Kris, there is nothing wrong with good quality 357SIG ammo, but marginal/poor quality reloads, of any caliber, can cause problems from function to KaBooms. I've witnessed 9mms/40S&Ws/45acps/10mms and 38Supers rupture and KaBoom...
Anyone who doesn't reload (their own) is far better off to spend a bit more and get the quality. And yea, I have no idea what new ammo costs, because I never buy it, and get my carry ammo for free, but a $100 LoneWolf barrel in 40S&W is a economical way to go, or a 9mm conversion. The 165/1180 grain 40S&Ws will not feel as sharp as a 357SIG.
Wow, 357SIG is expensive, looks like you could make up the cost of a barrel in 500 rounds (which is the cost of a Dillon Square Deal auto progressive loading press, including dies)
on the right, a loaded round with every pull of the handle.... forever. I really don't like reloading, but enjoy the nose the press makes.