I do like the oddball cartridges myself.... I have owned guns in:
20 VargTarg
222 Remington Mag
25 Souper (308 necked down)
7mm TCU
9.3x74
405 Winchester
I currently have guns in these not so common calibers:
17 Remington
221 Fireball
222 Remington
300 Whisper (shoots 300 AAC Blackout also)
6x45 (223 Rem necked up to 6mm)
260 Ackley Improved
338-06 Improved
41 Remington Magnum
45 Super
20 VargTarg
222 Remington Mag
25 Souper (308 necked down)
7mm TCU
9.3x74
405 Winchester
I currently have guns in these not so common calibers:
17 Remington
221 Fireball
222 Remington
300 Whisper (shoots 300 AAC Blackout also)
6x45 (223 Rem necked up to 6mm)
260 Ackley Improved
338-06 Improved
41 Remington Magnum
45 Super