AK47 suppressed vs. .300 Blackout suppressed?

[Artful]

I have chronographed a few different 7.62X39 loads in an SKS and most run 2,400 to 2,500 fps here in the summer. My 18" Contender barrel with 1 in 8 twist will do about 2,200 fps with a 125gr Nosler BT. Seems the edge goes to the X39 by a healthy margin.

Actually the heavier the bullet weight the less the edge and remember for subsonic the limit for Velocity is speed of sound conditions (a little over 1000 fps), and the 300/221 can make that speed with less powder so less gas pressure to have to suppress.

I haven't loaded any full power 110gr jacketed loads in my barrel but is this the bullet and velocity figure you are comparing to the X39?

I use both 221 expanded up and 223 reformed to 300 W. I do not have to turn necks on my brass.
I thought I read that the 300 BO was designed so the necks did not have to be turned. Am I incorrect?

The chamber is the determining factor if you have a true tight necked JD Jones 300 Whisper chamber you should not be use unturned 223 formed Whisper brass.
300 Blackout chamber is larger in the Neck to eliminate the danger for those that use 223 to form cases.
But one who necks brass down should always measure and check their loaded rounds to assure the brass has room to let the bullet go, as that process thickens the neck. When you neck up it thins the brass neck so less chance of a problem.

I don't understand the reason the BO was designed as the Whisper works and the 300/221 is pretty much the same and gets around J.D. Jone.

Blackout was designed by AAC/Remington to be a SAAMI cartridge, with uniform dimensions as the 300/221 or 300 Fireball or any number of different chamberings all differ slightly in dimensions - it also was designed to fire 300 Whisper ammo and to use necked down 223 without problems as opposed to 300 Whisper which was designed to use necked up 221 fireball brass which makes for thinner necks.

Is there something about using the Whisper in an AR platform that gives problems?

Nope, Whisper will work fine in the AR platform it's that the cartridge was never SAAMI spec'd and the legal requirements put forth by J.D.Jones the copyright holder. Remington would be like Hornady, RCBS and Thompson/Center and pay J.D.Jones for each product marked with 300 Whisper

http://www.quarterbore.com/300whisper/jdnote.html

[Russel Nash]

Artful wrote:

As far as the pricing of a suppressor, remember you are also paying for all the people in the back office doing the paperwork and the R&D for better products. American rifle suppressors generally speaking are not freeze plugs or flat washer designs.

Yeah, I have seen that picture before. It is really, really cool! I'd be curious as to who actually took that Xray and/or who the first was to post it.

Yeah, this past week I have had some time to kill so I have been image google searching M and K baffles and Nielsen devices and DeLisle designs, etc.

I would be curious to see actual results of say a homemade suppressor versus something from AAC or Gemtech with decibel meter results nearby.

My point being.....other than me being a cheapskate stuck behind the Iron Curtain of Illinois where NFA stuff is verboten...does paying out say an extra $700 for the real deal net you that much more in decibel noise reduction versus a homemade jobbie???

Oh, yeah, I understand that there are engineers, CAD programmers, machinists, CNC booths, raw materials purchasers, salesman, marketing staff, etc...etcetera to pay for when a seven hundred something dollar suppressor gets sold.

Just my rudimentary knowledge of suppressors I have gathered you have to slow down the gases/air....there's more to it, I know, but I dont' want to ramble on.

[Artful]

You like X-rays check out Steve Miller's work
http://www.laumont.com/laumontGallery.html
http://www.everydaynodaysoff.com/201...ay-gun-photos/




Comparisons are out there but not always free
http://www.youtube.com/watch?v=JyTjl...Q-aGHaCuRbilrF
http://www.youtube.com/user/arevalosocom/videos
also check out
http://www.silencerforum.com/forum/forum.php
here's some old ones from Mr Silver's original Silencertest.com
http://silencertalk.com/results.htm

Someone with good background in suppressor design/mfg could make a home made suppressor without too much effort for a 22LR but I'd want all the professionalism I can get with a 308 can. - for 9mm you might be able to copy someone's work and make something decent if you had prints/pic's/x-ray and the machine shop and skills to do the work. But remember once you file your form 1 and get approval it's only for making it once. You can't register a tube and keep remaking the innards for that you need to become an SOT.

