Necked down 45ACP to 40/10mm

T

Tsquared

New member
A buddy of mine is downsizing. He has sold a couple of his gun reducing the calibers he is vested in. He has also realized he has more ammo that he is probably going to shoot until he turns 90. He has had friends that reload so he has always collected brass and borrowed reloading from time to time for 9mm and 45ACP.

He gave me a 5 gallon bucket of brass with 9mm, 45acp, 10mm, and 454 Casull with a few handfulls of 7.62x39, 223, and 30-30 in the mix. I have been going through it and found something different. It is not a 400 Corbon, the shoulder is higher than the Corbon but I have about 30 45ACP that have been necked down to 10mm. Any ideas what it could be?
 
I think .40 Super has .45 ACP case head dimensions, but the case is the same length as 10mm?
No headstamp?
Triton developed the .40 Super, so I'd expect their name on the brass.
 
I talked to my buddy who gave me the brass. The 45ACP that have been necked down to 10mm were half way through the process. They need another reduction to push the neck further down to 400 Cor-bon but he stuck a case in the necking die. He sold the dies and all of the brass with the gun. I got left with the half way done cases that were left over.
 
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