Help with cartridge identification

[triker]

I just found an old? cartridge from my Dad's stuff. Looks like around a 30 cal. and has headstamp of (P A 17) at the 12,4, and 8 o'clock positions. Anyone have idea of what it is? triker

 

[Jimbo357mag]

Best I can help you with.

http://tractioncontrol.well-regulatedmilitia.org/wp-content/uploads/2013/06/CartridgeComparisonGuide.jpg

http://www.gundigest.com/gun-blogs/books/cartridge-identification-headstamp

http://cartridgecollectors.org/?page=headstampcodes