best signs of "overpressure"

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“I'll bet this guy never saw or felt this coming’ I have a bolt identical to the bolt pictured in the “I'll bet this guy never saw or felt this coming” lugs sheared off, nothing before, then all of a sudden and at once it lay in a heap, no warranty, warranty was gone long before the bolt face was opened, the third lug worked and we should all give thanks to Paul Mauser, rather than draw conclusions I decided there was no set back or compression so I considered it was sudden shock, something like ‘BG’ instead of ‘baaaaaannnnnngggg’, yes, something like meets and or exceeds, the BG exceeded the ability of the lugs to absorb the sudden shock.

Reminds me of the reloader/shooter that feed his Weatherby in 300 Win Mag a steady diet of reduced loads, he just insisted he must have feed his rifle a double charge and I do not believe it was the last round he fired that rendered his rifle scrap, I believe it was the accumulation of all the reduced loads that split his receiver, and, no compression or set back, just a pile of parts.

And not all Mauser bolts have one standard.

F. Guffey
 
not all was wasted, I cut the bolt handle off and welded to another bolt body from a VZ24 chambered to 270, a most accurate rifle.

F. Guffey
 
In past threads, when a few folks posted they load "hot" all the time and never have trouble, so us pansies who use load books should just shut up, I said that constant over pressure loads can leave no signs of over pressure until one day something like that pic, or worse, happens. This is not because I am overly smart or experienced. (I claim neither) This is because I believe metallurgists and old experienced experimenters/wildcatters when they talk about pressure and chambers. I do not believe I convinced anyone.
 
There is loading hot and there is loading hot. It is not hot loading that breaks guns, but the pressure curve of some of those hot loads. Not all hot loads are dangerous.

When I got Quick Load, I discovered something interesting: some medium speed powders developed completely different pressure curves in the same application. For example, VV N330 makes a nice gradual curve with 147gr bullets in the 9mm while N340 (supposedly slower burning) is spiky.

Clark, through his experiments, found that certain powders in certain applications are more forgiving than others. Perhaps if Slamfire's subject used Lil'Gun instead of 2400, his gun would still be intact.
 
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