I've never shot a 640 so I can't comment on its shootability with .357 but at only 2 oz less than the SP101, I can't imagine it would be too bad. I don't know why so many people complain about the SP101 weight. It weighs only 2 oz more than the 640 which I don't think will even be noticed other than on a scale. I carry mine tucked in my waistband w/o a holster and I forget it's there. It sure as hell weighs less than any mag fed auto I carried. It's not exactly a pocket gun but neither is a 640. The Sp101 is built like a tank and I think the only drawback to them is the limited grip availability compared to S&W grip availability.
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