9mm 124 MPR

[Cliff]

Hot load
124 mpr or xtp
6.6 grn HS-6
CCI 500 or 550
1.06 COAL
~1235 fps from 4″ bbl
~ 1275 fps from 5″ bbl

7000 feet asl

[Larry Tavares]

I’ve settled on 4.4 grns of Bullseye
My 10 shot string produced
1074 min FPS
1126 max FPS
Average 1101
ES 52
SD 15.6
COL 1.94
Glock 19

[Larry Tavares]

Col 1.094

[Fred]

I had the same issue with my S&W 469, the 124MPR at the ogive was just too wide not to hit the lands. The slide would not go into battery. My solution was to use a powder that sat the bullet deeper into the case. I found that Hodgon HS-6 at 6.8 grains sat the bullet for a 1.090″ OAL (published data). I posted a YouTube video on the gun and reloading for it, start at 14.26 where I talk about the 124MPR reloading:

• This reply was modified 4 years, 10 months ago by Fred.

[Smiley]

124 gr MPR
5.8 gr True Blue
1.060
1138 Fps 20 shot average
1125Fps min
1155Fps max

HK VP9

Loaded on Hornady LNL with Hornady dies

[Kyle Kennedy]

5.4 AutoComp @1.095″ gives me 1060fps from my G26G4
Also went for a +p load- above Hodgdon’s max charge
5.6 = 1108 had a similar ejection pattern as Rem Golden Saber 124 +p @1140
5.8 = 1140 but threw the brass a little higher
I’m sticking with 5.4

[TallPaul]

4.4gr of Winchester 231 works well in each of my 9mm’s. Used W231 exclusively during IPSC competition, burns fairly clean and stable for consistency in loads.

[henryseale]

I have three loads for the 124 gr. RMR JHP 9MM:
Weapon used was a M-92 Beretta
4.4 gr. Titegroup c.o.l. 1.09″ av FPS 1098

5.3 gr. CFE Pistol ” av FPS 1087

6.5 gr. Vihtavuori 3N37 ” av FPS 1150

[Jerry Gossette]

I’ll add mine to support…
1.063 MAX with the multi’s because of my Taurus G2C… wife’s Taurus PT-111 and my S&W 5906 don’t care. Both can go all way to 1.125 with 147 Everglades JHP… (switched to RMR after that) and ran into their fat ogive.. Still have 410 124 multis left and 1500 124 RMR-RN just arrived. I now have a Stribog A3 to feed so will see what length I can stretch out the COAL of any future rounds out to… oh, and 4.2 to 4.4 of Win 244, depending upon which cases I’m loading. (Yes, I’ve done case volumes on all the different 9mm and keep a a go to log of their averages…)

[twoodruff78]

Cartridge: 9mm Luger
Bullet: RMR 124gr MPR
Primer: CCI-500
Case: Mixed
Powder: Winchester 231
COAL: 1.091″
Springfield Hellcat Chrono Data (3″ barrel):
Ambient Temp. 78F
Charge Wt. – Measured Velocity
4.5 – 1068 fps
4.8 – 1111 fps
5.0 – 1131 fps
5.2 – 1155 fps
5.4 – 1188 fps

Caution: These loads are hot in my gun. I have settled on the 5.0 gr. load for my personal use. I have not seen any pressure warning signs in my gun, but for reference, my +P Federal 124gr factory ammo measured 1030fps out of my CM9 (different gun, looser chamber, same barrel length).

• This reply was modified 4 years, 10 months ago by twoodruff78.

[tim]

9 Major Open Gun

124MPR
7.3 grains CFE Pistol
1.165 OAL
CCI SPP
1375-1400fps – 170-173PF given temp, humidity, elevation
Atlas Gunworks Chaos 9 major open gun, 2 popple holes, 3 port comp.

WARNING! this is an over pressure round and should only be used in a gun that is specially built to fully support the round and pressures!

[STEVEN JENSEN]

Unsub

[jdh]

RMR MPR 124gr 9mm
Glock 17 Gen4
CCI-500
OAL=1.070” (I have since switched to 1.050” for expanded compatibility with other guns)

CFE-Pistol
5-shot groups
Grains of Powder, Ave FPS, SD
4.2, 946, 15.5
4.4, 1003, 30.4
4.6, 1016, 13.7
4.8, 1053, 26.0
5.1, 1124, 16.1
5.3, 1154, 8.1
5.5, 1179, 17.6

I have loaded and shot many thousands of rounds using this formula and 5.1gr of CFE-Pistol in Glock 17 Gen4, Glock 19 Gen3, and Sig P365xl.

Winchester 231
10-shot groups
Grains of Powder, Ave FPS, SD
4.7, 1159, 8.3
4.8, 1187, 14.1
4.9, 1194, 7.9

[Nathan Dively]

Vitahvuri 3n37
Rocky Mountain Reloading
124gr Multi Purpose Round/ Jacketed Hollow Point
1.09 OAL
.378 crimp
mixed brass & mixed primers

3n37 min 6.1 max 6.4
5.2 gr CZ-P10F
978 1013
1000 1026 Average 1016.3
1034 1057 Standard Dev 21.09265275
1019 1005 Power Factor 126.0212
1010 1021
Used factory recoil spring. Probably better feel with 15lb spring.

5.5 gr
1042 1064
1050 1034 Average 1059.4
1057 1066 Standard Dev 14.5311925
1066 1069 Power Factor 131.3656
1085 1061
Extremely accurate
factory recoil spring great return to zero
15lb recoil spring solid return to zero

5.8 gr
1085 1187
1109 1140 Average 1129.5
1110 1122 Standard Dev 36.14553914
1103 1106 Power Factor 140.058
1194 1139
Great groupings.
Bouncing on return with factory recoil spring
Harsh recoil with 15lb recoil spring but great return to zero

6.1 gr
1156 1191
1170 1149 Average 1166.1
1175 1161 Standard Dev 12.19699417
1159 1174 Power Factor 144.5964
1169 1157
Supremely accurate
Harsh recoil
returns to zero well with factory recoil spring.
Do not use lighter recoil spring

[vkhrealboy]

I have seated the 124HP RMR Bullet at 1.060 and never had a malfuntion. So far at that seating depth, the bullets functioned flawlessly through Canik Mete, Canik TP9SF, Springfield Hellcat, Sig P365, Sig M17, S&W SD9VE, and Taurus GX4.

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