I've had a similar problem
The gun in question is a S&W M13 I used to carry in the Border Patrol. The short version is I stretched the top strap and there's too much cylinder gap.
The gun started by 'spitting' sideways. Guys wouldn't shoot next to me on the range after while. However, that extra cylinder gap sure made the revolver shoot accurately. As the problem continued, I was getting 'back bounce' debris as the burning powder was hitting the face of the barrel around the forcing cone and deflecting back at me.
That revolver is retired now. I shot a lot of ammo through it, including a fair amount of .357 Magnum ammo for various purposes - practice, qualification, ammo testing, and just plinking.
However, that revolver had 'issues'. Revolvers in proper operating condition should not do that to any great degree.