Welcome to THR.
You will likely receive better replies if posted on "Handloading & Reloading" category (I will PM a moderator to move the thread) -
https://www.thehighroad.org/index.php?forums/handloading-and-reloading.15/
Disclaimer: Since we are all human with capacity to make mistakes when copying/pasting load data, always verify forum posted information with published load data.
124 gr Berry RN ... Bullseye ... looking for Load Data
Alliant ... site ... only showing ... HP
If you are using regular plated Berry's RN bullet with solid base, I have found using lead load data to work well as when I used jacketed load data, accuracy deteriorated above mid-range jacketed load data. If you are using thicker plated Berry's hollow base RN (HBRN-TP), I found I could use jacketed load data without loss of accuracy.
2004 Alliant load data does list load data for 125 gr Lead bullet and FMJ and since bullet weight can vary by 1.0+ gr, you can interchange load data for 124/125 gr bullets -
https://www.thehighroad.org/index.php?resources/2004-alliant-load-data.18/
- 9mm 125 gr Lead (Likely RN) Bullseye OAL 1.150" Max 4.9 gr (1,165 fps)
- 9mm 125 gr FMJ (Round Nose) Bullseye OAL 1.150" Max 4.9 gr (1,155 fps)
Note: When start charge is not listed, reloaders usually subtract 10% from max charge and use it as start charge.
But if you are using
shorter OAL that increases chamber pressure, you may want to reference other load data or reduce your start/max charges (I usually reduce .2-.3 gr if I am using shorter OAL than published based on how much shorter OAL).
Here's Speer lead load data -
https://reloading-data.speer-ammo.c...gun/9mm_caliber_355-366_dia/9mm_Luger_125.pdf
- 9mm 124 gr Lead RN Bullseye OAL 1.130" Start 3.5 gr (929 fps) - Max 3.8 gr (962 fps)
And Speer load data for TMJ (Total Metal Jacket) which is thick plated RN bullet that can be driven to jacketed load data -
https://reloading-data.speer-ammo.c...m_caliber_355-366_dia/9mm_Luger__124_rev1.pdf
- 9mm 124 gr TMJ Bullseye OAL 1.135" Start 3.9 gr (966 fps) - Max 4.4 gr (1059 fps)
And Lyman #49 lists the following: (Weight listed in Lyman Reloading Handbook is without the weight of lube so factor adding a few grains to the listed bullet weight - So 120 gr bullet would be comparable to 124 gr with weight of lube added)
- 9mm 120 gr Lead RN Bullseye OAL 1.065" Start 3.4 gr (939 fps) - Max 4.2 gr (1175 fps)
As to load development and powder work up, when I am using different bullet than what is listed in the published load data, I will review all available load data and reference more conservative load data for my initial powder work up, especially if I am using shorter OAL as I can always go higher.
And before you conduct your powder work up, you should determine the max OAL by using dummy round (No powder, No primer) in the barrel known as the "Plunk Test" and then determine the working OAL by feeding/chambering dummy round from the magazine (Releasing the slide without riding it) and incrementally reducing the max OAL by .005" until you have reliable feeding -
https://www.thehighroad.org/index.p...rel-find-a-max-o-a-l-with-your-bullet.506678/
Then using the working OAL, conduct your powder work up from start charge by loading 10 rounds of .2-.3 gr increment to first identify the powder charge that will reliably cycle the slide and extract/eject spent cases and then monitor accuracy trend to identify the powder charge that will produce smallest groups.
If you want to squeeze out more accuracy, once you determine the powder charge that will produce the smallest groups, incrementally reduce the OAL by .005" to see if group size gets smaller.
Here are some step-by-step reloading guide and tips that may help you -
https://www.thehighroad.org/index.p...-and-discussions.778197/page-10#post-11419509