|
Post by 22boomer on Jan 27, 2015 15:09:10 GMT -5
Tim, Do you know if anybody is shooting heavy bullets in your carbine upper with the short gas system? I'm interested in jacketed bullets in the range from 110gr to 168gr. If you know or somebody reading this knows, I would also like the powder used and the weight of the powder. I have a 7.62 mini-whisper but would like to play with heavy bullets in the barrel I got from you years ago.
Thanks, Charlie
|
|
|
Post by 22boomer on Jan 29, 2015 7:35:57 GMT -5
I really like reloading the 7.62 using the heavier bullets and was hoping somebody could give me a bit of info on what to use with the short gas system. below are a few of the cartridges I reloaded for the 7.62 mini-whisper. They are 125gr bullets. Below is a picture of 168gr bullets in background and 110gr bullet up front. This is what I'm talking about but due to the shorter gas system on Tim's 7.62 barrel I figured a different faster powder was needed than what I've been using in my Whisper. Please -- any help or info would be greatly appreciated!
|
|
|
Post by HMC710 on Jan 29, 2015 21:17:13 GMT -5
Hey 22 I run everything from the 85 JRN to 240 SMK's with our shorter than pistol gas system. I've put some adjustable gas blocks on the few of the latest builds to tone down some of the heavy subs.
|
|
|
Post by 22boomer on Jan 30, 2015 7:35:30 GMT -5
Hey 22 I run everything from the 85 JRN to 240 SMK's with our shorter than pistol gas system. I've put some adjustable gas blocks on the few of the latest builds to tone down some of the heavy subs. I was thinking that an adjustable gas block might be a good modification to the system since, I believe, I have one of the original designs and won't allow me to add a set screw adjuster for the gas. What commercial adjustable block did you use or did you make it? What powders do you use for the different weight bullets? I have a lot of load info for my mini-whisper setup but I was thinking that these same powders might not work well with the shorter gas system. I wish I could install a full float handguard but with the existing gas block so close to the barrel nut it would be a real problem with most FF's I've seen. Thanks for the reply -- I was getting worried that nobody shot heavy bullets in this setup. It's kinda funny that people don't seem to realize that the subsonic velocities of the 300 Blackout can be duplicated with the 7.62 Tok setup using a good number of the heavier .308 bullets.
|
|
|
Post by HMC710 on Jan 31, 2015 10:44:16 GMT -5
I run between 5.6 - 6.0 gr of AA #9 with the 180 + bullets, 6.5-7.0 of Lil Gun with the SSP180's, and 3 - 5 gr of Unique. All loads depending on bullets / barrel combo but you can drop 1 - 2 gr over the 300 BO because of higher efficiency. These are the Lee 180, Lee 230 5R BO, NOE 247 Hornady 180 SSP & 240 SMK
|
|
|
Post by HMC710 on Jan 31, 2015 10:50:25 GMT -5
For the gas blocks I've run a couple of BTE low pro adjustable with success. I just placed another order with them to I can have stock on hand. Most FF tubes work fine with our gas blocks, that was a sticking point with me. Even our very first ones worked with FF tubes. They looked good but took a lot of time to make by hand.
|
|
|
Post by 22boomer on Jan 31, 2015 17:33:09 GMT -5
I really like the idea of using Unique powder since it's fast and in this case not much is needed -- easy on my powder supply. I appreciate the info and will try doing some test rounds. Also, I like the looks of the BTE adjustable gas block. I'm just not sure that I can do any gas tube bending to make it fit.
My problem with the Free Float handguards is some of the newer versions come with a real long barrel nut and I'm not sure there will be enough room for the gas block that I got with your barrel but I can do some measurements and see. Actually, for now, I'm more interested in testing some rounds with the Unique powder than spending money on a FF tube. I will be honest -- I tried cast bullets of the 22 caliber type and really did not have much luck with them but I feel it's just me and not the cast bullets.
|
|
|
Post by 22boomer on May 18, 2015 12:24:38 GMT -5
Just started playing with the shart gas system 7.62X25 Tok again. Right now I'm at 8.0gr on #9 behind a 168gr Nosler silver tip. I'm using a slightly modified Magpul magazine and the rounds lock the bolt back every time. I would like to get into the heavier cast bullets but when I shoot them they act really different than jacketed bullets. A little bit of powder with send the cast bullets flying but not work the AR action enough to lock the bolt back after the last shot. The picture below is what I've been shooting. It's the 168gr Nosler at an over-all length of 1.85" next to an empty .223 cartridge case on the left and a 25 cent piece on the right. I'm sending Tim a barrel to modify so I can use it in one of my manual AR upper reeivers so I can shoot very reduced powder charges under those cast bullets.
|
|
|
Post by 22boomer on May 19, 2015 9:29:44 GMT -5
Right now I've been testing with the Nosler 168gr silver tips with 7.5gr of #9 and they feed fine from my magpul magazine and the bolt locks back after the last shot.
|
|
|
Post by HMC710 on May 19, 2015 16:59:38 GMT -5
+2! #9 and Lil Gun are good powders to use for the heavy bullets. Do it right and a pistol gas system will work. If we could get Remington or Winchester to make a "gas" load, we could run 9mm on a pistol length. BTW, been doing some interesting testing on the pistol cartridges....
|
|
|
Post by 22boomer on Jun 11, 2015 8:32:07 GMT -5
Tim, In the picture of the newer type gas block and gas tube how hard was it to do the bends in the AR gas tube. I want to try bending a gas tube and I'm not sure how to do it without getting a crimp in the tube.
|
|
|
Post by HMC710 on Jun 11, 2015 17:22:24 GMT -5
Its simple charlie, you make a jig and test, and make a jig and test, and make a jig and test....... Trust me, I've seen some stuff sent to the shop that have been bent with vise grips and a 10lb hammer and they seem to work. Try three dowels in a vise, get the picture? lay two on the table, put gas tube on it and put the third in the center: press down. anything with a gap will work.
|
|
|
Post by 22boomer on Jun 11, 2015 19:40:36 GMT -5
Tim, That's what I kinda figured. I've done longer non-standard tubes before but was not sure about a really short tube.
|
|