.45 LC Bore Diameter
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Thread: .45 LC Bore Diameter

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    .45 LC Bore Diameter

    Can someone who has this off the top of their head, share with me what the bore diameter measurement should be for a 1st Gen .45 Long Colt? I assume it should be measured at the barrel inside the frame?
    Thanks,
    Jim
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    sumthin_nu

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    From the webz:
    "Prior to World War II, the .45 Colt used a groove diameter of .454"; post-WWII production adopted the .452" groove diameter of the .45 ACP. From 1924 through 1940, a small number of Single Actions in the pistol caliber .45 ACP were produced. Colt's record lists several Single Actions chambered for the .45 Colt cartridge and being accompanied by an extra cylinder for the .45 ACP.[37]"
    Member MLV will most certainly know...nevertheless, .451/.452 bullets should be safe to shoot in all generations, but accuracy 'may' suffer, or it may not.
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    Thank you. I am not concerned about which bullets to shoot, but rather what the diameter of the bore was supposed to be in a pre-war SAA. I think you've given me that, and I appreciate you!
    sumthin_nu

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    I think 1st gen bores were .454. 2nd and 3rd are .451.
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    Quote Originally Posted by sumthin_nu View Post
    Can someone who has this off the top of their head, share with me what the bore diameter measurement should be for a 1st Gen .45 Long Colt? I assume it should be measured at the barrel inside the frame?
    Thanks,
    Jim
    1873 to 1910 the bore dia was 0.451" (these bores are more hexagonal than round, between the narrow lands). After that it was increased to about 0.453" with round segments between wider lands.
    Last edited by victorio1sw; 02-05-2020 at 06:07 PM.
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