Can I use .40 S&W in my T/C 10mm barrel?

Discussion in 'General Handgun Discussion' started by hsure, Jun 8, 2010.

  1. hsure

    hsure New Member

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    I have a 10mm barrel for my single shot Thompson Center Contender and was wondering if I can use .40 S&W ammo in it. I know the S&W 610 revolver in 10mm can also use .40, but clips are required to hold the rounds in place.

    I couldn't find any info on the T/C website.

    Thanks in advance,
    Hank
     
  2. skullcrusher

    skullcrusher New Member

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    Hank,

    First, I can't answer your question with any amount of real knowledge about the T/C Contender. What I can say is that I'm sure someone here will know for sure. I just offer the congenial check with the manufacturer kinda thingy.

    Second, it is very common for new members to stop by the Introductions thread and let the members here to get to know them for a bit.

    Third, I am very curious as to the answer to your question as well. I know that many single shot firearms in recent years have been centered around multiple calibers in order to broaden the interest. :D
     

  3. danf_fl

    danf_fl Retired Supporter

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    I could be wrong, but I think it has something to do with the way it uses the case mouth being used to hold the cartridge in place. Remove the barrel and drop a .40 in and see if it goes too far in to be hit by the firing pin.
     
  4. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Just an educated guess here, but you would be forcing the extractor to provide the head space. Rimless handgun cases headspace off the case mouth. Because of the length differencethe .40 will not headspace properly. The extractor will hold the case (probably), but will allow too much slop. When the cartridge is fired, the firing pin will force the case forward until stopped by the extractor. The expanding gasses from the powder will force the case back against the breech face with considerable force. Even in a strong action like the Contender, this is not good.

    In the 610 Smith, the headspacing is actually provided by the moon clip.
     
  5. masterPsmith

    masterPsmith New Member

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    The .40 and 10mm headspace on the case mouth. "NO", you cannot use the .40 in the 10mm contender !!!!!!!!!!!!!!


    Jim...
     
  6. Pat-inCO

    Pat-inCO New Member

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    Excellent answer!

    Yes, you - can - do it, but it is NOT a good idea.
     
  7. hsure

    hsure New Member

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    Thanks for all of the info!

    Thanks for the useful info -- I guess I won't be trying the .40 in my 10mm barrel.

    BTW the reason for this question was that I sold my Ruger P94 and have 750rds of .40 left. And now I'm debating whether to get a Glock in .40 or 10mm. Decisions decisions.
     
  8. ScottA

    ScottA FAA licensed bugsmasher Lifetime Supporter

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    10mm ammo will cost you at least half again as much as .40

    Unless you have a specific reason for the extra oomph of the 10, I'd stick with the .40 for a primary firearm.
     
  9. WDB

    WDB New Member

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    It's possible but as already expressed I wouldn't do it. If you look on sites like gunbroker you can find a 40 S&W barrel for your TC for a reasonable price (less than $200). half the fun of owning a TC is all the barrels you can add for different uses.