Range results, 8" &16", RE7, LilGun, Blue Dot, AA9, SR4759, & AA1680

[Alleycat]

Noveske states on their web page that their Blackout barrels will not cycle subs without a suppressor. You may need to open up the gas port a bit.

http://http://noveskerifleworks.com/...status=&title=

[Titleiiredneck]

If you have a extra spring cut a coil or two off, and lighten the buffer. Never shot with a "pistol recoil spring", so I have no idea on that since always using my sbr lower but cutting a coil or two at a time may solve it.

[Ned christiansen]

Kinda surprised about the Blue Dot load. Not that there is a correlation, but my bowling pin load in .45 ACP is more than 10 grains of it (depending on lot) with a 215 grain cast bullet. I'da thought .300 AAC BO would very easily handle your load.....

[snipecatcher]

Originally Posted by Ned christiansen

Kinda surprised about the Blue Dot load. Not that there is a correlation, but my bowling pin load in .45 ACP is more than 10 grains of it (depending on lot) with a 215 grain cast bullet. I'da thought .300 AAC BO would very easily handle your load.....

Two whole different animals. With the .30, you are pushing a long bullet with a lot of bearing surface through a narrow bore. I tried a similar load with Red dot and blew out a primer. The pressure spikes dramatically within 1 grain. Powders that fast are not suitable for the BLK/Whisper.

[rumlover]

I'm not sure of the proper name for the spring that came in the pistol lower from RRA, but it is noticably stronger than the springs in my carbines/rifle lowers.

The Noveske is what is ticking me off. I expect flawless performance for that price. The 1680 load at 10.8 grains will cycle the action, but velocities are running in the high 1100's with Hornady 225's. WTF!

[rumlover]

The post above torqued me off enough to call Noveske. They gave me some idea...well basically reaffirmed my ideas. Of note...they are noticing that Rock River is putting stronger springs in their lowers compared to DPMS, Colt and Stag. That will probably fix the 16".

On the 300W 8", they pointed out that it's the static mass that keeps the bolt in place long enough for the bullet and gas to dump out of the muzzle, and to a lesser extent the spring compression. Consequently, by putting a weaker spring (like the colt that was in there) with a heavier BCG and buffer, it may function.

[sgms18]

Noveske should be able to tell you gas port size w/out you having to tear it apart. Thats really where you need to start. Personally I think the high end ar stuff like Noveske is way over rated and stupidly priced. A good quality bbl and mil spec parts will do anything 99.9% of ppl wana do. I have run 1000s of rounds in semi and full auto(RLL) in my S&W MP15 $800 gun, and my Model 1 Sales 5.45x39 $600 gun AND my whisper was originally a Model 1 5.56 gun, all I did was get a bbl from Spook and swap em out.

[rumlover]

Probably true, but I wanted a quality upper that was ready to go. Shooting 25 round 1 MOA groups (side to side, not center to center) with supersonic ammo at 100y meets that desire. I just need to find a combination of buffer/spring/bufer tube that will work correctly. The evening I recieved the Noveske upper, I took it to the NRA HQ range sitting on top of my service rifle rock river lower with a rifle length buffer tube/spring/buffer combo. With 225 Hornadys over 10.6 grains of 1680, it cycled fine. When I put it on a brand new Rock River carbine lower and tried the same loads, it didn't work. (a little fact I didn't realize until a few days ago while trying to figure out what was going on).

After talking to Noveske this week, I went back to check the buffer tubes and springs in each of my 300 WTF;s and found that the new pistol and carbine lowers I bought have thicker, 2 coil longer springs that take more pressure to compress than the Colt lowers I have. They also have a rougher interior to the buffer tube than the Colts and the RRA Service rifle lower that I have logged thousdands of rounds in. Consequently, I ordered 2 DPMS springs, a Cot H and H2 buffer and a Tubb BCG weight addition. Between all those and what I have, I should be able to find a winning combo.

BTW: I just got back from the range where I shot the Noveske upper with 240 SMK's over 10.7 grains of 1680. It cycled fine and put all 10 proof rounds into .45" at 50 yards. That tells me it's on the border of resolution.

As for the pistol upper, I've got some more test rounds loaded with 1680, N110, and RE7. Once the new springs come in on Tuesday, I'll run through all the combinations until I find a winner. I've gotten great accuracy from this little barrel, I just need to marry it up to the right lower. I'll also take a Colt and DPMS carbine lower as well to see it that makes a difference (quality of buffer tubes).