Most Obscure Caliber?

[Springfield45]

450-577 Martini-Henry.

.577 Snider

7.92x57mm Patrone 88

[ElvenSoul]

I thought 9mm Ultra was rare but Internet search is turning up ammo for sale. Hmmmm.

[highpower]

Nothing too obscure.

Handgun-7.63X25 Mauser

Rifle-7.92X33

[NOTABIKER]

I was given a pump 22 rifle made in 1946 that shot 22 western rim fire. Found ammo at ammo brothers.

[Pablo11147]

Went into a gun shop yesterday and saw all sorts of cool stuff I'd never heard of and they had plenty of 22 lr a bit expensive but not ridiculous


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[Capt.Dunsel]

Gyro Jet , got a few with the pistol from father in law.

30 Reese , necked down 38 spl case to 30 cal.

[IrishJoe3]

After following the TRex round around the web, I found this .950 JDL. https://en.wikipedia.org/wiki/.950_JDJ



Ouch! But none for us in CA I imagine.

Uh. Thats field artillery.....

.950 with 30-06

[Eroland7]

I struggle to find 8x56r for my m95 steyr

[Sky_DiveR]

41 Action Express & 475 Linebaugh are the only obscure calibers I have. Unless you count the 30 HRT & 30 Luger.