Wildcat 30cal .222

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Was going through a bucket of my Grandpa’s old bullet collection and came across a 30cal .222. I thought it was a 300 blackout at first glance and wondered how it made its way into the bucket. I remembered there being a few odd ball cartridges in there and sort of remembered this one. Anybody aware of any 30cal .222 wildcats in the late 80’s early 90’s? Was he just before his time on the development of a 300blk but left this world before it could gain traction?

[BobinNC]

Not a Wildcat but a factory cartridge from France. Abet one with a very short life span.

https://cartridgecollector.net/cartr...-armes-762x35/

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He must have been making them for a friend as this is head stamped .222 REM. I know he didn’t have a rifle that shot this round. Cool to know. Thanks.

[MarshallDodge]

The 300 Whisper was based on the 221 Fireball while the 300 Blackout is based on the 223 case. Chambers are identical if I recall correctly.

https://en.wikipedia.org/wiki/.300_Whisper

I wonder if that is what they were going for with the 222