What cases are these?

[sherrick13]

As usual found at the range. Are they .400 Legend work ups?

They are right at 10mm at the mouth and 50.5mm long.

.308 case

The mouth seems to be rolled/crimped in just a bit.

 

[scott024]

Definitely an oddball size. My first thoughts were 400 Legend but the length seems long. If I went to the trouble of using cut down 308 brass, it wouldn't matter what cartridge it was, it'd be picking it up.

 

[DRC458]

That crimp makes me think they were converted to either blanks or shot shell ... i.e. crimped to hold a wad in place. For what reason ...

 

[bushmaster06]

Could be homebrewed 8.6 blackout brass. You can trim and size .308 and 6.5 Creedmoor brass like you can 5.56 to make .300 blackout.

 

[Bahick71]

I think it would have to be around .45 cal based off the dimensions of .308 brass
Looks.like they had a bullet seated in them. Interesting for sure. maybe some
Secret wildcat that you were not supposed to see.lol

 

[bushmaster06]

I think it would have to be around .45 cal based off the dimensions of .308 brass
Looks.like they had a bullet seated in them. Interesting for sure. maybe some
Secret wildcat that you were not supposed to see.lol

.45 Raptor?

 

[sherrick13]

Finally found this. I think it was a .308 fired in a .30-06.

 

[swampratt]

Buddy shot a 20 gauge bird shot in a 12 gauge and it was kind of quiet.
The above and the 20 in a 12 is not recommended

Makes for very interesting brass though