"Nothing happened bad in the rifle deal, got that. Lots to say about the relative strength of the action and its gas handling characteristics. Might not always be that way, so why even approach the issue on trial and error; a basic, simple chamber cast might have prevented such, but in hindsight.................... probably not."
Just to put the rifle example to bed:
The rifle in question was a stock appearing T 38 Arisaka, with no indication that any modifications had been done. The round fired was a 6.5x 50mm Japanese, in what turned out later to be a 6.5 x 57 mm chamber.
The re-chamber to 6.5x 57 or as sometimes called 6.5 x Roberts was not marked, but should have been- and is now.
You were not "out of place" making suggestions, since we see the issue differently it is good
that you say what you think.
As to calling into question the way the OP did his test, he said himself that he used pressure to close the toggle, that it would not close without but stopped at resistance. Closing with pressure and the subsequent leverage effect , in my book, negates the accurate assessment of the measurement. So it took no "gumption" on my part to say it was not done correctly- he said so himself when he described his actions.
Like Forrest Gump said, "that's all I have to say about that".
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