Mystery Magazine - Please Identify

[homeboy1]

Does anybody know what this magazine is from? It does not fit in a .7600 but appears to be for a .308 length cartridge. It must be missing the bottom portion. The back end has "300WM" written on it. Thanks for looking.

 

[NB444]

If I am not mistaken that is a Browning mag for a 300 win mag BAR. It snaps into the swing down bottom metal.

 

[cooleyc]

Browning BAR

.300 Winchester Magnum

 

[homeboy1]

Thanks for the information. Once again the knowledgeable membership here comes through!