The S&W 646 was intended for IDPA competition. Unfortunately IDPA changed the rules as the Model 646 was introduced. That change in IDPA rules basically spelled the death of the 646. I have both the S&W 610 and 646. I use the 610 for steel plate shoots and the 646 for ICORE shoots. With it's light weight I would not want to shoot full power 40 S&W loads in that 646 for any length of time.
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