Pre 64 Model 70

[PWS]

The shape of the front of the extractor is the determining factor. If there is a large enough chamfer it will slip over the rim. If it is cut straight it won't .

...in addition to having enough clearance within the receiver for the extractor to flex far enough off the bolt body to snap over the cartridge rim.

I believe this is why Springfields have the “hump” on the right side of the receiver directly in line with the right bolt lug race. Everything about the design of the 98 Mauser was done for a reason so perhaps Paul Mauser felt it was a better to not allow this clearance for the extractor to flex into and potentially pop off a sticky case?

Ultimately, it is a matter of “some do and some don’t” with more modern designs falling in the “do” category.

 

[WIB3]

I have been collecting and shooting pre64 70’s for many years. They are truly a rifleman rifle. I have never heard of this special loading. Have over 100 of them in numerous calibers and configurations. Never had a problem.

 

[Rdlningcltchdmpr]

The pre-64 Winchester actions were "controlled-feed", meaning that the rims had to be pushed into the bolt lips from the magazine since the bolt head and extractor won't/can't "snap" over them like a "push feed" action. Cost me a long hike back to camp on a Michigan deer hunt when a buddy borrowed a Mexican Mauser .250 Savage (also controlled feed) from me and tried to just push a round into the chamber with the bolt and got it jammed. I was particularly upset because I had specifically drilled that into his pin-head while practicing and getting him sighted in at home! Made him buy his own rifle the next year.

If a person is not Mexican they have no business trying to use a Mexican mauser.