In the old west men didn't wear a belt to hold their pants up. Suspenders if they would not stay up by themselves. Would have a belt buckle if he had a gun belt on. Wouldn't be wearing the buckle in the back either! Yea, I know I'm being picky. Comes on me once and a while. Had it real bad today! This has been a very interesting topic!
Howdy Dr. Bob
Aiming at the buckle to hit the chest, is just a reference point,or just to let you know how much jump there can be in different loads, and different guns will all handle differently, so you need to get to the range and see how they print on paper with the load you're going to use, so you can get the idea of where to aim at, at close range with full house loads, and a 255 gr. bullet your going to have recoil, that big bullet is going to cause it , usually aiming a foot below where you want to hit AT CLOSE RANGE, ( with full house loads ) will get you where you want to go, and I'm sure you know that, but for the newbi, this can be really flustrating, so for you newbi's useing less powder ( less than a full house loads ) and a lighter bullet ( not a 255 gr. bullet ) like a 165 to 200 gr. bullet , will get you more in line with your POA & POI, try some of the different ammo that is available for Cowboy shooting and you will see what I mean, I like full house loads myself, but you need to learn how they work, Cowboy ammo is user freindly, and a lot easier to shoot , so give them a try, I hope this helped.
tEN wOLVES