Glock Talk
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11-01-2012, 14:21
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#1
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Senior Member
Join Date: Nov 2009
Location: Illinois
Posts: 220
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CMJ vs FMJ
I have someone that wants to sell some MG CMJ 124 Gr 9mm pretty cheap.
I have never loaded any CMJ but assume that I can use my favorite 124 Gr FMJ load safely. Am I correct in assuming that I would reload just the same as if they were FMJ?
What is the difference between CMJ and FMJ? I think that I read somewhere a while back that the base is different. Is the base fully encapsulated?
What, if any, are the advantages of CMJ compared to FMJ?
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I don't dial 911 -- I dial G-L-O-C-K using one touch dialing.
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11-01-2012, 14:45
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#2
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Jacks #1 Fan
Join Date: Mar 2003
Location: Lynnwood, WA
Posts: 5,679
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CMJ just as you stated fully encapsulated, FMJ has an exposed lead base.
Advantage of CMJ loads is less smoke and chance of lead exposure.
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Glock 3rd Gen G19/G34, 4th Gen G17 FDE, G26,
Dillon XL650 & Super 1050B BLUE Kool-aid drinking team member
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11-01-2012, 15:54
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#3
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Senior Member
Join Date: Nov 2006
Location: Florida's Left Coast
Posts: 6,318
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Right now I am using MG bullets exclusively; among them 147 CMJ and 230 CMJ. I have had great performance as for as accuracy, and (with my VV powder), no smoke. I've popped a few of the 230s out of the sandy berm and I think I can buff them out and re-use them. (Just kidding... but except for some minor serrations, they look pretty good.)
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11-01-2012, 16:23
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#4
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Senior Member
Join Date: Nov 2006
Location: CO
Posts: 12,570
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CMJ don't lead the compensator like FMJ can.
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Steve
Yes, I post using a phone so my spelling sucks.
Converting Hornady owners to Dillon
one owner at a time.
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11-01-2012, 17:49
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#5
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reloading nut
Join Date: Mar 2008
Location: N W Washington
Posts: 7,347
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The indoor range I go to in the winter requires CMJ's.
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If a man neglects to enforce his rights, he cannot complain if, after a while, the law follows his example.
Without idiots, there would be no baseline for common sense.
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11-02-2012, 06:51
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#6
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Senior Member
Join Date: Nov 2009
Location: Illinois
Posts: 220
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No one has answered my question regarding reloading CMJ.
Are they loaded the same as FMJ?
Should/can I use my favorite FMJ loading in CMJ?
I assume so but want to make sure.
__________________
I don't dial 911 -- I dial G-L-O-C-K using one touch dialing.
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11-02-2012, 07:15
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#7
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Senior Member
Join Date: Oct 2011
Posts: 3,427
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Quote:
Originally Posted by CaptainXL
No one has answered my question regarding reloading CMJ.
Are they loaded the same as FMJ?
Should/can I use my favorite FMJ loading in CMJ?
I assume so but want to make sure.
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Like everything else in reloading, the answer is probably 'maybe'.
I don't load anywhere near max so I would just use the same recipe. If I were truly concerned, I would back the load off a couple of tenths of a grain and work back up.
I have used some CMJ in 9mm and I don't recall doing anything special.
Richard
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"No matter how cynical you become, it's never enough to keep up." - Lily Tomlin
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11-02-2012, 07:27
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#8
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Mall Ninja
Join Date: May 2002
Posts: 2,130
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Quote:
Originally Posted by CaptainXL
No one has answered my question regarding reloading CMJ.
Are they loaded the same as FMJ?
Should/can I use my favorite FMJ loading in CMJ?
I assume so but want to make sure.
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Same same.
You are good to go.
I load 230 and 115 CMJs with the same powder charge as normal. No difference.
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11-02-2012, 07:36
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#9
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Senior Member
Join Date: Nov 2009
Location: Illinois
Posts: 220
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Quote:
Originally Posted by F106 Fan
Like everything else in reloading, the answer is probably 'maybe'.
I don't load anywhere near max so I would just use the same recipe. If I were truly concerned, I would back the load off a couple of tenths of a grain and work back up.
I have used some CMJ in 9mm and I don't recall doing anything special.
Richard
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I don't load near max either and therefore will use my normal favorite load and watch for any abnormal signs.
Thanks for the input.
__________________
I don't dial 911 -- I dial G-L-O-C-K using one touch dialing.
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11-02-2012, 08:54
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#10
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Senior Member
Join Date: Nov 2006
Location: CO
Posts: 12,570
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Like Hoser, we have tested the difference between CMJ and FMJ in 9mm. They work the same.
__________________
Steve
Yes, I post using a phone so my spelling sucks.
Converting Hornady owners to Dillon
one owner at a time.
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