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On 45 LC.. #16652650 11/24/21
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OldmanoftheSea Offline OP
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a point of curiosity.
In comparing WW 45 LC cowboy loads with recently acquired UMC 45 Colt with original "U" marked primer i notice That the casong length and rim design differ significantly with the UMC brass being about a quarter inch shorter and having no groove forward of the casing rim...
When examining the cylinder chamber of a 1909 pattern revolver I see a head spacing(?) Rim towards he front of the cylinder. Clearly the UMC will not rest on this rim. The SAAMI diagram shows a min-max spread of casing length of only 0.075"...
any advice?


-OMotS



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Re: On 45 LC.. [Re: OldmanoftheSea] #16653033 11/24/21
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Z
zcm82 Offline
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A lot of antique cartridge brass is a bit different than original spec now. Most have a bit of extractor groove that the original form didn't have, and the rim/head area is a bit different since they're not balloon head brass anymore.

45 Colt headspaces on the rim, nothing forward of it. Those grooves in the cylinder may be for headspacing 45ACP using clips, if what you're describing is what I'm picturing as a little lip in each chamber.

Last edited by zcm82; 11/24/21.
Re: On 45 LC.. [Re: zcm82] #16655787 11/25/21
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OldmanoftheSea Offline OP
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Originally Posted by zcm82
A lot of antique cartridge brass is a bit different than original spec now. Most have a bit of extractor groove that the original form didn't have, and the rim/head area is a bit different since they're not balloon head brass anymore.

45 Colt headspaces on the rim, nothing forward of it. Those grooves in the cylinder may be for headspacing 45ACP using clips, if what you're describing is what I'm picturing as a little lip in each chamber.


that sounds right..

it just seems odd to have brass so much shorter..


-OMotS



"If memory serves fails me..."
Quote: ( unnamed) "been prtty deep in the cooler todaay "
Re: On 45 LC.. [Re: OldmanoftheSea] #16690380 12/05/21
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Reloder28 Offline
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Nominally shorter is perfectly acceptable in a revolver.


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