RMR 9mm 124gr rn plated oal

[JO JO]

RMR 9mm 124gr rn plated oal ?
what oal is working for you guys ?
this is my first time using rmr bulets I normally use xtreme but wanted to give rmr a try I load my xtreme 9mm 124 gr rn at
1.135 oal anything different I should know useing rmr 124gr plated rn
thanks

 

[Louca]

I load that bullet and my OAL is about 1.110 inches.

 

[egd]

I load the 124 rmr fmj rn at 1.135. Works great in both pistol and pcc.

 

[1KPerDay]

other people's OAL won't tell you what will work in your guns. You have to plunk and do feeding tests in your guns. This goes for all bullets.

 

[JO JO]

other people's OAL won't tell you what will work in your guns. You have to plunk and do feeding tests in your guns. This goes for all bullets.

I know this , I am just curious as I have not loaded rmr rn before and they have a bit of different shape and length then the xtreme that I normally use , I know they are a popular bullet here and lots of folks use them
just curious
thanks guys

 

[Charlie98]

they have a bit of different shape and length

Like... how much longer?

 

[Dudedog]

Plated or the new FMJ RNs?
I used to seat the plated ones to about 1.11. just a bit deeper than some other RNs.

 

[Walkalong]

I have not used that particular bullet, but I generally load 115 & 124 Gr RN to fall between 1.130 & 1.135 in 9MM. An unusually blunt RN may need to be shorter.

 

[Skgreen]

I used to try and find pistol OAL's online. Just seemed like it would be the fastest / easiest thing to do.

After a while, (and who knows how many HOURS spent searching online) I realized there's just too many different guns/projectiles/~opinion's~ involved to really know what I need,,,

Like many, I have quick access to a couple semi-auto's in various calibers................

Now, it's just faster/easier (and a whole lot more reliable) to grab one, pull it down, (30 - 60 seconds on a bad day) and 'plunk'.

 

[MarshallDodge]

On FMJ stuff, I just take a factory loaded round and use it to set the crimp and OAL. 25 years of reloading and multiple manufacturers of bullets and this has worked for me but your mileage may vary. The plunk test is always a good idea

Hollowpoints and flat nosed are a little more tricky but a factory loaded FMJ will get you close.

 

[340PD]

I interchange between 124 gr. RME, Extreme, and Delta Precision and I have never changes my dies. Maybe I am lucky but i have never had any feeding or function issues with my 9mm's in any of my many guns and I have tried a lot of different OAL's

 

[LiveLife]

RMR 9mm 124gr rn plated oal? what oal is working for you guys?

I generally load 115 & 124 Gr RN to fall between 1.130 & 1.135 in 9MM.

other people's OAL won't tell you what will work in your guns. You have to plunk and do feeding tests in your guns. This goes for all bullets.

+1. As to determining working OAL for any new bullet, I first determine the max OAL using the barrel then feed/chamber from the magazine to determine the working OAL (I incrementally decrease OAL by .005" until dummy rounds feed/chamber reliably). Then I conduct powder workup. Once I identify the most accurate powder charge, then I incrementally decrease the OAL by .005" to see if accuracy improves. If accuracy improves, I will use shorter OAL. If not, I will use longer OAL. (Continue reading to find out why)

I usually load 115/124 gr FMJ/RN around 1.130"-1.135" as shorter OAL produced smaller groups than 1.150"-1.160" for most of my barrels with various powders, particularly when using lower charges for lighter minor power factor target loads (This is often due to more denser powders like W231/HP-38/Sport Pistol creating powder forward situation when round is chambered and powder charge is slammed forward; and with longer OAL, there's more air gap between primer flash hole and powder granules. I have found bullet/OAL/powder charge combinations where primer flash hole is covered by powder charge when round is chambered, produce greater accuracy than loads that do not).

Exception to this is when using certain powders/charges that could produce compressed charges like WST and Herco where I used 1.150" - 1.160" OAL for various 115/124 gr FMJ/RN bullets - https://www.thehighroad.org/index.php?threads/9mm-and-herco-for-jacketed-lead-plated-bullets.745656/

To determine max case fill to prevent powder compression, especially with fluffy powders (particularly when using near max/max charges):

• Subtract bullet length from working OAL
• Subtract this number from average resized case length
• Then using the end of calipers, come down from case mouth and mark inside the case
• Fill powder to mark and weigh on scale
• If max case fill is more than published max charge, you won't compress powder charge

FYI, Atlanta Arms who produces match ammunition for various match teams use the following OALs:

1.130" OAL - 115 gr FMJ Match AMU (This ammunition is designed for extreme accuracy at 50 yards and is used by the Army Marksmanship Unit and the Marine Service Pistol team for service pistol matches. Accuracy test requirement: 5 ten-shot groups at 50 yards with an average group size not to exceed 1.5 inches. Fired from a Match Grade barrel fixture. 1150 FPS Minor Power Factor 125) - https://atlantaarms.com/products/9mm-115gr-fmj-match-amu.html

1.135" OAL - 124 gr FMJ (This ammunition averages 1060 FPS and is test fired through a Glock 17 at 131 power factor) - https://atlantaarms.com/products/9mm-124gr-fmj-select.html


BTW, these are the minimum OAL I use for RMR in-house 124 gr 9mm bullets

 

[Strat Rider]

After that cornucopia of information from bds, I almost hate to speak . . . but . . .
I have several 9mm's and having done similar and exhaustive research too - I finally found it best to just load all ammo to fit the one with the shortest chamber.
Even though I shoot competition, our longest shots are usually around 40 yards and those are quite few and very far between - so "accuracy" is usually more determined by how much adrenaline is running at the time.
For defense - a) you should be carrying defensive factory ammo to start with and
b) if you shoot at someone that far away - you will likely have a lot to answer for if you hit them.

 

[JO JO]

I am switching powders and projectiles and working on a new target load , I have loaded up some samples and plan on a range trip next week with a few different 9mm guns to compare results,
Once I find the one load I like then I will load up a bunch, I normally loaded for 40sw and had my favorite load but have now consolidated to 9mm and testing loads for a go to paper puncher

 

[someguy2800]

I load them to 1.130 and they work in everything. They are some of the most accurate bullets I’ve ever tested. I load them with 5.0-5.3 grains of power pistol.

 

[cougar1717]

I shoot the RMR 124gr plated RN in a 4" barreled handgun with a longer throat. Using True Blue (or other performance powder - ie slower handgun powder), I use an OAL of 1.150". Absolutely plunk it, test for cycling function, and for magazine function in your firearm before loading significant quantities. I do not load this for competition, just fun. Plinking at 100yds is absolutely viable, with the bottleneck being my sight alignment. This combination of handgun and ammo is so good, it has kept me from purchasing a PCC.

That said, I agree with the others if you have multiple 9mm's (or don't want to keep separate ammo per firearm) to just set the OAL to fit the shortest chamber and not worry about which ammo goes to which firearm.

 

[1KPerDay]

After that cornucopia of information from bds, I almost hate to speak . . . but . . .
I have several 9mm's and having done similar and exhaustive research too - I finally found it best to just load all ammo to fit the one with the shortest chamber.

Same here... that way I know they'll at least work in all of them.

 

[CrankyCraig]

1.135

 

[George P]

I know this , I am just curious as I have not loaded rmr rn before and they have a bit of different shape and length then the xtreme that I normally use , I know they are a popular bullet here and lots of folks use them
just curious
thanks guys

I set my seating die to achieve a certain OAL, regardless of the bullet; since I only reload 124 gr, the differences are minor and they all feed perfectly.