couple RMR bullet questions?

[Dudedog]

I am loading them at 1.08 and started at 4.4, guessing it will take about 4.6 to make 125 PF.
I am searching for loads that work well and make a bit above 125 PF so about 1030-1050 fps.
At 1.08 I think the FMJ data will be closer but maybe a wee bit high. (at least with CFE-P)
Will post when I have a chance to get some chrono results.

All I need to do now is figure out how to get the farmers to pay me for taking a day off and making it rain. (doesn't rain here that much)
Then I can order some more bullets from RMR.

 

[Doublehelix]

The more consistent the results.

Oops, yes, of course. Thanks for catching that, although I would hope that "consistent charge" and "consistent results" are somewhat related in this case.

 

[Chillydog]

I bought some of the RMR FP FMJ to use for 357 sig and 9mm. For the 9, I have a S&W shield that I want to work up a load for. I have not loaded for it yet, but have read it has a pretty short lead. I'm guessing I will need to have an OAL between 1.08 and 1.06 with the FP.

For powder, I was thinking to start with WSF at 3.8 or 3.9 and work up. I have a chrono so I can watch the numbers as I progress. I would like to use this in a practical pistol match but I'm new to that and don't know the rules yet. I'm guessing I need to make the 125 PF. Can I get there with a 3" barrel and Wsf?

I would like to use my carry gun for the practical pistol. Maybe not the best choice but gives me time using it.

 

[Walkalong]

I would hope that "consistent charge" and "consistent results" are somewhat related in this case.

Not always. Sometimes things don't work, even when very consistent. But yea, we hope for get consistent results when we feel like we have done everything right.

 

[Walkalong]

Can I get there with a 3" barrel and Wsf?

Should be able to. WSF is good stuff in 9MM.

 

[Dudedog]

125 FMJ Winchester WSF 0.355 1.16 4.7 1015 27,700 PSI 5.3 1115 32,700 PSI
Long OAL but start is 4.7
No problem starting at 3.8 but you might not have function, should be more than enough for the bullet to clear the barrel.
I don't think you need to go that low to start. If it was me I would start at 4.3-4.4 with the FNs at 1.08 OAL
Just guessing but probably around 4.6gr WSF to make 125 PF with a 3" barrel.

For me I prefer not having an exposed lead base so I have lots of the MPR JHPs on hand, looking at that to be my go to bullet for matches and practice as well.
(Feels wrong shooting nice HPs for practice but the price on them is right, getting ready to order a couple 1000 more)

These are with the MPR JHP wth 4.0gr WSF at different OALs
Note that even short at a 1.04 OAL 4gr is just making about 1000fps.
With this mild load the difference between 1.04 and 1.08 was about 40fps.
Bear in mind things would probably be a lot different you you were closer to a MAX charge
You have plenty of room to work with going up so getting a load to make 125 PF, so even with a 3" barrel it should be easy and leave you plenty of wiggle room..

Mized Range Brass, S+B SP, 4.0gr WSF
5" 9mm 1911
Temp 107 ish
OAL 1.08
981 121.64 265.04
966 119.78 257.00
977 121.15 262.89
955 118.42 251.18
948 117.55 247.51
Avg 965.40
Lo 948.00
Hi 981.00
ES 33.00
SD 14.05
OAL 1.065
975 120.90 261.81
989 122.64 269.38
960 119.04 253.82
988 122.51 268.84
976 121.02 262.35
Avg 977.60
Lo 960.00
Hi 989.00
ES 29.00
SD 11.80
OAL 1.055
992 123.01 271.02
983 121.89 266.12
987 122.39 268.29
977 121.15 262.89
1010 125.24 280.94
Avg 989.80
Lo 977.00
Hi 1010.00
ES 33.00
SD 12.56
OAL 1.04
989 122.64 269.38
1003 124.37 277.06
1012 125.49 282.06
995 123.38 272.66
1007 124.87 279.28
Avg 1001.20
Lo 989.00
Hi 1012.00
ES 23.00
SD 9.23

 

[Chillydog]

Dudedog,

Wow!

Thanks for the info. I will take your advice and up the starting charges some. No point in going too low.

It will be a couple weeks before I can try anything out. I’ll update with results later.

Thank you!

