Spread got a bit better with the heavier bullets, not much, but better. The 40gr Speer Varminter spread was 79 fps. I also have not put a lot of effort into case length and crimp, which with a small case, plays a big part.
Accuracy also tightened up a bit. I put a 2x scope on the pistol in place of the old red dot, but trying to see my small ink dot was interesting at best.
Last bullet tested was the Sierra 45gr SP. This was another long bullet like the Nossler which we loaded to 1.210" OAL and they both fit the CProducts mags. Spread on the Sierra was 132 fps with one round way below average. Without that one, spread was 64.
Pressure was also lower than the Speer 40gr SP, which was very hot for some reason
You were shooting from a pistol -- was that an AR pistol and what was the barrel length? I like the idea of only 3 grains of Bullseye -- should help to load many many rounds. Will you try to do the AR carbine in the near future with the same rounds? I would imagine if the Cproducts mags worked ok my Colt and Metalform 9mm mags should also work.
Now that is one cool looking AR pistol! The fact that you have a nice 22 cartridge that works in 9mm mags is a real plus and it's a blowback. Again, I'll be a pest and ask if you plan on testing with a 16" barrel?
I would really like to build a carbine around that little 22 Uzi but I was thinking maybe a gas system so I wouldn't all the reciprocating weight. The a gas system I could also run the little beast a bit hotter since it's a locked system. I'm not sure I could get velocities like I get out of the 22RE but I'd bet they would be close. Of course, with all the 9mm blowback AR carbines out there the blowback would be the best idea.
There is a company or person that is building an AR conversion that is running the modified 22TCM called the 22TCM 9R and is designed to fit in standard 9mm mags but I don't like it. Seems all they did was push the bullet further into the case to make the overall length shorter.
I don't like the idea and feel that your cartridge would be much better using 9mm subgun type mags with a better bullet and the possibility that the M1 carbine magazine with your M1 carbine magwell adapter would allow for the use of even longer bullets. If you did a DI gas system for the 22 Uzi along with the blowback it would allow for handloaders to work up some really nice velocities for DI system.
Do you have the water volume of the 22 Uzi available. I'd just wanted to compare it to my 22RE stuff.
We are showing 15gr H2O capacity in Quick Design- bullet volume and will get some more measurements when our new reamers arrive. Right now our seating die is a little undersize and squeezes things down a bit. I agree 100% on the 9R stuff..... but I bet it will sell because its there..... I would love to be taking pre-orders right now but this reamer thing has been going on way too long and I'm not going to under deliver. Back at the shop, unfortunately not under the best circumstances so we'll see what we can get done between duties....
More questions! Your 22 Uzi works out of a magazine like the Metalform 9mm magazine but does it also work OK with the standard 9mm AR magwell adapter like a RRA type magwell adapter? This would be important to myself and others that already have a 9mm BB setup and might want to convert to the 22 Uzi.
I was wondering if you could agree with this -- the 5.7X28 with a 40gr (ss197) bullet will go 1700fps from the five-seven pistol, the 22TCM with a 40gr bullet will do 2100fps from the Armscor pistol and you can get 1700fps with the 40gr Speer bullet from your 8" pistol AR. If you could get something like 2000fps with the 40gr Speer Varmint bullet out of the AR pistol or something like 1800 or 1900fps out of a modified Glock pistol you would have a real challenger to some of the existing rounds and something that would fit in a standard 9mm magazine. The 5.7X28 is a skinny little round that requires special mags but does work nice in the pistol designed for it but the brass is a pain to reload. The 22TCM actually requires a special magazine for the more normal or standard round (38 super magazine) and the odd 22TCM 9R will work in 9mm mags but the choice of bullets for reloading seems real limited. If there is a way to increase the pistol velocity and maybe get some good velocities out of a carbine barrel your 22 Uzi could be a real challenger since it fits and works in 9mm mags and is able to work with a good variety of bullets. I hope your testing continues with good results.