My two cents
I see this thread is a couple years old but I feel compelled to respond to fears about both the Smith and the Ruger being too light for comfortable .357 shooting. I own an 11 ounce Smith 340PD, I shoot .357 through it, the recoil is stout, maybe even severe is a good word for it, but it is manageable. Fast follow up shots are not likely, at least I've not perfected any method for fast follow ups.
My point is, the Ruger SP101 at some 27 ounces, is more than twice the weight of the Smith 340PD, I gotta believe shooting .357 through the Ruger is like shooting a .22! I do own a Smith 60 in .357, which is almost exactly twice the weight of the 340PD and I have no problem shooting .357 through the model 60. Any fears about the Ruger being too light a gun for .357 are unfounded unless you are extremely recoil sensitive. The 27 ounce Ruger is a very heavy gun by comparison to the 11 ounce Smith 340PD!!