[Logic n' Reason]

Why are you so focused on a “loud report”?

Because
1. If and when I miss the first shot, I want the perp peeeing in his/her drawers,
2. The very loud shot may bring assistance from neighbors,
3. If I do miss the first shot, I'd rather the perp just left...speedily to be sure!

I believe it was the shotgun owners who say that the sound of chambering a round in a shotgun is a great deterent to the would be thief/murderer.

[rhoda_penmark]

“I believe it was the shotgun owners who say that the sound of chambering a round in a shotgun is a great deterent to the would be thief/murderer.”
That effect is known informally as the “pucker factor”.