Michael,
I think the 1 inch Gatling gun bullet is bigger but not sure as all my reference material & notes are in storage.
Someone asked about the 1-ring "Tom Green" bullets. I was involved in a discussion some time ago with someone (Chris Hirch) who stated that he believed the 1-ring bullets sometimes "show a small gap and some show marks they have been fired, thus the small gap developed upon the firing of the projectile, causing the ring to appear.
Someone asked about the "Wishing Well" bullet finds: I know of the 69-caliber French triangular, big 72/73-caliber, the "Greene" Enfield bullet and some round balls (what caliber I do not remember) (this is in a North South Trader magazine issue but my reference is in storage. I personally think it is an extra long Enfield bullet not made for the Greene carbine or rifle as the bullet for both is a flat base short bullet.
These are some recollections without any notes nor reference material.
I hope I did not muddy the water but brought some help.
Tom S.