All three of your bullets are "unfinished" standard .52-caliber Sharps Rifle/Carbine bullets, from the civil war era. They are not the tie-ring-base (also called "Ringtail") version, because the flared base on that type is much shorter (closer to the bottom of the bullet's main body). See the bullet photo below, which shows an actual tie-ring-base .52 Sharps bullet. Yours are raw out of the bulletcasting-mold, having the casting-sprue not yet cut off the bullet's base. I don't have a photo of a .52 Sharps bulletmold, but the bulletmold in the other photo shows what caused the flared casting-sprue on your bullets.