Joe,
Let me give some of my thoughts on Hunter Pistol Silhouette.
I borrowed a 357 mag barrel several years ago, to decide if I wanted to shoot 357 for Hunter Pistol. I tried it with heavy loads, then lighter loads, then light loads using 38sp cases. My conclusion was that even though it was fun to shoot, in a match where I was shooting 40 to 60 rounds, the recoil was just a little to much. It didn't hurt or anything like that. It was just that in trying to concentrate on hitting the targets, I started anticipating the recoil and missing shots.
I finally settled on a 22 hornet barrel. There is little to no recoil so the anticiaption of the recoil is gone. As an added bonus, it shoots so flat that you don't have to change sight settings from chickens to rams. You can also use a rifle scope and a taco hold where as with the 357 you almost have to go with a pistol scope with eer and use a less steady hold.
To some it all up, you get less recoil, a better scope, a better way to hold the gun, and then there is the cheaper reloading components too boot.
In Hunter pistol, recoil is not your friend. Fatigue is something that will lead to missed targets.
I did get a 357 max barrel for hunting deer and elk. It is fun to shoot as a hunting barrel but I would never want to shoot 40 rounds at a time with it.
Just my 2 cents worth. If you go with a 357 barrel, you will be easier to beat so that will benefit me.
Sixgun