Help identify this mystery rifle magazine

[Rolando]

This mystery magazine has an opening on the bottom and the top.
Maybe it is technically a clip?

Has no markings other than 308 and .243

Anyone know what rifle it fits?

 

[Rolando]

 

[Otony]

I "think" it is missing the floorplate, but that is just a guess on my part.

 

[Wildbillz]

I am making a guess but it sort of looks like one for a Win leavor action I saw. I want to say a mod 88?

Like I said just a guess though
WB

 

[GCBurner]

I believe you're correct. It is missing the magazine floorplate, though.
http://www.gunclips.net/wimo884rdgun.html

It's pretty much the same as the mag for the semi-auto Winchester 100, I think both of them came in both .308 and .243, as well as .284. The front part of the follower should have the model number stamped on it. I can see part of it in the first picture, but can't read if it's M-88 or M-100.