Curious what ammo you carry in your 37?
If I am correct these are not +P rated like the 642 and later J-frames and tend to develop end shake if fired very much with +P. B-C gap on new S&Ws sometimes observed as large as 0.010", causing a 50 fps velocity loss compared to a gun at Mean Assembly Tolerance of pass 0.005 / hold 0.006".
View attachment 14
A 642-1 prior to Hillary Hole. Windage on light frame cannot be corrected by turning barrel without risk of frame damage. Police armorer file-dressed 0.010" off the side of the front sight in the direction the POI needed to move for a 3-inch correction at 25 yards.