.585 GMA Express


#1

Just got a .585 GMA Express. What does “GMA” stand for?


#2

“Granite Mountain Arms” , it is a proprietary cartridge developed by that factory that makes custom rifles.

You can find their website on the web


#3

Pivi–Thank you for the quick answer.


#4

Yea Ron, Granite Mountain Arms is based right here in Prescott Ariz.
In fact the mountain “Granite mountain” is about 5 miles south of where Pete lives in Williamson Valley.
My 2 cents again