RMR 124 gr JHP

[nettlle]

I received my first of these in the mail today and am going to load a few up to try. I was wondering if anyone loads these for a CZ PCR and if so what COAL works. Right now I am considering a COAL of 1.060".

 

[Walkalong]

2nd from the right loaded at 1.070 to 1.075 OAL. Some folks load it shorter.

 

[LiveLife]

For this reason, I started a reference thread for max OAL for different barrels and bullets - https://www.thehighroad.org/index.p...let-max-working-oal-col-for-reference.848462/

I will keep updating the thread with help from other THR members.

As Walkalong posted, depending on the leade length of barrel, RMR 124 gr JHP MPR with shorter rounder nose needs to be loaded shorter to clear the start of rifling.

Here's a listing of barrels from longer leade to shorter leade and max OAL (also working OAL) for your reference:

KKM 9mm 124 gr MPR - 1.115"
Shield 9mm 124 gr MPR - 1.105"
Tactical Kinetics 9mm 124 gr MPR - 1.055"
Lone Wolf 9mm 124 gr MPR - 1.040"

 

[nettlle]

For this reason, I started a reference thread for max OAL for different barrels and bullets - https://www.thehighroad.org/index.p...let-max-working-oal-col-for-reference.848462/

I will keep updating the thread with help from other THR members.

As Walkalong posted, depending on the leade length of barrel, RMR 124 gr JHP MPR with shorter rounder nose needs to be loaded shorter to clear the start of rifling.

Here's a listing of barrels from longer leade to shorter leade and max OAL (also working OAL) for your reference:

KKM 9mm 124 gr MPR - 1.115"
Shield 9mm 124 gr MPR - 1.105"
Tactical Kinetics 9mm 124 gr MPR - 1.055"
Lone Wolf 9mm 124 gr MPR - 1.040"

I have been following your thread on maximum OAL. I loaded (100) of these to 1.090" COAL. Plunked all (100) with mixed range brass. Poured rain all day today but hope to try these (100) out tomorrow for reliable cycling and accuracy. All and all I am very pleased finding these bullets at such a reasonable price. It was a joy to load them this afternoon.

 

[Dudedog]

RMR MPR is my favorite 9mm bullet for practice/matches, good bullets!

 

[rfwobbly]

I received my first of these in the mail today and am going to load a few up to try. I was wondering if anyone loads these for a CZ PCR and if so what COAL works. Right now I am considering a COAL of 1.060".

That is the Maximum OAL for these bullets as reported by most users on the Original CZ Forum. The RMR bullet has a rather blunt ogive, and together with the short CZ leade, results in the shorter OAL. No members have reported feed issues at this length.

 

[nettlle]

That is the Maximum OAL for these bullets as reported by most users on the Original CZ Forum. The RMR bullet has a rather blunt ogive, and together with the short CZ leade, results in the shorter OAL. No members have reported feed issues at this length.

It worked out that 1.090" COAL is about a .015" set back from touching the lands and these hand cycle OK. I'll have a chance to shoot them tomorrow.

 

[Dudedog]

1.08 works fine in all my 9mms but none of them seem to be really short chambered.
I did a quick test at 1.065 and 1.08
S+B SP. mixed range brass, charges as thrown after setting measure, 5" 9mm 1911
String: 1
Date: 9/17/2017
Time: 11:52:56 AM
Grains: 124
Hi Vel: 1068
Low Vel: 1040
Ave Vel: 1055
Ext Spread: 28
Std Dev: 10
RMR MPR JHP 4.4 WSF 1.065
Velocity Power Factor Ft/Lbs
1058 131.192 308.173
1050 130.2 303.53
1059 131.316 308.756
1040 128.96 297.776
1068 132.432 314.026

String: 5
Date: 9/17/2017
Time: 11:24:26 AM
Grains: 124
Hi Vel: 1037
Low Vel: 1012
Ave Vel: 1021
Ext Spread: 25
Std Dev: 9
RMR MPR JHP 4.5 WSF 1.08
Velocity Power Factor Ft/Lbs
1021 126.604 286.995
1018 126.232 285.311
1012 125.488 281.958
1020 126.48 286.433
1037 128.588 296.061

The ones at 1.065 say 4.4gr in my notes but as I recall they were more like 4.45 ish some scaled at 4.4 some at 4.5
So going from 1.08 to 1.065 picked up about 30 fps in my gun.

If it matters, 4.5gr makes 125 PF but no wiggle room!

 

[nettlle]

Finally had a chance to shoot the RMR's today. Went through 100 rounds and they ran 100%. Accuracy was excellent.

I like them!

 

[LiveLife]

Nice to hear.

 

[Dudedog]

I like them!

 

[troy fairweather]

has any one seen a gel test or water expansion of the 124 rmr hp. i am looking to get a 9mm carbine and would like to use it for my do every thing bullet. maybe shoot some coyotes and some small game, maybe pop a doe.

 

[LiveLife]

I believe the RMR MPR bullets were designed to expand and members have reported good expansion.

Here's another thread on RMR MPR that should provide some more data - https://www.thehighroad.org/index.php?threads/rmr-new-124gr-hp-9mm.824405/