Not sure how familiar you are with flinters so please forgive in advance. If someone is getting a flash......bang then the gun is not loaded properly or/and the gun is not built to its best. Touch hole drilled to low. touch holes should be drilled so the top of the pan splits the opening. Most common the pan is over filled with powder getting in the touch hole. This causes a fuse like burn and slower ignition. Another problem is having what seems to be 50 gal. of rain water collected in the brim of you Jones cap and when you glance down all that water runs all over and though the frizzen and pan, or at the end of the day blowing out the pan only to have a BIG buck at spitting distance blow right back at you.