Keith,
I’m curious what powder and load you are using…just for research on my part. I have seen that RMR seems to need to run deeper however most JHP’s that I see indicate greater than 1.1… most of my loads are running at 1.125 with Speer, berry, MGold, and a wide variety of powders. As well, that’s running from various chambers. The deepest I see would be XTP’s and some various plated bullets. I suppose the ogive on the nuke needs to seat deeper but as you know, the deeper you go the pressure goes up. So what I don’t know is what the reference point is for “unknown” COAL as folks like Berry and RMR do not suggest any loading data. The general rule being to start low and work your way up. But, what is low ? Isn’t it possible to get it too low and end up with a squib that you hope to catch ? Hopefully, you’ll see the signs if its too high or before its way too high.
So I suppose my question is, how did you get to a OAL of 1.075 ? Was it using bullets of similar design? Or was it starting at where the chamber would pass the “plunk” and working up or down from there ? I find this fascinating as the 9mm being a straight wall case, chambers on the case mouth. Again, working through my own loads and am just curious.
