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Old October 14, 2012, 08:48 AM   #1
Doc Hoy
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Join Date: October 24, 2008
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Can anyone tell me....

....the headspace specs on a .45 Colt?

I checked headspace using a case with a rim thickness of .056. I came up with .063 to .064 on an Uberti Cattleman and a Ruger Vaquero respectively.

I think this is within the specs, but I would like to be certain.

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Old October 15, 2012, 02:43 PM   #2
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SAAMI says 45 Colt cartridge rim thickness is .060" +.000" -.011", so .056" is OK, and .45 Colt chamber dimensions say thickness for the rim is .060"-.074", so .063" is OK. I wouldn't worry about it either way.
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Old October 16, 2012, 08:41 PM   #3
James K
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May I ask what the problem is? Headspace is not usually a problem area in a revolver unless someone has replaced or altered the cylinder.

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