 

[Dudedog]

I loaded up some of the FNs at varying charges with an OAL of 1.08. Will try to test some out of my 3" XD subcompact to give you a better Idea of what it will take.

 

[Shooting.Dawg]

So, I am new to this forum and recently purchased some RMR bullets for trial. Below are my Chrono results for the 124gr RN(plated) and the 124gr JHP MPR. I did not think to take a picture of the impact to target for accuracy purposes. I was shooting through my chrono @ 10 ft ... at a target at 20 yds. NOT BENCHED ... Free style. If I recall correctly, grouping wasall within a 'soup can' lid.

Pistol: SIG P320 X5, 5" Barrell, 13# recoil spring
--------------------------------------------
RMR 124gr JHP MPR
OAL: 1.085"
Brass: WIN
Primer: CCI # 500
Powder: Shooter's World "Clean Shot" @ 4.0gr
12 rounds shot

PF Low: 132
PF High: 134
PF Avg: 133
Min Vel: 1062
Max Vel: 1078
Avg Vel: 1069
Spread: 16
SD: 4
--------------------------------------------
RMR 124gr RN (plated)
OAL: 1.115"
Brass: WIN
Primer: CCI # 500
Powder: Shooter's World "Clean Shot" @ 4.0gr
16 rounds shot

PF Low: 128
PF High: 133
PF Avg: 131
Min Vel: 1032
Max Vel: 1069
Avg Vel: 1056
Spread: 32
SD: 9
--------------------------------------------
RMR 124gr JHP MPR
OAL: 1.085"
Brass: WIN
Primer: CCI # 500
Powder: VV N320
12 rounds shot

PF Low: 123
PF High: 134
PF Avg: 129
Min Vel: 990
Max Vel: 1041
Avg Vel: 127
Spread: 51
SD: 13

 

[Dudedog]

Welcome to THR Shooting.Dawg.
Lots of great people here.

Thanks for the chrono #s.

RMR offers THR members a 5% discount with the code TheHighRoad5 and THR your screen name

RMR is a pleasure to do business with.
I really like their new MPR, cheap enough to do double duty, practice/match/zombie loads.

 

[Dudedog]

Forgot to post HP38 results

Getting old, senile and blind......
S+B SP, mixed range brass, all charges as thrown after setting measure
5" 9mm 1911

String: 9
Date: 10/29/2017
Time: 9:35:27 AM
Grains: 124
Hi Vel: 959
Low Vel: 927
Ave Vel: 944
Ext Spread: 32
Std Dev: 11.35
RMR 124 MPR JHP 3.9 HP38 1.055 5inch 1911
Velocity Power Factor Ft/Lbs
959 118.916 253.198
945 117.18 245.859
927 114.948 236.583
945 117.18 245.859
944 117.056 245.339

String: 5
Date: 10/29/2017
Time: 10:07:31 AM
Grains: 124
Hi Vel: 1003
Low Vel: 962
Ave Vel: 983.2
Ext Spread: 41
Std Dev: 15.5
RMR 124 MPR JHP 4.0 HP38 1.06 5inch 1911 (hair longer OAl on these)
Velocity Power Factor Ft/Lbs
986 122.264 267.656
975 120.9 261.717
990 122.76 269.832
1003 124.372 276.965
962 119.288 254.785

String: 1
Date: 10/29/2017
Time: 9:37:06 AM
Grains: 124
Hi Vel: 1012
Low Vel: 981
Ave Vel: 998
Ext Spread: 31
Std Dev: 11
RMR 124 MPR JHP 4.1 HP38 1.055 5inch 1911
Velocity Power Factor Ft/Lbs
1002 124.248 276.413
995 123.38 272.565
981 121.644 264.948
1012 125.488 281.958
1004 124.496 277.518

String: 2
Date: 10/29/2017
Time: 9:42:14 AM
Grains: 124
Hi Vel: 1068
Low Vel: 1004
Ave Vel: 1034
Ext Spread: 64
Std Dev: 24 (yuck, thinking the 1004 may have been a bit light charge wise)
RMR 124 MPR JHP 4.3 HP38 1.055 5inch 1911
Velocity Power Factor Ft/Lbs
1046 129.704 301.222
1021 126.604 286.995
1004 124.496 277.518
1068 132.432 314.026
1034 128.216 294.35

Throw out the 1004 and the #s are a lttle better
AVG 1042, ES 44, SD 20