Winchester 320 scope ring info

[CzechSF]

Am I suppose to buy the 3/8 tip off mounts?
The groove in the scope rail measures 0.4050 on my caliper.
I can't find the info anywhere, even called Winchester and they don't know.
Thanks

[RawHP]

I don't own one, but perhaps this would be of help:

http://www.rimfirecentral.com/forums/archive/index.php/t-379600.html

[CzechSF]

I read a lot of threads but somehow never came across that one.
Looks like its the 3/8 tip off mounts.
Thank you!