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Thread: Slugging a Bore

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  1. #1
    Join Date
    May 2005
    Location
    Salisbury, MD
    Posts
    431

    Default Slugging a Bore

    Any tricks?

    I have a .38 S&W I slugged this morning. I used a 9mm Makarov cast lead bullet that mic'd .367". I drove it through the bore. Not such an easy task, mostly because I was worried the entire time that I would never get it all the way through.

    Anyway, the slug has the rifling imprinted on it nicely and it now mic's .354". The reason for my question is that this is about .010" smaller than I would have expected.

    Any thoughts? Just believe it? Re-do it? Any tips for re-doing it? I just drove it in with a wooden dowel and then pushed it through with a rod.

    By the way, the pistol is a 1911 Colt Police Positive that seems to have been cut down to 2" barrel.

    Thanks,
    Jeff

  2. #2
    Join Date
    Jul 2005
    Location
    Burnet, TX
    Posts
    2,128

    Default

    Quote
    Anyway, the slug has the rifling imprinted on it nicely and it now mic's .354". The reason for my question is that this is about .010" smaller than I would have expected.

    Why would you expect any thing larger than .357?
    I would have started with an unsized .358 cast bullet or made a cerrosafe cast. What is your objective?
    Byron Boucher
    Burnet, TX

  3. #3
    Join Date
    May 2005
    Location
    Salisbury, MD
    Posts
    431

    Default

    My objective is to make a sizing die for my lubrisizer so I can appropriately size bullets for this .38 S&W.

    My understanding is that .38 S&W used a slightly larger bullet/bore than the rest of the .38 caliber family. I've seen the bullets listed as .361" so I may have overstated how small I believe the slug to be.

    edited to correct spelling error
    Last edited by chriskat; 12-31-2011 at 07:16 PM.

  4. #4
    Join Date
    Nov 2001
    Location
    Toledo, Ohio
    Posts
    9,117

    Default

    According to the Dunlap book, S&W bore is .351" bore diameter and .361" groove diameter. There is no information for Colt specs.

    Lyman manuals recommending slugging the bore as there is a wide variation in bore dimensions. This is evidenced by your results. I would suggest slugging again, possibly with the unsized bullet or Cerrosafe to verify results.

    Here are SAAMI specs;

    http://www.saami.org/PubResources/CC...w%20Police.pdf
    Jim H.

  5. #5
    Join Date
    May 2005
    Location
    Salisbury, MD
    Posts
    431

    Default

    Thanks Jim, I was thiking the same. I'll slug it again and see what I get. What I'm getting now seems small even for a .38 special.

    Jeff

  6. #6
    Join Date
    Jul 2005
    Location
    Burnet, TX
    Posts
    2,128

    Default Live & Learn

    Google says, "The .38 S&W is a revolver cartridge developed by Smith & Wesson in 1877. Though similar in name, it is not interchangeable with the later .38 Smith and Wesson Special due to a different case shape and slightly larger bullet diameter."

    I learned something just now. I didn't know that there was a difference in 38 S&W and 38 Special. In the past I just bought a couple of lubricating dies on size and .001-.002 over and tried them for accuracy.

    It would be intresting if you showed us your build. What lubricator/sizer are you using?
    Byron Boucher
    Burnet, TX

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