All Garrett: Ace 250 (two), AceApex, VX-9. Have owned just about every Garrett ever made. First three detecter I made myself, with the first one in 1962.
Take several different measurement around the bullet and give us an average (of at least where you think it’s the most accurate). Bullet has been shot, so there’s been deformation, and it has oxidation/patina. I’m sticking with a .38