kevin c Posted September 24, 2003 Share Posted September 24, 2003 I regularly find 9mm and 40sw once fired factory ammo brass from Speer that looks, for lack of a better description, cupped. A friend of mine speculated that this might be hard extraction bending the extractor rim, but the cupping is symmetric around the primer pocket. I don't think that this is a firearm specific breechface problem because I haven't ever seen this in any other brand of factory ammo case. The brass seems to reload and shoot fine, but I am curious why I see this, and not in other brands of ammo. Link to comment Share on other sites More sharing options...
Paul B Posted September 24, 2003 Share Posted September 24, 2003 I've noticed this on Speer .40's too. Thought it was an optical illusion and shot them anyway. They worked fine over and over again. Link to comment Share on other sites More sharing options...
Duane Thomas Posted September 24, 2003 Share Posted September 24, 2003 Can you define what is meant by "cupped"? Link to comment Share on other sites More sharing options...
Matthew_Mink Posted September 24, 2003 Share Posted September 24, 2003 They are referring to the way Speer makes their brass slightly concave at the base, if I understand correctly. I have been curious also. Link to comment Share on other sites More sharing options...
CSEMARTIN Posted September 24, 2003 Share Posted September 24, 2003 I have a lot of Speer brass in .45 ACP and I have also noticed this 'cup'. Although, I have never had a problem with speer brass. Link to comment Share on other sites More sharing options...
kevin c Posted September 24, 2003 Author Share Posted September 24, 2003 It also seems to vary - some Speer cases of the same caliber don't have the "concavity" in the head. Different production source, may be? But I don't know why it's there in the first place. Link to comment Share on other sites More sharing options...
Guy Neill Posted September 24, 2003 Share Posted September 24, 2003 The concavity on some of the Speer brass is from a particular machine. To date the engineers have been unable to eliminate it on that machine. Other machines, essentially identical, do not leave the brass with the concave head. When first discovered, besides trying to eliminate it, testing was conducted to evaluate the effect on function. No problems were found with the ammunition in functioning, so, at least until they can discoiver and eliminate the cause, the decision was made to allow it as "normal" for that machine. We're not happy it looks that way, but are certain it is cosmetic, and will not cause functional problems. Guy Link to comment Share on other sites More sharing options...
kevin c Posted September 25, 2003 Author Share Posted September 25, 2003 And now we know! Thank you, Guy. Kevin C. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now