Hello
The 9.1x40mm was an early European Shotshell intended for small game hunting.

There was also a 9mm Centerfire shotshell. Primarily made in Spain

Case dimensions are:
Rim 0.436
Base 0.391
Mouth 0.370
Length 1.750

Closest case that I could think of was the 357 Maximum with a Speer shot cartridge.

Mike

Last edited by skeettx; 01/10/11 08:21 PM.
USAF RET 1971-95 [Linked Image from jpgbox.com]