching in some woods near an old Fort that was used by US Army in Seminole Indian War and was occupied by Confederates in Civil War. I found a few REM-UMC Sureshot shotgun shell bases that were made from 1926-1949 if I remember correctly. Also found two wadcutter/semi wadcutter bullets that probably are from the same era. But also found these three and wondering how old they may be. The one on the left and middle measure 3/8" and 9mm. Both have a little bit of concave base. The one on the right is a little over 1/4" and 8mm. Has a flat base. Thanks for looking and appreciate any info you may have.

 

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[mirage83]

First two are full metal jacket pistol rounds, think the 3rd one is as well. Say anytime from the late 19th century to now.