Funky .40 range pickups...

[eisenhow]

Has anybody ever seen anything like this? These are pickups after a USPSA match (New Bedford or Harvard). You can feel them with your finger nail. You can really feel them when you are roll sizing. They are definitely reloads. The pattern is very uniform. What kind of sizing die or funky cut chamber could cause this?

 

[bill o]

Some blowback operated guns have fluted chambers, and I've seen this on 9mm range brass as well. Something about helping with extraction, I think.

 

[eisenhow]

Some blowback operated guns have fluted chambers, and I've seen this on 9mm range brass as well. Something about helping with extraction, I think.

Thanks, mystery solved! What a way to ruin perfectly good brass.

 

[drgrant]

Still doesn't answer the question of what gun it is, though..... someone shooting an HK P7M10 at a USPSA match? Nah, almost can't be, not enough flutes.

-Mike

 

[Romokid]

My MP5 clone does that to 9mm brass and I know they make them in .40. I believe mine has 12 flutes. Although I don't think someone would be shooting it at a USPSA match as was mentioned. Firing pin indents on the primer look the same too. Are you sure they weren't fired before the match and just left on the ground?

 

[EddieCoyle]

Is it possible that instead of being left by the gun that just fired them, that the marks are 'left over' from a previous firing in a different gun?

 

[bill o]

The flutes iron out upon successive firing, although you can still tell if you look closely. It's most likely these were from someone shooting prior to the match.

 

[Steve_P]

Possibly from a 2011 limited gun with a Schuemann AET Barrel.
Those have a fluted chamber as well, and are very likely to show up at a USPSA match.

You can read all about it here: http://schuemann.com/Portals/0/Documentation/Webfile_AET_BARRELS.pdf

Steve

 

[Supermoto]

AET are very shallow and do not mark the brass. I can't even see the flutes on mine. But they may have been blasted off

 

[Gammon]

Strange, the fluting doesn't extend all the way to the case mouth. I thought the purpose of the fluting was to allow gas to get between the case and chamber wall. This type of fluting would prevent that.