bullpen7979
06-10-2016, 10:39 AM
Greetings all,
How does one determine the proper powder charge for "in-between" load data? For example, Im using BE86, and I have the following load data for 9MM Luger.
http://www.alliantpowder.com/reloaders/powderlist.aspx?page=/reloaders/powderlist.aspx&type=1&powderid=38&cartridge=23
In this example, for a 125 grn LRN, the table calls for a 5.7 grn charge with a COAL of 1.12. My CZ P01 wont chamber cartridges of that length reliably. I need to be around 1.07-1.075 for this pistol. I also have an MP Shield, also in 9mm, and I wanted to come up with the load that shot best in it, and that the CZ would also chamber.
My question is this: How does one properly calculate powder charge for a shorter OAL than the table calls for?
I have been loading 4.7 grains, and the shield groups well (for me) with this load, with no signs that I can see of high pressure. Primers arent flattened, no blowback around the primer cup, no FTE's, etc.
This was merely an educated guess on my part. I see that the load for 147 gr at 1.08 is right about the same, so I felt fairly safe here, but I was wondering if there was a science to this. A ballistics program I might employ? I remember a program named Quickloads or something to that effect? Are there others you boolit masters use?
Also had another question regarding a choice of centerfire caliber, but I thought I'd post that seperately
Thanks and regards,
MP
How does one determine the proper powder charge for "in-between" load data? For example, Im using BE86, and I have the following load data for 9MM Luger.
http://www.alliantpowder.com/reloaders/powderlist.aspx?page=/reloaders/powderlist.aspx&type=1&powderid=38&cartridge=23
In this example, for a 125 grn LRN, the table calls for a 5.7 grn charge with a COAL of 1.12. My CZ P01 wont chamber cartridges of that length reliably. I need to be around 1.07-1.075 for this pistol. I also have an MP Shield, also in 9mm, and I wanted to come up with the load that shot best in it, and that the CZ would also chamber.
My question is this: How does one properly calculate powder charge for a shorter OAL than the table calls for?
I have been loading 4.7 grains, and the shield groups well (for me) with this load, with no signs that I can see of high pressure. Primers arent flattened, no blowback around the primer cup, no FTE's, etc.
This was merely an educated guess on my part. I see that the load for 147 gr at 1.08 is right about the same, so I felt fairly safe here, but I was wondering if there was a science to this. A ballistics program I might employ? I remember a program named Quickloads or something to that effect? Are there others you boolit masters use?
Also had another question regarding a choice of centerfire caliber, but I thought I'd post that seperately
Thanks and regards,
MP