Don't ask me why, but I have three of them. Two 50's and a 54. I also have some New Englander's. The BMM replaced the New Englander's forward tang mounting wood screw with a modest thru-bolt that screws into an additional tapped hole in the trigger guard. I tried minnie balls in my 54, but had to load it way down to stop blowing out the skirts. I'm guessing they did not like the QLA? All of mine do like maxie balls over 100gr of Pyrodex RS. We have found this load to be very effective on deer. And we use the #11 percussion caps. Good luck with your gun!