9.3 gr and brass still looks good. I mis-spoke earlier about cases bouncing off the deflector, the upper is a slick side....... 9.3 gr might be flattening primers a bit, maybe. Cases still look great. Sized necks are .328" and fired necks are .334" Shoulders gone from .378" to .380" and are a bit sharper and more defined. Bumped up OAL from 1.18" to 1.19 and that is max with the Colt mags.
Up to 9.7 gr and things still look good. Primers are starting to flatten, but shoulders look great. Big difference between the 22 and the 30, but kind of comparing apples and oranges. Comparing the 30 Luger to the 30 UZ opens things up a bit, but they are closer on max loads than the 22's.
9.85 and still going...... 10.0 gr and things are starting to get stiff. I would compare this load to the 8.5gr load in the 22 UZ without the Delay Device. 2400 is a great powder as the case is 100% full at 1.19" OAL and predicted 1636 fps from the 8" barrel. Max load per QL is 10.4gr and 1700 fps..... 10.2 and climbing...
Past 10.4 and up to 10.6 gr of 2400. Just starting to get a hint of primer cratering. I'm using S&B 4.4 SR primers, same as the 22 UZ. Cases look grood, but these are 9x23 Super Comp cases with a 45,000 psi design. As a note, the Glock would not reliable fire these and had to switch to CCI SP primers. So, lets see if we can hit 11 gr!
I blame it on Quick Load! Remember we aren't dealing with 3" - 5" pistol barrels anymore so these are more like small rifle rounds. All I;m doing right now is testing and firing into my test chamber at the shop. All that other stuff will come later at the range. Deer season opens sunday up here so I don't want to tick off the neighborhood I cut the 9x23 cases about .060", chamfered, and ran them through the 30 Luger size die. They came out about .345". I ran the Lee seating die to where it just hits the case mouth, so I would say light crimp.
Yes, the 30 Luger is running with stock 9mm blow back parts. We are working on 4 Delay Devices to help improve ballistics (more power) with less mass (or no net gain) in the base AR-15 Blow Back platform. Our goal is to be able to retrofit the 9mm blow back uppers with more powerful rounds without beating up the components. After building buffers up to 25 oz to try and tame the high power blow backs, there had to be a better, lighter, way. That involved mapping out the AR-15 and applying the standard forces as the system operates. Then we looked at where we can add forces (with all due respect to Mr Chinn )to help retard initial bolt movement. Out of our four current plans, DD1r0 is operating with about 500 rounds through it so far, and, is effective at retarding initial bolt movement allowing us to safely increase the power of the 22 UZ round. Can we get to locked bolt performance? Well, that is the goal and I firmly believe that DD2 has the capability of doing that. Why not just do a DI version you ask? For one, you can't use your blow back parts. Two, in order to get the pistol calibers to work you need super short gas systems and running the numbers puts the chambers under pressure with slower powders and shorter barrels, in effect, having a blow back situation. A 9mm DI with the gas port at the case mouth vs a 5.56 mid length port, starts unlocking the bolt in about .05ms vs 1.1 ms for the bullet to travel down a 16" barrel at 1400 fps. Depending on how you calc the speed of the carrier to travel .320" to unlock, watching one in operation with fire coming out the chamber and dirty case mouths, tell you its under pressure.
Got Barrel #1 done on the cnc lathe today and have to make some adjustments to get the numbers where we need them but the majority of work is done. I've got a stack of 10" blanks to put through the machine and then chamber them to 30 Luger. When our new reamers get here, we'll bump them up to the 30 Slugger!
Prepping the 30 Luger barrels in the manual lathe and then transferring to cnc lathe. Had a bit of taper so we made some adjustments today. Going to see if we can know out a few of theses and get them on the shelf!
Got back to the range today and the weather was great, dry and 55! The 30 Luger ran like a champ using slightly reduced loads from testing up at the shop. Loads of 10.5 gr of 2400 under the 86gr JRN we consistently hit 1750 fps from the 8" blow back AR. Spread was better than the 22 version averaging only 35 fps. Do we have a Tokarev killer in the works? Stock parts, cheap adapters, and bolt hold open with the right mags
Doing some reloading on the 30 Luger and playing with Quick Load. Running the OAL out to 1.6" to fit in an M1 Carbine mag we can stuff a Sierra 168 MK with a case full of 2400 and we have our version of the Moscow Match Tok load. I've got one barrel I gave a little more throat to and the sub rounds fit right in. We'll try to load some up tomorrow and hit the range if the rain holds off. Then, I guess, I'll have to see if we can do a carbine conversion....