257 __________ ? name this wildcat

Looks like a 6.5 prc case possibly saum parent, but looks to not be rebated. So I'm think prc, shoulder bumped back to 40° shortened up a bit, basically what the Sherman short mag tweaks were done to the saum. I could be so far off base it's not even funny. I'd call it the 257 Maverick!
 
If that picture is an actual picture of it, I'm going to guess it is a necked down 7mm SAUM with the body shortened .100".
 
The problem is I need the info so I know if I am building a 25 sst or a 257 Maverick. (seems like a good name)
 
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