Snap cap?

[TonyE]

Zwerge beat me to it.

The case is deliberately made shorter than a regular .30 Governemnt calibre case to avoid accidently loading a full power round. The British did the same with the Pattern 1918 adaptor, giving it a lower shoulder than a normal .303 inch cartridge to avoid accidents. See picture attached.

Regards
TonyE

[packin9]

Check this out....International Ammunition Association {iaaforum.org} - View topic - I.D. this .22LR chamber adapter

Thanks a bunch Zwerge! (and Tony) I went to a gun show a few weeks ago and forgot to bring it with me. But I saw a private gun display with several of the Marble's 'adapter shells. I thought that was what I might have but a .22 wouldn't fit. Thanks again! Ron

[bdfish]

I have the same exact one. I was thinking it was
Mosin Nagant 7.62mmx54mmR