been done a half-dozen times, 22-08 is a prime example (remember, 243 is a necked down 308)
30-30 necked down to .243 (probably wouldn't be too good, but for curiousity's sake I'd like to see how well it performed.
6mm/30-30 and 6mm/30-30 improved with a sharper shoulder
308 necked up to 8mm (may have been done?)
it probably has, but if so it isn't nearly as common as the other two. Thee was an 8mm-06 due to people having bring-home 8mm mausers, but no 8mm mauser ammo, so they switched to 8mm-06. The 338 federal is a 308 necked up to 338, I can't see the 8mm being different enough than the 30 or the 338 to be noteworthy, but sometimes wildcatters seem to make sometning just to have somethign different
You know, a .30-30 necked down to 6mm or 7mm could be kind of interesting
6mm/30-30 mentioned above, and I believe the 7-30 waters is a commercial 30-30 necked down
Conversely, I wonder if a .35 caliber .30-30 would work
35-30/30, old wildcat originally invented to be used in worn out 32-40 and 32 specials that were recut, but needed short cartridges (remember this is pre 308) at relatively low pressures. Matches the 35 remington ballistically
i would neck down a .45-70 to .30 say like a 150 gr
I've never heard of that, but it is following a common tradition of taking a very large parent case (be it a 404 jefferies like the 300 dakota or 300 Rem ultra mag, or the 416 rigby like the 30-378 weatherby ) so sure, why not.
So how about oddball pistol wildcats. I want .32acp necked down to .25 cal
25 NAA
I don't know if it's been done but I'd like to see a 10mm Auto necked to .17.
been done as well
Seems to me that what is left it the world of wildcatting is doing crazy stuff just to do crazy stuff, with the exception of possibly expanding the offerings of bullet diameters that are just recently being discovered/rediscovered, like the 20 and the 17...or bullet diameters that fall right between two existing calibers. I suppose there is plenty of unique wildcats you can churn out if you decide that 30 caliber is too small and 32 caliber is too big, so 31 caliber is the answer, or decide that there is a gap between 416 and 458, and that everyone who goes to africa needs a 437!