I have used 1644 for my ECW games "since I were knee high to a bucket topped boot" and personally I swear by them (or at them depending on how well the game is going). A couple of local amendments with casualties from shooting being distributed between the pike and shot by the throw of a die on an odds or evens basis and a ruling that Pike and shot must remain in base to base contact and act as one unit unless they are specifically detached ( forlorn hope etc) seems to do it for me.
I am a simple soul at heart !!
Johno