Anyone using RMR 124gr 9mm MPR and CFE ? load advice needed

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I run my FMJ rounds at 1.125" and these bullets are shorter so I figure a shorter COL would be appropriate. I made up some test rounds today, 15 each at 4.8, 5.0, and 5.2 of CFE and used a COL of 1.065". They all pluck and cycle by hand, so I don't anticipate any feed problems. Looking at the weather forecast it seems like Thursday is the only day that will not have snow or be real cold and windy so I'm planning on running them through the chronograph then.
I checked my load data. 5.4gr of CFE at 1.06 OAL, ~1266 fps. Lowered it to 4.9gr of CFE, same OAL, ~1166 fps.
I have a match barrel that has really tight specs, so I have to load short for it with every bullet I've tried.
 
Load mine to 1.060 due to short lead on my springfield xds and cz shadow 2.

Don't have cfe so can only offer oal.

Great bullets!

Same here - I load mine to 1.060 as well for my CZ85 barrel. 5.3gr of CFE Pistol is my current load. It's a bit hotter than I'd like ideally, but the group tightened up significantly at 5.3gr over 5.1gr for me. I may back off a little and see how I like that too. My Sig P365 and Ruger PC9 both like this load as well.

I think I may prefer the 115gr MPR's over these 124's, but the 124's have been available lately and the 115's aren't so I've been shooting 124 and saving my 115's
 
I checked my load data. 5.4gr of CFE at 1.06 OAL, ~1266 fps. Lowered it to 4.9gr of CFE, same OAL, ~1166 fps.

Thanks for the info. Sounds like my test rounds should be in the ballpark. It's 19* outside right now but supposed to go to 41* this afternoon so I'll wait a bit then head out to the range with my chrono.
 
Load mine to 1.060 due to short lead on my springfield xds and cz shadow 2.

Don't have cfe so can only offer oal.

Great bullets!
Same OAL for my XDm. My SP-01 was my test barrel, previously. If it clears that, it will clear anything I own, except for the XDm.
 
I made up some test rounds so I could find out what load would hit the target velocity. I made up 15 rounds each with 4.8, 5.0, and 5.2 grains of CFE pistol under the 124 grain bullets. I used Federal match magnum primers since that's what I have the most of. I wasn't sure what COL to use as I normally go 1.125 with FMJ's and these were considerable shorter bullets. I determined that they would plunk nicely at 1.065 so that's what I used.



Yesterday was the first one lately when the weather wasn't totally **** so I headed out to the range to run them through the chrono. Cliff notes version of the results were:



4.8 gr averaged 1047 fps, which is too slow, and I expected that. I was simply going by the start low and work up method. Strangely enough the very first round didn't cycle but the next 14 did.



5.0 gr averaged 1084 fps and cycled every round, but still not at the target velocity.



5.2 gr averaged 1134 fps so that seems to be well into the sweet spot while still below the maximum charge listed which is 5.3 on most of the tables I saw.



I know that changing bullets (from my usual 115 gr FMJ to the 124 gr MPR) can affect point of aim to point of impact so I'll need to do some testing on that but I don't think it's going to be a factor. I'm only shooting from about 5 yds away from the target when working with the chronograph but all 45 rounds I fired were in a pretty tight group of about 1 1/2". I'm planning on firing a couple mags of each bullet at separate targets and comparing the points of impact at 10 yds, then at 25 yds. That should tell me if there's any significant difference.



I guess most guys are shooting indoors right now as I didn't see any other footprints in the snow.





50909193626_c279fff2a5_b.jpg



It was actually a decent day to shoot outdoors with the temp in the low 30's, bright sunshine and very little wind.
 
Can you post a picture of the MPR that you got? We have two machines making them and depending on which one it came off of, you may be right at the expansion threshold. My experience with CFE is that it is a fine powder at max charges, but doesn't really shine at anything under max.
 
I find that as well. Cfe doesnt really group too well towards the lower end of a given charge range. On a 1-10 scale 10 being max charge you usually need to run around an 8 of 10 to tighten up your groups.. hs6 is similar.. 3 days of ice cold rain still havent gotten to shoot, my ranges out back are like swamps ☹
 
Can you post a picture of the MPR that you got? We have two machines making them and depending on which one it came off of, you may be right at the expansion threshold. My experience with CFE is that it is a fine powder at max charges, but doesn't really shine at anything under max.

This is what I got:


50914704211_bf0646464b_b.jpg


Is 1134 fps not fast enough? I'm getting close to the max listed charge with CFE and don't really want to go above that. The only other pistol powder I have on hand is Titegroup and I don't think that would be better. Thoughts?

Part of the problem is that I don't know what data to look at for this round so I've been using the Speer GDHP data although they list a significantly longer COL at 1.120 while I'm using 1.065.
 
I'll check later this afternoon/evening when I'm home. But if I recall correctly, 1.060" is Hornady's 124 gr. XTP OAL. And I believe the XTP bullet itself is longer than the MPR bullet.
 
Okay, I found some info on my phone. XTPs OAL is .578" and the MPR JHP bullet is .557" OAL. From a comparator's measurements, XTP bearing surface length is .293" and the MPRs is .285".
I don't have Hornady's data with me, but you should be in the safe zone with their data.
 
I find that to be the case with most RMR 9mm bullets (slightly shorter than their Hornady counterparts). I greatly appreciate that as it allows me to use Hornady data with peace of mind, even though I usually need to load with a slightly shorter OAL than Hornady calls for in order to plunk in my CZ barrel. Often the RMR bullet is shorter by more than the OAL reduction I'm using.
 
I looked in the Hornady manual, 124 gr. XTP with CFE-P max is 5.3 gr., OAL 1.060" for a velocity of 1150 fps.
 
Let me clarify the question I have. I posted these results from my testing:

5.2 gr averaged 1134 fps so that seems to be well into the sweet spot while still below the maximum charge listed which is 5.3 on most of the tables I saw.

And got this response:

We have two machines making them and depending on which one it came off of, you may be right at the expansion threshold.

I was under the perhaps mistaken impression that anything over 1100 fps was good to insure expansion with these bullets. Are you saying that the 1134 fps average I saw may not be enough?



I looked in the Hornady manual, 124 gr. XTP with CFE-P max is 5.3 gr., OAL 1.060" for a velocity of 1150 fps.

That seems to be very much inline with my test results.
 
I got the chance to compare point of aim vs point of impact between 115 gr FMJ and 124 gr MPR earlier this week. I shot both at 10 yds then at 25 yds.I could not find any discernible difference in my EDC which is a 4" M&P compact. Therefore I believe that any practice I do with the ball ammo will apply equally to the MPR as carry ammo.

There is slightly more recoil with the 9mm MPR's as they are a heavier bullet and I'm loading them hotter to hit the 1100fps mark, but it's not bad at all. Certainly not when compared to shooting my .45 with 230 gr FMJ's.
 
We have two machines making them and depending on which one it came off of, you may be right at the expansion threshold.

@longdayjake

Would you please post a picture of the old vs new machine bullets when you have a chance.
 
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