Why would you want to know the " brisance " of a shotgun shell primer? Just about everyone understands the Fed 209A and CCI 209M are " hot " primers and all the rest are pretty much the same, or, "mild". I've been subbing in the Cheddite primers for Win for years with no ill effects. And, out of the 30 or so different shotguns the only one to pierce a Cheddite primer is my Parker 12ga hammer gun, the right barrel. I would think it has more to do with the shape of the firing pin than anything else. I thank Dogfox for answering a question I had - didn't know what brisance was till now.
