9mm 124 MPR

[Jacob Wilcox]

[Mark]

Does anyone have a OAL recommendation for the 9mm 124g MPR bullet?

I’m loading for a Glock 17 and 19 and find at 1.125” OAL the cartridge will not pass the kerplunk test in a factory barrel. Drops fully into my Dillon case gage though.

[Keith]

1.125″ is long for a JHP….

I’m running the 124gr. MPR at 1.075″ That OAL works in all my 9mm guns, regardless of brand. The flat nose requires you to shorten it up a little bit.

[Mark]

Thanks for the feedback Keith.

I settled at 1.080 OAL for my initial test loads. This appears to give me about .012 of clearance in my gen 4 Glock barrels.

I’m going to test a few different powder charges and then revisit the length setting before a run any volume or these.

[George]

I am at 1.115. Works fine in VP9, CZ75.

Just remember, if you go lower than recipe recommends, stay away from max loading as you get more pressure for same powder charge with less space in case.

[tvarden]

Hum interesting. I’m loaded from Nosler data and load them at 1.120. I just checked one of my Glock 19 barrels and you are correct they fail. However I shoot them from a Glock 19 with a SilencerCo threaded barrel and an Omega 9K can and they pass in that barrel.

[Russell Sala]

I had to load them at 1.075 to pass plunk test to run them through my CZ SPO1 tactical.

[Pedro Afable]

1.065” OAL in order to plunk in my Glock 17 Gen 5 barrel. Other 9mm firearms will take longer OALs including other Glocks.

4.2gr Win 231 / HP-38 Avg FPS 1090 SD 5.6 for my all around range rounds.

4.6gr Win 231 / HP-38 Avg FPS 1162 SD 13.2 to get reliable expansion.

[Dean]

With 1.060″ OAL, I could pass the plunk test in my Glock 17/19 Gen 4 barrels, but had to go down to 1.048″ in order to pass in my Glock 48.

I use 5.1 gr CFE Pistol for a good range load, mixed brass with a WSP primer.

I have ran them all of the way up to 5.5gr @ 1200 fps out of my Glock 17, but that was a very hot load and would not recommend going that high, it was definitely the upper bounds with a seating depth of 1.048″.

[lou altomar]

The 124 gr JHP MPR has become my go to bullet for all my 9mm loads. I use Hodgdon CFE Pistol exclusively and found that 4.9 gr works best, for me. COL is determined by the plunk and spin test for all 4 barrels and final length is determined by subtracting .010 from where the bullet contacts the lands. . I have 3 CZz and one Staccato. COL ranges from 1.046 to 1.115. 1.046 COL for the Shadow2, 1.077 for the PCR and TSO, and 1.115 for the Staccato. I’m not so sure I’m gaining any accuracy by customizing the COL. I didn’t bother using a chronograph because all loads were well below the max recommended by Hodgdon.

[STEVEN JENSEN]

4.2 gr Red Dot. 1.12 inch COL. WSP primer in S&B cases. This combo gave average muzzle velocity of 1044 fps, 11.28 SD, 36 fps extreme spread out of a 3.1 inch barreled S&W Shield. Functions perfectly and accuracy is similar to any other defensive type load. Would like to see some expansion tests for this bullet.

[STEVEN JENSEN]

Should have added that th S&W has the shortest chamber of my 9 mms. It has become my only “plunk” barrel. If it works in that pistol, it also works in the Ruger and Sig.

[Grouse Chaser]

Below is a medium-heavy load with the MPR JHP 124gr in 9×19; (I’ve also run a few trials with RMR’s TCFP 124 Matchwinners which I’ll post to that thread).

If helpful:
–I ran these @1.109″ (knowingly long for this bullet’s profile). I have some ready-to-test @ 1.0875″ / down-loaded to 5.0 gr BE-86.
–Just my experience, but with PISTOL loads I find more accuracy contribution from low SDs (which is often easier to achieve with moderately shorter COLs) than I do with fretting about the jump gap to rifling.
–Below shot at 7 yards rested on a towel. Not really a meaningful distance to measure accuracy…but all 10 shots were just about covered with a half-dollar.

Description: RMR MPR JHP 124gr
Notes 1: Alliant BE-86 5.3gr / COL 1.109″ / WSP/ Herters (These were Cabela’s S&B produced era brass) once fired cases
Notes 2: Beretta 92 (stock – early 90’s production)
Distance to Chrono (FT): 10.00
Bullet Weight (gr): 124.000
Temp: 57F
Shots
# FPS FT-LBS PF
10 1104 335.64 136.90
9 1109 338.69 137.52
8 1103 335.03 136.77
7 1084 323.59 134.42
6 1070 315.29 132.68
5 1075 318.24 133.30
4 1083 322.99 134.29
3 1105 336.25 137.02
2 1091 327.78 135.28
1 1087 325.38 134.79

Average: 1091.10
StdDev: 13.58
Min: 1070
Max: 1109
Spread: 39
True MV: 1092.34

• This reply was modified 3 years, 4 months ago by Grouse Chaser. Reason: added relevant info

[jamindude270]

1.08 for both 115 RMR and 124 RMR…in 3 custom Glock 19 , Sig 2022, G-17, 2 Hellcats

[Cliff]

124 grn mpr or xtp
4.1 grn titegroup
CCI 500 or 550
1.06 COAL
~1100 fps from 4″ bbl
~1125 fps from 5.5″ bbl

[Author]

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