I have three of those New Englanders. Well one is a shotgun, so that makes four counting that. But on one of them I mounted a scope. Yep! A scope. And I am shooting 50 yards with some amazing round ball accuracy. My load is 85 grains of powder and since two are .50 caliber and one .54 caliber I shoot about anything I want.
50 yards off a bench rest it does pretty good. I don't remember why I was shooting so much powder that day. the 1.5-6x40mm scope (the photo was mis labeled.) it wears is one of them illuminated kind. Its got a red lens for late hour shooting in it.
The other ones are not scoped.