Daryl, I think that you are correct when it comes to military muskets, such as the Brown Bess, Charleville, and Potzdam muskets. The strategy of the era was to form line at 50 paces and have at it, followed by a bayonette charge. The idea was to fill the air with lead, and then there was the old predudice that to aim at a man to deliberately kill him with the shot was murder.
I have had some experience shooting various models of the Brown Bess from the Long Land Pattern (1st model) through the 2nd model and 3rd model or India pattern. The only Bess that you (I) can get my cheek down on the wood to see down the barrel to actually sight, is the 1st model. Later models of the Bess were too straight in the stock, not enough drop at comb or heel, to actually sight down the barrel.
Trade guns are altogether different, as are guns made for the civilian market, ie: fowling pieces, with the exception of the French FDC or FF of Tulle or St. Etienne.