[mdi255]

I hope so! 45 ACP is one of my favorite cartridges and I just added 45 #4 to my stable…

[mdi255]

I believe you are using the Lee Collet Crimp die, not the “post crimp sizing die”. The collet crimp die squeezes the case neck and the “carbide” FCD (for handgun calibers) uses a regular taper or roll crimp and the as the case is extracted, the carbide ring removes any bulges and insures the cartridge is in factory specs. Never heard of any problems or complaints about the collet crimp dies. I use 3 of Lee’s collet crimp, 2 handgun and 1 rifle and the only “carbide crimp die” I owned now resides in a landfill somewhere in southern Oregon…

• This reply was modified 8 months, 1 week ago by mdi255.

[mdi255]

When reloading a new to me bullet I’ll find a similar bullet in my manual(s) and start a dummy at the book OAL. Make sure there is no flare left on the case and plunk test it. If necessary shorten the OAL .005″ and repeat plunk test.

I have had more problems with case gauges than I care to list, so, I shoot my handloads out of my gun’s barrel and not a gauge, so I size my handloads to my guns. Works for me for 25+ years…

[mdi255]

When I started reloading the RMR 124 gr JHP (Multi Use?) I compared them to Nosler 124 JHPs and they were physically very close (diameter and length). I used Nosler data quite successfully. I used the same data for my RMR Nukes.

[mdi255]

I would think you are unnecessarily limiting yourself and your troubleshooting; only one magazine, only one manual? Have you tried contacting RMR? I have and gotten good data quickly (looking for data on velocity requirements for Multi use bullets.).

[mdi255]

My first RMR `124 JHPs looked very similar to Nosler bullets. IIRC I measured same length, weight and profile so I used Nosler data. And like “Reloading 101” says, begin with starting loads and work up…

I have not found an “exact match”, load data specifically for the RMR bullets and I don’t know if any even exists. I did not interpolate anything I used Nosler 124 gr. JHP data for my RMR bullets straight from the book and plunk tested in my guns. I use a lot of Universal, CFE Pistol, Unique, W231, and BR-5 in my 9mm handloads…

Been reloading for a few decades so I trust my judgment and data sources. I had one squib in 1970 and no kabooms or over max loads…

[mdi255]

A couple thoughts; Have you tried different magazines? When I started reloading the Multi Use 124 JHPs I noticed a close resemblance to Nosler bullets so I began with Nosler data. The Lee manual is just OK, but it’s the last manual I look at for data. For RMR bullets I use my Nosler manual (but I have manuals from all the bullet manufacturers’ bullets I use)…

[mdi255]

Find the data for a similar size, weight, profile bullet in your manual(s) and start with the book OAL. Plunk test and adjust if necessary… I have 4 9mm pistols one, has a shorter chamber so I reload to fit that gun, Masada9mm, and it works in all…

[mdi255]

Early on in my reloading, I experimented with a lot of different “substitutions”. Way pre-web and mainly out of curiosity, not necessity. I had revolvers so I had not FTF problems with rifle primers in pistol applications. Didn’t have a chrony at the time, but found very little noticeable difference. Of course as with any change I did another load work up and only substitution I didn’t do was large rifle in large pistol applications (large rifle primers are .008″ taller than large pistol primers. No problems substituting magnum primers for standard primer, but my results were from a new load work up. Don’t know where I learned it, but “Reloading 101”, do another load work up any time a component is changed…

[mdi255]

There is a ton of data in most published reloading manuals and powder/bullet manufacturer websites. My first loads with RMR 124 JHPs was right out of my Nosler manual. Worked great.

FWIW; I pay very little (no) attention to any data I see on a reloading forum, hear from any gun counter clerk, “favorite loads” forum/website, good intended friend, range rat, or gun shop guru. I get 98%+ data from published reloading manuals with some from powder/bullet manufacturer’s web sites. I have been using this, my “Rule #1” for over 40 years and had one squib in ’70, and no Kabooms,. Added to this I record every load and results so I can go back and use that data for further use/experimenting…

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