Can You Guess the Fault of This Short Action Casing?

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I found three of these cases at a range and I am very curious as to what happened. They are 300 Remington Short Action Ultra Mags and very rounded at the shoulder if you ask me. Primers are not flattened. I need answers because I am want to know. IMHO they look like they were shot out of the wrong gun. If it is so the guy is lucky.

1. Is it Headspace?
2. Wrong Caliber to shoot?
3. Failure to resize Casings?
What gives?

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Either excessive headspace or WAY too hot of load.

The locking lugs/extractor are probably hurt on this rifle.
 
My best guess is that those .300 RSAUM rounds were fired in a rifle chambered for the .300 Winchester Short Magnum by someone who didn't know what they had, both cartridge and rifle.
 
I found some similar to these the other day at the range. One of the guys that was still there, said someone shot them out of the wrong rifle. Boy, was he surprised.

Navy Vet & SWIFT Boat OIC
 
I would have said it was a weatherby or fired in a bigger cartridge gun. Definitely the wrong sized chamber.

I hate to think what they did to the chamber walls.
 
The case on the right does look like it came out of a Weatherby chamber, but the .300 Weatherby Magnum is much longer than the SAUM. Headspace and then some. Case diameter would have been a problem also. Must have been fired in a WSM and I'd agree with dcloco, the locking lugs are definitely hurt, hopefully the shooter wasn't.;)

It also looks like you oriented them in the sequence they were fired in from left to right.
 
CZ57 Quoted:
It also looks like you oriented them in the sequence they were fired in from left to right.
Click to expand...
That was pure luck on how I laid them out. I found them in a trash can and there were only three, some other brass monger got all of the good brass of various calibers and all I got was these lousy!:cuss:
I figured that they would make a great subject considering Short Action Magnums. Read the back of the cartridge. These SA cartridges are coming out a dime a dozen it seems like.
 
Classic example of a case fired in a chamber with the shoulder too far forward. I have two rifles that give me some effects like this. One is an M1905 Ross with the chamber "hogged" out to allow more reliable extraction in the trenches in WWI. It produces shoulders almost like those shown in your picture on the first firing. After careful neck resizing, the slight curve in the shoulder disappears on the second firing.

The other rifle is Bigfoot Wallace, my .35 Brown-Whelen. If you try to fire a standard .35 Whelen round in that chamber, it will produce split shoulders just like those in your pictures. To form cases for that rifle, I use Bullseye powder and a wad of toilet paper instead of a bullet.
 
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