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Joined: Dec 2019
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Campfire Outfitter
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Joined: Dec 2019
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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
"If memory serves fails me..."
Quote: ( unnamed) "been prtty deep in the cooler todaay "
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Joined: Sep 2021
Posts: 2,233
Campfire Regular
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Campfire Regular
Joined: Sep 2021
Posts: 2,233 |
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.
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Joined: Dec 2019
Posts: 12,212
Campfire Outfitter
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OP
Campfire Outfitter
Joined: Dec 2019
Posts: 12,212 |
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 "
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Joined: Mar 2006
Posts: 19,272
Campfire Ranger
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Campfire Ranger
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Nominally shorter is perfectly acceptable in a revolver.
”Every citizen a soldier.”
Thomas Jefferson
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Joined: Jan 2010
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Campfire Regular
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Campfire Regular
Joined: Jan 2010
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Shorter doesn't really effect anything much in a revolver chamber.... to a limited extent. For instance shooting 38 specials in a 357 magnum. However, do it long enough with hot loads and you can get a burned ring in the cylinder where the case ended.
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Joined: Aug 2022
Posts: 145
Campfire Member
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Campfire Member
Joined: Aug 2022
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Buy some half moon clips and you can shoot those 45acps.
Last edited by oldtimr1; 09/07/22.
The more I get to know people, the better I like dogs, life is short, eat dessert first.
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Joined: Feb 2009
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Campfire Tracker
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Campfire Tracker
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Buy some half moon clips and you can shoot those 45acps. Bull!
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