I only ask this question because....I don't know. What would be the minimum impact to set off a bullet? If the trigger pull on single action is 5-6 lbs how much force is actually being applied to the primer when the hammer strikes the firing pin and the firing pin strikes the primer? Max impact most likely varies from each gun/rifle/shotgun. Knowing the max impact is not as important because the end result is.....BANG!!! But I would like to know what the minimum amount of impact is needed to set off a bullet. More curiosity than anything.