Took my BC to the range today and tried out my newly installed Pedersoli creedmore tang sight.  I also received a set of Lee Shaver inserts so I had one of them in the Lyman front.  Man, what a difference.  After dialing it in, I was putting them regularly in 1.5" group at 50yds.  Before, I was lucky to get them all in a circle the size of a volley ball.  The cold set in so I didn't try it at 100yds. but I'm sure it'll be quite an improvement.