300 Fireball AR15 (Brass forming - post #150)

Loaded subsonic, it's still loud as hell - but isn't nearly as loud or "flashy" as a shorty in 5.56. This makes it a joy to shoot, even if the ammo takes time and effort to make.
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When the intial upper was being tested at an indoor range the guy sitting beside asked about the rifle cause it was soooooo quiet compared to a normal shorty AR which tend to be fairly obnoxious. And that was shooting supersonics! :)

It is also nice to be able to use cheap pulled mil surplus 147-150gr bullets and small charges of powder. As Doc has shown, brass can be made from cheap, plentiful .223 Rem cases. So other than a bit of work to make the cases, this thing is actually quite cheap to shoot.

Another one will be built soon . Just waiting for my 16" barrel to get here from ATR.
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It went in the mail late last week. It is all up to the postman now.

Think it was sitting on Peter's desk about to be shipped last I saw....
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Aren't you supposed to be home sick and not playing on the internet ? ? ? ? ? ? :jerkit:
 
Thanks boys. Doc is using 221 Fireball brass right? I read about this round in my latest Hornady manual. It srtuck me as interesting and I think they used 223 brass for it. So at present there is no commercial supplier of brass?

The rifling rates, did you guys choose them for specific reasons? Suputin's 1 in 8 would be better for heavier subsonics being suppressed I'm guessing.

http://www.youtube.com/watch?v=c1FIs0FDmFQ

This video looks like the way to go!
 
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Yes, I used the .221 for a start - but am slowly nibbling into a pile of 5.56/.223 brass as time goes by. The fact that the chamber is cut to allow use of the thicker-necked .223 neck-downs without turning (something I haven't tested yet, but which I'm told based on the reamer specs when Suputin went back and looked at them again) will speed up the process almost tenfold.

Suputin's 1:8 is the ideal barrel here; I wanted one, but we didn't know what the wait time would be (and it had been a while already). When offered the option of a 1:10 with the caveat that I'd need to stick to 200 grainers or below, I said "deal." And yeah, the ATRS guys get to play with suppressors because of their licensing... while I don't, because the government doesn't trust us 'plebs.' :(

If I were to build a bolt gun in this chambering, it would have a 1:8 twist almost definitely. And I will, someday... ;) That's one that I COULD hunt with.

-M
 
JasonS said:
Yeah I've watched some boltgun videos. Almost zero recoil and the longer barrel when suppressed is real quiet.
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Zero recoil - sweet.

Suppressed - in this country I suppose the point is moot, sadly.

But it's fun to watch on YouTube! :) I admit I've probably watched every single .300 Whisper video out there right now...

-M
 
Slowly coming together now.... :)

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I'm just glad I bought that Daniel Defence rail used, for like $200.....cause I'm going to have to mill some holes just to get at the gas block set-screws, and gas adjustment....no big deal. :)


Have you played with any subsonics yet???



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simpleton said:
I'm just glad I bought that Daniel Defence rail used, for like $200.....cause I'm going to have to mill some holes just to get at the gas block set-screws, and gas adjustment....no big deal. :)


Have you played with any subsonics yet???
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I've been playing almost exclusively with subsonics... my supersonic loads have been as an intentional "start high" and "work down" approach. :)

I've got my rig tuned for 100% reliability with 180gn subsonics now, it's pretttttttty slick!

PM me for tips - I'm not putting this hard work up openly, frankly.

-M
 
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