Reboring a New Service cylinder
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    Reboring a New Service cylinder

    I have a 1932 made New Service in .45ACP. I just discovered an extra cylinder in my parts box, also for a New Service .45ACP. My question here, can the cylinder be rebored to .45 Colt, and if yes, leads to part 2. How difficult would it be to get it fitted correctly to have a switch hitting .45?
    "Let courage rise with danger, and strength to strength oppose."
    DeaconKC at surplusrifleforum.com

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    Years ago it wasn't uncommon to see the 1917 revolvers with dual cylinders, usually a S & W.
    I'm not sure as to how practical this would be as the 45 ACP cylinder is shorter at the breech end to accomodate the clips to hold the 45 ACP rounds.
    DeaconKC likes this.
    Ken
    "I like Colts and will die that way"

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    This is what I am trying to figure out, thanks!
    "Let courage rise with danger, and strength to strength oppose."
    DeaconKC at surplusrifleforum.com

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    If you did it like the convertible S&Ws, you'll need to use a different crane like they did.
    DeaconKC likes this.

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    A 45 acp new service cylinder will have excessive headspace because they were made with the intent of using the 1/2 moon clips. If you compare the thickness of a 45 auto rim to a 45 colt, that is what you will be dealing with when the job is done. It won’t be right.

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    Quote Originally Posted by smkummer View Post
    A 45 acp new service cylinder will have excessive headspace because they were made with the intent of using the 1/2 moon clips. If you compare the thickness of a 45 auto rim to a 45 colt, that is what you will be dealing with when the job is done. It won’t be right.
    +1

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    Quote Originally Posted by smkummer View Post
    A 45 acp new service cylinder will have excessive headspace because they were made with the intent of using the 1/2 moon clips. If you compare the thickness of a 45 auto rim to a 45 colt, that is what you will be dealing with when the job is done. It won’t be right.
    The early Colt 1917s did not have a "step" machined in the cylinder and thus required a moon clip because there was nothing on which to seat the cartridge. Later (I don't know the date), the seating step was added so that, other than extraction, the gun works just fine without moon clips. On my 1917, the fired cases fall out by gravity using standard loads. I don't know if Colt changed the head space, or other changes, on the later models without the moon clips.
    I would have to ASSUME that with the later cylinders boring out the step would allow 45 Long Colt to run just fine.

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    This cylinder does have the step in the cylinder.
    "Let courage rise with danger, and strength to strength oppose."
    DeaconKC at surplusrifleforum.com

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    If you reload, 45 Colt ballistics can be achieved using the 45 Auto Rim case.
    My 1917 was converted to 45 Colt but a new cylinder was used, as wellas a later barrel.
    Ken
    "I like Colts and will die that way"

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    I would think if there is no step to the chamber the 45 Colt would chamber but too deep to fire due to the headspace.
    DeaconKC likes this.
    Amat Victoria Curam

    Never buy a gun you'll have to make excuses for later


 
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