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Post by 22boomer on Jun 11, 2014 8:49:34 GMT -5
The Love / Hate (or definition of insanity) relationship continues......... Sized cases tight and had excess headspace Bumped shoulder forward a bit and 1st shot beautiful (for a squib load, 5gr of Lil Gun) 2nd shot hard (same load) 3rd shot too hard for comfort. Took it down for cleaning and now I have a bulge (or two) in the barrel. Will cut the barrel apart when I get a chance........... Quch! Sorry to read you got the barrel ringed. I guess those squib loads where just that -- squibs. By the way, I was looking over on the AR57 site and they show the buffer for the AR57 to weigh 1 pound and the same weight for the semi-auto bolt. If that buffer weight is right it could help you jack the powder charge up some and still keep the bolt closed for the correct amount of time. I know this does not fit in with the idea of just changing the barrel in the 9mm blowback carbine but it's just a thought. I was just wondering -- is the rim on the 22TCM close enough to the rim size of the 9mm and 7.62X25 for the extractor and ejector to work. Just as a side thought, there are a lot of people that bought 7.62X25 DI carbine uppers when the milsurp ammo was easy to find and cheap. Now that the milsurp 7.62X25 has kinda dried up I was thinking they may be interested in switching over to the 22 TCM since loaded ammo is available and it's not too expensive.
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Post by HMC710 on Jun 11, 2014 18:52:08 GMT -5
Yes, it looks like the TCM is here to stay. If you look back a few posts, I've got buffers up to 25oz......... From an analytical approach, the tapered case and large body to bore ratio doesn't help with the blow back situation. From a pure numbers stand point, recoil should have been about 1/2 of the 9mm, not 4x greater. As far as the squib loads, one of my last successful rounds was the SS109 loaded backwards over about 2gr of Unique for a 1000 fps load. Pop, Pop, Pop. With the 17 oz buffer, we had a 2000fps load that worked well. This one was an Uzi load I was going to work up to work with rifle buffer / spring combo. I'll chop the barrel down to 8" and see what happens then.....
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Post by HMC710 on Jul 13, 2014 8:52:48 GMT -5
Got the pistol barrel set up and will set up some subsonic cast loads. Going to try this again with a pistol length set up with a 6" barrel. Still have some reservation on this as a blow back round but it is making me look at this total package. If the short barrel doesn't reduce some pressures enough we'll have to try something different.........
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Post by HMC710 on Jul 26, 2014 20:47:32 GMT -5
Loaded up some 45gr JFN and 55ht JHP over 5 gr of 4227 for the new 6" blowback pistol. The quick load computer is on the fritz so we'll have to chrono these loads to see where they are but I'm guessing 1500 fps range. The using our blow back adapter, the tok mag set a little too level in the well and we had nose down jams right in the body of the barrel. With the uzi set up we could only load two rounds at a time, but the stock uzi mags ran 100%. Now to get some load under 1.19 and try this again.
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Post by HMC710 on Aug 4, 2014 18:00:13 GMT -5
Can get these loads squeezed down to 1.2 and they just fit into the Uzi mags. Had a couple of nose down jams but fed about 90%. FPs were all over the range so this tells me that brass size, crimps, charge, everything has a big effect on the little round. Avg fps were 1465, far short of the 2000++ fps of the DI version and the TCM. Will load up a few more and see if we can get some strings shot out of this little guy.
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Post by thatfishguy on Sept 7, 2014 22:08:16 GMT -5
Hi Tim, I ran into a similar issue with the 22RE you helped me out with, i used 45gr jfp's to load down to uzi mag specs and while i could get them down to size, i found they shot somewhat erratically. I didnt have a chrony up so im not sure exactly how bad the spread was, but I could tell because the point of impact was all over the place. And though its a little off topic, I did manage to get my DI version running smoothly and got a few good groups this weekend. I found that A1680 is running surprisingly clean in the gas system.
