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trying to identify brass - .338 LM wildcat

Hi all,
I picked up this brass at an estate sale, its headstamped .338 Lapua Magnum, but it is clearly a wildcat. Ive see 'lapua improved' and '.338 yogi' but im not sure which this is. I have 48 of them.

338lmai 6.jpg

My main goal is to get it to someone who can use it. Im trying to track down the guy that bought the rifle from the same sale. see photos:
338lmai 1.jpg
 
Is the neck diameter .308? If it is, then that looks like a 300 Awesome case. It’s a.338LM necked down to .308. And quite a bit different shoulder.

Here’s a picture next to a .338LM case. The .338 case is on the right.

6624E69E-44BE-4DDE-9B37-42D735A1D4A6.jpg


Here it is with a 300gr SMK .338 bullet.

9028A907-04C9-4F79-BF42-90790F85B410.jpg


And, what looks like what you have above. And it is .338LM head stamped.

4DED2C59-F0D4-41C6-90E1-696CFC388F66.jpg


Yours does look like it’s a wider neck though.
 
Last edited:
its definitely .338. Not sure what the neck angle is but you can se the pic, i suppose theres a way to measure it. All signs point to .338 Lapua Improved. Will post in reloading components when able.
 

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To me it looks more like the 37 degree shoulder of the 338 LM "Rogue" chamber rather than the 40 degree "AI" chamber.
 

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