Actually, the terms "2 rings" or "3 rings" is incorrect. They are in fact, grooves. Although we tend to use common nicknames passed down by earlier relic hunters, bullets such as the Sharps variety have true rings. Raised "rings" would be a more correct (although still a nick name) term, whereas grooves would be a more precise term for the common "Minie ball" we encounter. The term Minie comes from a Frenchman who first introduced the elongated bullet. Thus his name is attached to the projectile we so cherish. As for what you heard at Gettysburg, it is backwards. The Confederate Gardner bullet has 2 rings whereas the Union Minie normally has 3 rings (grooves). However, d2 brings out a very valid point: the Confederacy used whatever was available, and so did the Union under certain circumstances. Both sides imported many arms, including the British Enfield rifle and ammunition. The Gardner bullet, although a true CS bullet, was later discontinued in favor of the "home made" Enfield bullet. You'll find Gardner's all over the Eastern Theatre, but not as common in the West. There will likely never be an accurate answer to how many different bullets were used during the Civil War. Some estimate as many as 2,000 different styles and variations. All I can say is weigh, measure and document your finds. You'll be helping future generations unravel the past. Good hunting, David @ Dixie