Bloopers can be caused by many things
defective primer, bunched powder, torn wad skirt, powder
leaking past wad skirt, too little powder, wrong burn rate
powder for the application, blocked flame hole in hull, etc.

I have even seen bloopers caused by colder weather.

Hope this helps
Mike

Last edited by skeettx; 10/15/18 03:04 PM.

USAF RET 1971-95 [Linked Image from jpgbox.com]