OK, squib load, goes off bang, but does not burn all the powder, then when the powers exits the end of the barrel, more oxygen and then that residual powder goes off bang, sounds like a slow double.

Wonder if the wad twisted when it was loaded?

Mike

p.s. another thought, maybe this is a base wad that did not get punched for the flash hole.

Last edited by skeettx; 11/20/17 08:02 PM.
USAF RET 1971-95 [Linked Image from jpgbox.com]