Reloading 9mm Frontier 124gr CMJ RN

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greenhorn

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Hi All,

I'm in need of some assistance. New to reloading and want to load some 124gr CMJ bullets to shoot out of my CZ SP-01. I'm using WSF powder with WSP primers. The problem I have is Winchester only has data for 124gr FMJ and 124gr Lead RN. Am I able to load CMJ bullets to FMJ weights or should I use the data for Lead? My other question is Winchester gives a COL of 1.169" for both powder/bullet combinations but my chamber is too short for this length. If I reduce the seating depth to 1.150" or even 1.135" am I going to create a pressure problem?

The data I got was from the Hodgdon website. I haven't reloaded any yet as I'm waiting for my manuals to arrive. Any additional help in the meantime would be appreciated.

Thanks.
 
I beleive winchester manuals always only state the Max OAL. I am shooting montana gold 124gr RN with 4.4gr win231 @1.130" COL . If you look in the lee manual it shows the Min OAL with 231 @1.095 and other manuals state what OAL the loads were tested at.

The lee manual states using 124 jacketed bullet and Win super field= 4.7gr start -5.3gr max ,min OAL 1.095

hope this helps
 
Thanks BCboy... Right on the money. I was looking for a min AOL that would be safe to load. I think I'll stick around the 1.135-1.150 range. At least knowing the min OAL gives me some room to work with.

What about loading CMJ to FMJ charge weights? Is That OK?
 
What about loading CMJ to FMJ charge weights? Is That OK?
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only if the the max load for lead is the same (or higher) as the FMJ load! So the short asnwer is NO. But you can use a starting FMJ load. I think with copper plated bullets it's recomended to use 10% below the max FMJ load.

Although with some powders lead and FMJ bullets use the same (or nearly the same powder charge) so what I do is look at both lead and FMJ load and use a charge in between the max lead load and staring FMJ laod (they often overlap)
 
Thanks IM_Lugger,
According to Winchester the starting load for FMJ is 4.7gr to a max of 5.3gr WSF. The starting load for lead is 4.0gr to a max of 4.7gr WSF. So would it be safe to say if I stay between say 4.5 to 4.8gr (10% of max FMJ) I should be OK.
 
Thanks IM_Lugger,
According to Winchester the starting load for FMJ is 4.7gr to a max of 5.3gr WSF. The starting load for lead is 4.0gr to a max of 4.7gr WSF. So would it be safe to say if I stay between say 4.5 to 4.8gr (10% of max FMJ) I should be OK.
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I've never used that powder myself, but that sounds right....
 
First off thanks for the replies, greatly appreciated.

Well my Lyman 48th edition arrived in the mail yesterday...Opened it up to the 9mm load data section and to my dismay NO load data for the bullet weight or type (124 gr RN FMJ or CMJ) that I wanted WTF:mad:. Well at least there was some data for 147 gr TMJ.

Think I'm gonna try to get the Latest Lee reloading manual....See if it has more data.
 
What about loading CMJ to FMJ charge weights? Is That OK?
Click to expand...
IM_Lugger said:
only if the the max load for lead is the same (or higher) as the FMJ load! So the short asnwer is NO. But you can use a starting FMJ load. I think with copper plated bullets it's recomended to use 10% below the max FMJ load.
Click to expand...

It almost sounds like you're talking about steel jacketed bullets or something. :confused: A CMJ bullet has no exposed lead so why would it have to be loaded lighter than an FMJ?

Here is a photo and some verbage from Dansy taken from this thread:
http://www.canadiangunnutz.com/forum/showthread.php?t=134455

Dansy said:
Left one is FMJ(my picture......the FMJ does have lead exposed. next is a CMJ next a IFP and finally a JHP....

DSC00080.jpg
Click to expand...
 
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Originally Posted by IM_Lugger
only if the the max load for lead is the same (or higher) as the FMJ load! So the short asnwer is NO. But you can use a starting FMJ load. I think with copper plated bullets it's recomended to use 10% below the max FMJ load.
Click to expand...

It almost sounds like you're talking about steel jacketed bullets or something. :confused: A CMJ bullet has no exposed lead so why would it have to be loaded lighter than an FMJ?
Click to expand...

He's talking about Frontier bullets which are copper plated and not true CMJ bullets.

With 'real' CMJ bullets it's OK to use FMJ load data...
 
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Well, It's been a couple of busy weeks experimenting and shooting. Here's what I've of come up with. My CZ Sp-01 likes frontier 124gr CMJ RN over 4.8 grs of WSF powder at an OAL of 1.125". I used Winchester brass and primers. I tried lower weights and different lengths, but I found the lower charges seem to leave a black residue on the cases and the 1.125" OAL worked well in my mags with no issues.

Thanks for the replies and helpful suggestions:)
 
if these are frontier bullets i beleive that they are plated bullets. if that is the case they should be loaded to lead specs not FMJ's specs.
 
A CMJ is a marketing name for a brand of jacketed bullet. So is a TMJ. Use data for a jacketed bullet for the bullet weight. Plated bullets aren't the same thing.
 
sunray said:
A CMJ is a marketing name for a brand of jacketed bullet. So is a TMJ. Use data for a jacketed bullet for the bullet weight. Plated bullets aren't the same thing.
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CMJ and TMJ are plated bullets, and NOT jacketed.

CMJ = Complete Metal Jacket.

TMJ = Total Metal Jacket.

TMJ's are made by Speer and I believe that it's a copyrighted name.
 
RePete said:
CMJ and TMJ are plated bullets, and NOT jacketed.

CMJ = Complete Metal Jacket.

TMJ = Total Metal Jacket.

TMJ's are made by Speer and I believe that it's a copyrighted name.
Click to expand...

Hey Pete.....

TMJ is used by Hornaday and Acurra too

CMJ is what MG calls their fully encased JACKETED bullet... They jacket the bottom with a short draw (like a HP but the jacket only goes up the side about a 1/4 inch then they jacket the top of the bullet..

the bullets Dansy is using of MG's 2nd from the left is a CMJ
 
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