Why I would not shoot an Indian brass blunderbuss.
The very first blown up gun I looked at in the early 1980's was an Indian made Blunderbuss with the breech plug blown out, shooting heavy blanks. Fortunately that plug missed the shooter's face.
When I examined it I saw that the very fine threads in brass barrel and pug were all intact, just a little smearing on the tips of the threads.
So why did the plug blow out?
Those fine threads barely held the plug in to begin with. Specifically the plug O.D. was small, compared with the threaded hole in the barrel's breech. If you don't understand me here, it is because it makes absolutely no sense to you, breeching a gun this way.
But it didn't worry the Indians. It is a cultural thing, having actual practical knowledge of what one is doing. Val Forgett was apologetic, he had no idea that his Indian supplier was doing this.
This was a long time ago. Still, I question that the gun making industry over there has learned from it.
I also question how many readers here know not ever to use fine threads in brass? But rather always coarse threads..
Sincerely, Jim Kelly, your P.I.T.A. engineer.
Since 1963/steel case-hardened and through hardened. steel forgings properly and not properly heat-treated/stainless steel metallurgy/armored vehicles/gas turbine engines in Viet Nam & elsewhere/ all manner of high temperature processing using nickel alloy fixturing/brazing, welding steel & nickel alloys/probably &c