Favorite odd ball caliber

[yeti]

Not an oddball, just not often encountered; .348 Winchester.

 

[JRI]

8X56R Hungarian
30 Herrett
357/44 Bain & Davis

 

[leatherneck448]

7.5x55 swiss

 

[RonE]

.30 US (30-40 Krag)
5.6 X 50R (3mm longer case than the .222 Rem Mag)
.30-338 Win Mag (Americas answer to the .308 Norma Mag.)
.22 Rem Jet (The POS experiment with the Mod 53 S&W revolver)