Just bought a 7 1/2" super blackhawk and I'm getting "fair" primer strikes.The strikes are not quite as good as my other single actions.May be a weak mainspring or something else?Anyway,will it hurt to install a slightly heavier mainspring without damage to the firing pin?Have not shot any speer ammo through it so may try that.I guess if it shoots the speer with no problems it's probably alright but just thought I'd put a heavier spring for assurance.My other five supers put a very good indent(sp?) on the primer as well as my blackhawks.The ammo was federal american eagle.Also,I'm I correct in thinking that the factory mainspring is 24lbs? Now that I think about it,previous owner could have replaced the factory with a lighter spring.