Several years ago I purchased 100 rnds. of 7X57 unprimed brass from Graf & Sons along with several 100rnd. bags of other calibers of brass to use in my various old military rifles after I retired. Recently I opened the bag of 7X57 brass and it is really beautiful!
I decided to load a few rnds. into a stripper clip and check for function; I couldn't get the shells into the stripper clip! I had a few rnds of old Remington 7X57 in my junk box and tried them in the clips and they worked fine; what the heck? I grabbed my calipers and checked the actual diameter of the extractor groove and found the diameter on the Graf shells to be .418 in diameter, while the groove on the Remington shells is .406; twelve thoudandths difference!
I don't know why there is this difference? The Graf Arisaka 7.7mm is .406, the Graf 7.65 Argentine is .406, and the Graf 8mm Mauser is .406. I was confused, so I called Grafs and explained the situation and he promptly told me that since it had been over 90 days since I purchased the brass, there was nothing they could do. I think it was very polite of them to tell me in a nice way that I was screwed and they really didn't want to hear about it.
So I am suggesting to anyone reading this and who is thinking of buying Graf 7X57 unprimed brass that they contact Grafs and find out what the current extractor groove diameter is on there 7X57 unprimed brass; if its .418, you might want to buy another brand.........................