Old grump most times I do not shoot those smaller groups. Most times I shoot one handed, and quickly, from a flash sight picture. When I shoot like that at 15 yards I can keep most all of them inside of the 8 ring.
I should note also that I was kind of shaky when shooting. I had to pee like no tomorrow at the last group. I was waiting for a cart to give me a ride to the club house to go to the rest room.
Oh and just for the heck of it I was shootin a couple of gallon jugs of water at 100 yards with my 4 inch Mod 67. Took 3 shots to get on target. The next two punched 2 bottles. It shoots flatter than I would have expected it to.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.