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Old 04-09-2012, 07:59   #1
jerzeydevil77
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MG 124JHP Question

I just converted my press from .45acp to 9mm for the 1st time. I have MG 124g JHP to load. My Lyman manual only has data for 125g, and says OAL should be 1.075. I made a few "dummy" rounds, and they seem too short. What OAL do you recommend?
BTW, I plan to use Titegroup powder.
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Old 04-09-2012, 08:30   #2
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I load my 124gr JHP's @ 1.125", and it seems like that's the norm for Glocks.

What's the load for? What gun? For gun games, if you're stuck on TG, 4.0-4.2gr makes PF. I tried that load, and I didn't care for it personally (I use WSF for all my 9mm reloads, including USPSA/IDPA loads).


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Old 04-09-2012, 08:31   #3
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The longest OAL that will feed from the magazine into the chamber. Make a dummy round and walk them down in OAL until you get your number. Then start low and go from there.

JHP is usually around 1.10".
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Old 04-09-2012, 08:34   #4
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I've used 1.060" OAL with a 124 grain XTP (similar profile). The short answer is to load them as long as you can while still functioning in your gun.

If you're trying to get some speed on it, I'd recommend a slower burning powder. I'll let Fred take over on TG bashing from here.

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Old 04-09-2012, 08:52   #5
jerzeydevil77
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Quote:
Originally Posted by Meathead9 View Post
I load my 124gr JHP's @ 1.125", and it seems like that's the norm for Glocks.

What's the load for? What gun? For gun games, if you're stuck on TG, 4.0-4.2gr makes PF. I tried that load, and I didn't care for it personally (I use WSF for all my 9mm reloads, including USPSA/IDPA loads).


.
Fun shooting mostly, I have a 26, 19,and 17 as well as a P239. Not stuck on TG just have 3.5lbs left and might as well use it. I am looking to shoot some IDPA soon hopefully though.
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Old 04-09-2012, 09:05   #6
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I guess stuck with TG would have been better for me to say. Yeah, I'm in the exact same boat, 3.5# of TG on the bench with nowhere to go. I can't decide whether to use it, or sell it.

Like the others said, make some dummy rounds to see what feeds in all your guns. I have loaded 124gr JHP's (Precision Delta) out to 1.135" for my GEN 4 G17 with no issues, but I keep them @ 1.125" now.
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Old 04-09-2012, 09:59   #7
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If you have it, might as well put it to use.

I'm just never sure of people's reloading experience, and don't recommend it (or anything fast) for newbies, especially in a high pressure round like 9mm.
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Old 04-09-2012, 13:23   #8
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Quote:
Originally Posted by Zombie Steve View Post
If you have it, might as well put it to use.

I'm just never sure of people's reloading experience, and don't recommend it (or anything fast) for newbies, especially in a high pressure round like 9mm.
For bunnyfart IDPA loads it will work, just not for me, never in my guns. It does make lovely rose fertilizer though.
There is no appreciable diff in load data w/ bullets that are 5gr either way of the data. So using 124gr data for a 125gr bullet sim shape & construction is fine. As noted, forget the book OAL & load to the longest your gun will run. All guns & bullets are diff w/ respect to OAL, always.
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Old 04-09-2012, 13:31   #9
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Originally Posted by fredj338 View Post
For bunnyfart IDPA loads it will work, just not for me, never in my guns. It does make lovely rose fertilizer though.
There is no appreciable diff in load data w/ bullets that are 5gr either way of the data. So using 124gr data for a 125gr bullet sim shape & construction is fine. As noted, forget the book OAL & load to the longest your gun will run. All guns & bullets are diff w/ respect to OAL, always.



Huh, where have I heard this before?


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Old 04-09-2012, 14:07   #10
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Originally Posted by Zombie Steve View Post
I'm just never sure of people's reloading experience, and don't recommend it (or anything fast) for newbies, especially in a high pressure round like 9mm.
It's only High Pressure compared to the Mighty 45. Compared to any other cartridge it's pretty standard pressure.


People load 9mm to major. It's not like it's fragile or anything. You just can't be stupid. TG is a great 9mm powder. Just don't double charge it and expect life to be all pleasant and easy.
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Old 04-09-2012, 18:30   #11
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Quote:
Originally Posted by jerzeydevil77 View Post
I just converted my press from .45acp to 9mm for the 1st time. I have MG 124g JHP to load. My Lyman manual only has data for 125g, and says OAL should be 1.075. I made a few "dummy" rounds, and they seem too short. What OAL do you recommend?
BTW, I plan to use Titegroup powder.
When the reloading manual specifies an OAL they mean to say that this is the shortest OAL that you should load to but you can always load your ammo longer which will reduce the pressure created at the moment of ignition.

I found that loading MG 124gr JHP bullets behind 4.0gr of Titegroup at an OAL of 1.120" gave me good results. This load produces a Power Factor of 135 out of my G34 with good accuracy.

Titegroup might not be the "cleanest" powder available but it offers really good accuracy and a great recoil impulse.
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Old 04-09-2012, 18:48   #12
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The longest OAL that will feed from the magazine into the chamber. Make a dummy round and walk them down in OAL until you get your number. Then start low and go from there.

JHP is usually around 1.10".
Glocks will let you load the MG 124gr JHP longer...but my own experience with this bullet in my Glocks is that it's much more accurate when loaded shorter. I suggest 1.105" give or take 0.005".
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Old 04-09-2012, 18:57   #13
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Glocks will let you load the MG 124gr JHP longer...but my own experience with this bullet in my Glocks is that it's much more accurate when loaded shorter. I suggest 1.105" give or take 0.005".
You make a good point. OAL will have significant impact on a particular pistol's accuracy.
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Old 04-09-2012, 19:52   #14
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Who am I to argue with Fred, but I love Titegroup for the 9mm. I use it behind 124gr Precision Delta FMJ. Just loaded up a bunch for this weekend's indoor Glock shoot. In my G17 I load at 1.134 OAL and use 4.2 grains of powder. (verify this at your own risk, standard disclaimer). It is really accurate and works great.
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Old 04-09-2012, 21:49   #15
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Glocks will let you load the MG 124gr JHP longer...but my own experience with this bullet in my Glocks is that it's much more accurate when loaded shorter. I suggest 1.105" give or take 0.005".
I haven't done a ton of 9mm reloads (3,000-4,000), so I'm really interested in this. What other OAL's have you tried with 124gr JHP's? When you say "much more accurate", how much are we talking? How did you end up at 1.10"?
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Old 04-09-2012, 22:58   #16
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Quote:
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Glocks will let you load the MG 124gr JHP longer...but my own experience with this bullet in my Glocks is that it's much more accurate when loaded shorter. I suggest 1.105" give or take 0.005".
Yes, Glocks will feed longer, but my best result is with 1.10 OAL. I load FMJ to 1.125 and JHP to 1.10.
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Old 04-10-2012, 04:46   #17
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I load all my glocks to 1.125 OAL
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Old 04-10-2012, 08:18   #18
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My load for MG 124JHPs:

Mixed brass
Win primers
4.2 gr of Win 231
OAL = 1.1

Works well in all of my 9s.
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Old 04-10-2012, 17:39   #19
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I've loaded them to 1.120 and 1.130 and was never really happy with the group sizes I got. More recently, I loaded some to 1.108 and was pleasantly surprised to find them grouping quite well. It could be the OAL or it could just be the resulting higher velocity caused by the reduced case volume. I haven't done enough testing to know. But don't really need to know. I'm happy with 1120fps from 4.3gr Universal.


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