I think that shotgun shooters tend to slap the trigger more than rifle shooters. At least for me the trigger slap that I have came from the shotgun side.
Slight drift mode on:
For many years I shot live game brids in field trial compitions, the bird dog kind. I had to be aware of two dog handlers, two dogs, and three judges on horse back. The bird field was about 100 yards square, with all off these "no shoots" all over the place. I used a quick mount/slap the trigger/spot shoot technique I came up with. I had to NOT sweep any off the "no shoots", no prep, no follow through. Oh by the way the dog handler allways wanted a dead bird in the air. A fair amount of cash (calcuta) and income for the pro dog handlers was on the line.
Drift off:
For good or bad that is where my trigger slap came from.