We've all seen those cop movies from the 80s, right? The ones where the good guys have a S&W Model 19 with 4" barrel. We get that image stuck in our mind as an ideal revolver. Anyway that's how it happened with me.
The K-frame is a fantastic design, as long as you know its limitations. That's right, not only do you have to know your limitations, you also have to know the limitations of your gun.
There's nothing wrong with shooting .357s from a K-frame, that's what it was designed for. But you don't shoot in excess, beause it was designed for comfort while carrying it, not extended shootouts where you'd be using it constantly against criminal gangs while on duty, unlike the N-frame and L-frame revolvers. It's essentially a remade .38 revolver.
This can be scary to the young and newly introduced shooters, but after a while you mellow out and think "just don't go full drive all the time and everything will be fine", and that's how it is.
You can fire 158 gr .357s from your K-frame and it'll hold up fine.
You can fire 125 gr .357s from your K-frame and it'll hold up fine, just not as well as it would with the heavier rounds.
You can fire any manner of .38s from your K-frame and it'll likely outlast you and not need any significant parts replacement anytime soon.
You can practice with .357s, and not worry about your gun blowing up, but you'll need more maintenance work done later on down the road if you use them continually.