Have a 1972 vintage square butt model 36. It shoots low with all bullet weights, approx 4" with 158 grain bullets. It also spits back, hard enough to draw blood! Looking inside each chamber with the trigger held back, everything seems to line up. There are also no signs on the cylinder front or forcing cone of shaving. However it spit at least one round of every cylinderful put through yesterday. Was shooting 158 gr. Berry's plated flat point bullets over 4.6 grains of Unique.