OK...so I have a question for the engineers here, since we've gotten a bit OT on the receiver failure mentioned. What the heck...it's my thread
Bolt thrust/bolt failure was not the cause of Mobucks...
What "percentage"- or "relationship" is there regarding the strength of the female threaded end of the receiver, as relates the the strength of the chamber area of the barrel itself, to contain the pressures generated by ignition?
IOW...when looking at the relative diameter of a barrel at the breech-say 1.2", and the metal removed to create the chamber- it's hard to imagine that amount of steel still needing additional "reinforcing" strength from the receiver.
Here is why I'm puzzled.
Rough dimensions of MN receiver:
Wall thickness: .170
Estimated (female) thread depth for 16 pitch- .06-.07
Leaves only .10 to .110 receiver wall thickness...
Now, I've always thought that receiver "strength" is more related to containing bolt thrust.
So, what is it I'm not understanding as to the relationship of this relatively thin ring of receiver (about a tenth of an inch, or so) and it's importance to containing pressures? Why is it, that the barrel/chamber itself cannot be designed to handle this on it's own?
IOW, hypothetically... if one were able to lock down a rifle barrel-no receiver attached- in a vise, insert a case, then lock up just a bolt with fp against it able to withstand the bolt thrust- detonate the cartridge; what would happen? Would the barrel fail in the area of the receiver threads, because there is no receiver in place?
Sorry about the rambling...but I'm not getting this.