Mr Ackley Warren Page and others did a lot of testing military actions back in the 50s and 60s with strength tests and re chambering. Failures of the Lee action evidently involved stretching of the receiver and fracture of the smaller lug rather than blowing the bolt through your face. The no4 was pretty much as good as any. Interestingly the Japanese arisaka actions were way stronger than mauser and Springfield and were virtually indestructable.
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