Small bore vs pistol caliber

[brybenn]

Theres a cartridge called 41 great lakes as well. Some interestingly shocking ballistics

 

[Longwalker]

.221 Fireball seems to be ideal for your pupose.

 

[Sights4Nights]

7.62x25mm

 

[mattgoulding]

7.62x25mm

I had that on my radar also