-Sam
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Post by HMC710 on Oct 4, 2014 15:46:06 GMT -5
Hey Sam, good to hear from you. Actually got to the shop this weekend to take care of some things. Yes, the shorter you go, the more precise things need to be and things get erratic. The DI versions work well in the 22RE. I just got two more sets of dies in from CH4D. I'm looking at the 9x23 / 38 Super brass conversion to 22 which should drop them into an Uzi mag.
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Post by HMC710 on Oct 5, 2014 10:29:13 GMT -5
Got my 38 Super Comp brass in from Starline. The Super Comp is an (almost) rimless version (.394" rim vs .406" )of the 38 Super with a bit more wall thickness designed and used in race guns. Should be made to ordered for the AR. Got one set of 22RE dies that I will cut down .065" and form up some brass. I'll try this for the Uzi mags and if its not enough we'll go down to 30 Luger length of .850". The other thing I'm looking at is case taper as the 22RE has a bunch which I think is detrimental to the BB version. May have to work on that also.
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Post by HMC710 on Oct 6, 2014 15:44:20 GMT -5
Got my spare die set cut down today and will trim up some cases when I get back to the loading bench. Should come out to right around .900" when I'm done if I did my job right. Polished up the expander button and it looks like one of the "reverse" models Dave had mentioned with the bulge on the bottom. We'll run some regular 22RE through them and see what happens.
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Post by spaceman on Oct 10, 2014 10:16:41 GMT -5
Tim, You might be surprised to see that I've joined your forum. In case you are wondering why, I will provide a brief explanation. A couple of years ago I started yearning for something far superior to 22LR for small game. I considered 22WMR, but ammo is too expensive and besides I'd like it to be reloadable. I discovered that Savage had briefly offered a bolt gun in 5.7x28 which intrigued me, but after some research I decided that 5.7 isn't reloadable (at east not for me). Further research led me to a necked down 30C, which I am still pursuing. But another idea kept rattling around in my head all this time - a short stubby 22 round that would stack in a 9mm mag. Occasionally I would do a little research on that idea, which is what I was doing 2 weeks ago when I stumbled across this thread. Imagine my surprise! Well not really, great minds think alike, right? Anyway, it has taken two weeks for me to digest all of this. Man what an odyssey! At least you have been cutting metal - all I was doing was cogitating. I admire your perseverance (or insanity). Good luck! -Kerry
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Post by HMC710 on Oct 10, 2014 22:26:34 GMT -5
Hey Spaceman, welcome to the party! Well, lets just dispense with all the crap, here it is.... For lack of another name we are using the 22 Uzi, the three shiny rounds on the right side with the 9x23 on far left, a couple 22 Reeds Express, and the 9mm on the far right. To form the brass I just used brute force, lube, and got lucky. The 38 Super Comp brass formed OK but with some effort. One pass through the cut down dies and they happened to turn out. I have not checked neck thickness yet or tried to load anything up, just mock these up. Longer term necking down in steps would be easier on the brass. The bullets are the Armscor 40gr JFN and the Barnes 30 gr Varmit Grenades. Seated lengths are 1.190 and 1.170". Both rounds fit the Uzi mags just fine. Now to find the time to do another barrel........
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Post by spaceman on Oct 10, 2014 23:18:53 GMT -5
They're gorgeous. Thanks for the visual aid. Will a Hornady 40-gr Vmax work or is it too long? I think a C-mag will take a cartridge up to about 1.20" or 1.21" OAL, right? Is the Uzi the same or a little smaller?
-Kerry
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Post by HMC710 on Oct 11, 2014 20:11:24 GMT -5
This is as far as I've gone so far.
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Post by HMC710 on Nov 10, 2014 20:06:27 GMT -5
My drawing computer is on the fritz but plans are in the works to get a reamer drawing done and over to Dave Manson for a reamer for the 22
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Post by HMC710 on Jan 29, 2015 21:26:31 GMT -5
Have a trip to the shop planned next month (Woooo Hooooo!) so will try and short chamber a barrel for the 22 Uzi
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