Well I got the Lightning and took it out to do some shooting. It has the 11 breechplug so thats what I started out with, first thing I notice is how hard the 460grn 504 bullshops are to load in the barrel. The barrel is stamped 504 just like the UM's but the bullshops load like a dream in the UM's. I read a post on DWB about a guy that could not get his 504 460grn down the barrel because it was so tight. So its loaded and primed, I get the sights lined up and pull the trigger and there is about a 1/2 to 1 second delay until it fires after the bolt hits the caps. Now the powder is only 1 week old and the primers are brand new. This combination works incredible in the UM's. So I load it up again and same thing. Now I'm starting to get frustrsted. So I decide to replace the spring that came with the gun back in 95 with one from my UM and try it again. This time you can hardly tell there is any delay but there still is a little. So I decide to try the musket breechplug from my UM. This time it is instant ignition. So are the other 12-15 shots. So I need to order a new spring, and I think I will stay with the musket breecplug. As to how it shot on paper well once I got itdialed in I was shooting less than 1/2 inch groups at fifty yards andat 75 it opened up to about 3/4 inch. I was shooting 70grns of P and 75grns of RS both with a TOTW wad. So needless to say I was pretty impressed with this short and light gun.