Omani barrel.

[Pukka Bundook]

David,

Yes, an air-space/gap between powder and projectile will do it, but it still sounds odd that Ibrahiim has seen quite a few that let go all at the same place, described as the first joint. (Apparently about 1/3 of the way from breech to muzzle) I have no good idea why this should be a consistent place to blow.

Best wishes,
Richard.