Ahh the ''ball and dummie'' - K9 that is certainly a great drill and one we include in NRA courses.
Nice thing about it is - a new or less experienced shooter can be told they are flinching or some fault but when they actually see it for themselves when reaching ''click'' - it seems to enable them to then correct it.
Also of course useful as a regular drill for practice - just as a means of malf' clearance familiarity. Not to be under-estimated.
Made me look at 200 rounds of GD 124+P I got on the net. Lot #'s J29L34 looks like I'm ok.. Thanks for the post!!