I am brand new, and I have only found 2 dropped three ringers, three fired three ringed bullets and a fired sharps carbine. The bullet that eludes me is any bullet but a three ringer, lol! I would love to find a Ringtail, Gardner, Enfield, Washington Arsenal, .44 Colt, Burnside, New Austrian, Belgian, Arkansas Hawg, Mississippi rifle bullet, Salvaged lead, Charleston Hi-base, English Hi-base, Army of Northern Virginia style Selma Arsenal, Selma Lube groove Enfield, .75 Cal. Wishing Well bullet, Enfield Pritchett, Gallagher, Savage Pistol bullet...I could go on and on. Would you like me to stop? :-)
Well

It all depends on where you hunt.
On The "Wishing Well " (I see you have done your research ) I guess you would have to buy those , I've had Won a couple in Club hunts / Raffles I gave 1 to a friend & the other

; They were 'different ' not only in their size & Type but many had powder burn that also made them unique .
Like those who hunt the PA or Gettysburg area , Those Big 3 ringers , Explosive Gardiner 's + regular Gardeners & the Larger cal , "Prussian , Belgian , French etc " are more common.
I guessing the Washington Arsenal types are more abundant in Maryland , N VA , I have never found one here in N Ga , but have see a couple Swaged base types [with star] were found around New Hope & Pickets Mill Ga.
I guess we will have to drive West for our Arkansas Hog , Marshall TX Enfield's & other 'different' W Western theater rounds.
I suppose in Va , W VA , TN , anything is possible , BTW I have never detected in any state but Ga , N Ga at that so i'm going on assumption . The Low Country has interesting types that run the scale same for S NC , I'd put N NC in the VA category
. I'm thinking N of the Civil War fighting .69 & 70? cal balls rule the roost. Ya know Flint lock times ?
Around me anything .69 Cal is Rare ( I've only dug 3 or 4 I think / 3 ringers at that. ), Gardeners are rare here ( I been lucky & have dug 10 or so Drops over the past 6 months all in the same general area ). Here Enfield types are pretty common but I rarely find types with a stamped cavity , ( a couple fired types with a '57' in their bases but I have dug 3 or 4 with the wood plugs still in them & I have not looked for a base mark.
As for carbine & pistol types 'Here' Burnside's don't seem that common anymore (I hear they were more plentiful in the Calvary camp's in the 60's -1980's ) I got lucky on a site with a good bit of those , along with Sharps 'small cone 52's , Sharpe's & Watervliet Arsenal 36 & 44 cal' cones.). The Spencer seems to have played a huge role in the sites I hunt , I find that funny cause I always heard about the Henry Rifle but I've never found a Henry cartridge or bullet

Others here have . A-lot of Sharp's carbine here. I got 3 Ringtail Sharps in 20 years all from different sites . 1 Richmond sharps , just a few 36 & 44 cal Colts , ball's of all sizes .31 or 36 mostly of course . (this late after the War).
I love .54 cal 's of all types ; lately about half the CW bullets I have dug have been fired so drops are nice , that said they are all special to me.
I WANT a nice Dropped or fired Whitworth type , they are around but hiding very well, any Small Cal Tennessee Rifle type , any 'Picket Bullet types' a Nestler or Kerr would be GREAT , Gallagher , Maynard, the same Cool looking Charleston Hi base & Selma Arsenal , Wilkinson & like you many more .
As I stated over an hour ago , I guess a few 'Road Trips' will be needed to dig many of the bullet types we want.
I won't even get into Buttons , Buckles etc, I think most Soldiers were Nude in this Ga Heat. LOL
Keep it up Rusty many of those bullets you want are out there waiting & I feel you will eventually get most , as "You have the Fever" GL