RMR 115gr .355 plated load data

ParallelCode · May 16, 2021

I was recently gifted some RMR 115gr copper plated bullets I intend to load for 9mm with Power Pistol. They had been purchased several years prior and no longer appear on the RMR site, at least not as of this afternoon.

I read a THR thread from back in '09 that, in the absence of specific plated data, recommended using the high-half of cast data or the lower half of jacketed data for comparably shaped bullets.

I'm assuming that approach is still valid, but I was wondering if there were any load-data insights specific to RMR's 115gr plated bullets that someone could share.

Hartkopf · May 16, 2021

https://reloadingdata.speer.com/downloads/speer/reloading-pdfs/handgun/9mm_Luger__115_rev1.pdf

I use Speer data for my RMR cprn.

9mmepiphany · May 16, 2021

ParallelCode said:
They had been purchased several years prior and no longer appear on the RMR site, at least not as of this afternoon.

You aren't likely to see them on the site again. The 115gr RN plated bullet was the first one replaced by a FMJ bullet when they started manufacturing bullets in-house.

AJC1 · May 16, 2021

3.9-4.0 grains of TG and any mixed brass and you have blamo.

lordpaxman · May 17, 2021

The approach for the higher half of cast to lower half of jacketed is valid and what I use, for a similar type and weight of bullet. As always, better to use published data. I didn’t have PP at the time I had some RMR plated, so I used WSF and was quite happy with it. I’m pretty sure it was 5 or 5.1gr at 1.150”. Good luck.

Walkalong · May 17, 2021

Most plated bullets can use 80/85% and sometimes more of jacketed data. Some makers said to use any jacketed data, if you look at published data with plated bullets sometimes it's as much as their jacketed counterpart and sometimes a little less.

Here is what X-Treme says currently:

Load Info
Our Copper Plated Bullets can be run at mid-range jacketed velocities or higher end lead velocities. We recommend keeping velocities to less than 1500 FPS (Feet Per Second) and using only a light taper crimp

Any velocities over 1200 FPS we recommend either our Heavy Plate Concave Base or Hollow Point products for superior accuracy. We recommend keeping velocities to less than 1500 FPS (Feet Per Second) and using only a light taper crimp

Here is what Berrys currently says:

Where can I find load data for your bullets?
Load data from any load manual or website can be used. Full-metal jacketed, lead bullet, or plated bullet load data can be used as long as the following standards are adhered to:

The data contains the correct grain weight of bullet.

Berry's max recommended velocity is not exceeded. (This info is displayed on bullet boxes and product webpages.)

Standard Plate Bullets Max Velocity: 1,250 fps.

Thick-Plate Bullets (TP) Max Velocity: 1,500 fps.

Do not over-crimp the bullet. Crimping so tight that bullet deformation occurs, or plating is separated causing visible exposure of the lead core will cause tumbling, key-holing, and reduced accuracy.

Ranier used to say use jacketed data, but they have changed back and forth over the years.

Load Data
Rainier recommends using commercially published jacketed bullet load data when loading our projectiles. There is no need for adjustment when using jacketed bullet load data. Our bullets are completely encapsulated in copper, creating a “Total Copper Jacket” (TCJ) through a specialized electroplating process, and are softer than traditionally jacketed bullets.

We recommend a starting powder charge between the listed minimum and maximum load found in various published and reputable reloading manuals.

A slight taper or minimal roll crimp may be used with our bullets. Over-crimping plated bullets may result in decreased accuracy, and can result in the fragmentation of copper plating.

Walkalong · May 17, 2021

An older post about plated bullets.

https://www.thehighroad.org/index.php?threads/380-plated-data.818632/#post-10500159

The good news is there is more actual plated data out there than ever before. The link above shows some of it.

ParallelCode · May 17, 2021

Thanks for the input guys, I very much appreciate it.

kalielkslayer · May 17, 2021

I’m not familiar with RMR, but a lot of guys on here swear by them

Berry’s rates their plated for either 1200 fps, or 1500 fps. Might look at the box and it’ll tell you because if you’re loading 85% loads with PP, you’re getting close to 1200.

RMR 115gr .355 plated load data

ParallelCode

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