My S&W 617 has seen many, many thousands of rounds down the 6" tube, most in competition at a winter league in Logan, Utah, it has done very well against the semi autos. My best time for 9 shots, 3 each on 3 different targets is 2.99 seconds. You start out holding your gun on a red dot on the wall. All were A zone hits. A 4" gun would be a better packing gun.
Pheasants hate my 617! Took 3 with a 14" T/C contender in 410, also took 2 with 2 shots using my 617. The red dot is a Leupold/Gilmore.

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Dick