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Thread: 686 rifling?

  1. #1
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    686 rifling?

    I'm looking at the rifling of my new 686-6 and the rifling looks to be very shallow. Alot more than any of my other pistols, even the 629. I will say that it looks as if the Bore is kinda pentaganol shaped rather than a true round shape. Is this the case, or have I just been standing over my bottle of sweet's for to long?

    Not real concerned about it, as the thing shoots great! and not a bit of leading even with almost pure lead.

    Thanks for your comments.

    Greg

  2. #2
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    Sounds like it has polygonal rifling, if I understand your description correctly. I didn't know Smith did polygonal rifling. My 686 doesn't have it. I wish it did.
    "It is difficult to free fools from the chains they revere." - Voltaire
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  3. #3
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    Smith changed to EDM rifling a few years ago.
    "A noble spirit embiggens the smallest man."

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    EDM?

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    EDM?

    Electrical Discharge Machining. It is described in this article on Wkipedia. I had no idea that it was being used for rifling. I would expect it to reduce the amount of toolmarking used to associate fired bullets with the barrel from which they are fired. (This is something that cannot be done with hammer-forged barrels, which include all polygonally rifled barrels.)

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    Smith changed to EDM rifling a few years ago.
    I've never heard of EDM being used to machine rifling, but a place in Mesa AZ uses ECM, electrochemical machining. Are you sure you didn't confuse the acronyms?

    ECM is very similar to electroplating, but it's in reverse.
    http://en.wikipedia.org/wiki/Electrochemical_machining

  7. #7
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    You're right, its ECM not EDM. Thanks.
    "A noble spirit embiggens the smallest man."

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    Question

    My 686SSR with one piece barrel, and purchased within the last year, has that new-style rifling. I haven't checked with S&W, but thought it might be hammer forged like some of the European guns. Especially, since S&W has, or at least had, a relationship with Walther.

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