I got several from Sarco or somewhere similar in the 1980s and didn't have any trouble with them, even on an 8.5 or so lb. .338-378. They told me they were for a commercial production rifle (Parker-Hale) with Mauser action. Is this the same one you are discussing? BTW, I still have one with the box cut off, intending to use a custom sheet metal longer box with it (which I also have). Anyone need it?
