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Old September 28, 2008, 06:51 PM   #14
Clark
Senior Member
 
Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 4,678
I have built plenty of Mausers.
I have overloaded plenty of Mausers until the bolt had to be pounded open.

I can see three possibilities:
1) The receiver lugs have set back, so the bolt lugs are in a hole after firing. The brass lengthens and traps the bolt lugs. The bolt lift does the work of pushing the shoulder back on the brass.
2) The chamber is horribly misshapen.
3) The ammo is way overloaded. Mauser case heads can be rated from 35k [8mm] to 65k [270], but they all have the same strength: 62kpsi for long life. If the handloaded ammo is ~75kpsi, the bolt will be hard to lift.

Notice how none of the possibilities were caused by the bolt?

1) If you could come over to my house, the Mauser junk yard, we could pull the barrel and measure the distance from the large ring to the bolt face as we open the bolt. It should be a monotonically increasing function [ever take calculus?]. If not it is the receiver.

2If the receiver is bad, we have to lap out the lugs.
If it is good, we need to check the chamber.
We can do a concentricity check on the fired brass or a concentricity check on a Cero Safe casting impression of the chamber.

3) If the handloads are too hot, the primer pockets will allow for very easy insertion of the next primer.
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