[leadman]

I think 303Guy makes his own suppressors, but he is in New Zeeland.

Is it legal for a private individual to make a silencer as long as they pay the tax? I know an individual can make a gun for himself, but if he did it for others he would have to be licensed.

My "300 Whisper" is not an SSK barrel. another custom builder here in AZ. made it at least 10 years ago. I bought it used from a gun shop. The neck is about .020" longer than the true 300 Whisper. For awhile I was refoming the 223 to 300W and trimming it longer, but I also have necked up 221 so decided to just use that length. I saw no major advantage to the longer brass.

[Artful]

You can make your own silencer/suppressor with Form 1 approval - you will have to decide upon diameter the can will accept (9mm, 30 cal etc) and the outside dimensions of the can to put on the form 1 before submitting it. If you decide to do this as an individual you will need MCSO signoff and the Form 1 will need fingerprint cards and passport sized photo's of the applicant. If you create either LLC or Trust then you can skip the MSCO/prints/photo's - Remember you'll need the ability to make the can or you must be present while anyone works on the raw materials for your suppressor.

[leadman]

I have a old small Craftsman lathe and the trust. Many of my guns have threaded barrels with brakes on them that part of the job is done. Now I need to work on my knowledge and skill level on the lathe.
Can a supressor be moved from gun to gun legally? I have several 30 calibers, including the 300 Whisper that one can would work on if it is ok to move it.

[Artful]

Yep, you can move it from gun to gun - I use the same can on Mosin-Nagant 7.62x54R, all my threaded 308 rifles, 243 bolt gun. For subsonic only you can use a 9mm can on your 300 whisper without problem - so if the can you make is cleanable you can use on 9mm, 38 spl, subsonic 300 whisper, 22LR
basically anything smaller than 9mm with same or lower pressure at the muzzle.

[Russel Nash]

youtube search results:

http://www.youtube.com/watch?v=r7p9nuylaag

you can see the gases spiraling around in this slo-mo video:

http://www.youtube.com/watch?v=fPqa3...eature=related

http://www.youtube.com/watch?v=86-TF...endscreen&NR=1

http://www.youtube.com/watch?v=c1b6mthrUJc

http://www.youtu.be/watch?v=0nPaV1jwKDo

google search results:

http://www.modernrifle.com/forum/vie...9231&start=200

http://www.ar15.com/forums/t_6_20/28...ze_plugs_.html

http://en.wikipedia.org/wiki/Suppressor

[Russel Nash]

DISCLAIMER: I don't know about all the various features that other manufacturers build into their suppressors, but I thought these guys had a couple of good ideas:

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

[Artful]

DISCLAIMER: I don't know about all the various features that other manufacturers build into their suppressors, but I thought these guys had a couple of good ideas:

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

Notice the amount of blowback coming out the ejection port - that's one reason I like 308 can on my AR - it cuts back on that and makes a deeper tone.

[Russel Nash]

if you are shooting an AR in the common nose to charging handle position or form, with a suppressor on, do you get more gas escaping around the end of the charging handle and squirting you in the face or eyes (even with safety glasses on) ?

I know at least one company makes a "gasbuster" charging handle. It is milled with channels or ports on the underside so that the gases escape through the side and not straight back at you.

[trickyasafox]

to be honest, the 300 aac blackout was attractive to me because I could use my NY compliant high capacity mags. That makes sense for a lot of us in ban states.

[Artful]

if you are shooting an AR in the common nose to charging handle position or form, with a suppressor on, do you get more gas escaping around the end of the charging handle and squirting you in the face or eyes (even with safety glasses on) ?

I know at least one company makes a "gasbuster" charging handle. It is milled with channels or ports on the underside so that the gases escape through the side and not straight back at you.

Gas buster isn't 100% gas free -
http://www.ar15.com/archive/topic.ht...&f=20&t=330010

I get much less blowback from 223 thru charging handle with 30 cal suppressor than dedicated 223 suppressor.
I did the RTV fix of my charging handle rather than spend the extra for a non-milspec part for my AR.

http://www.ar-15.co/forums/showthread.php?t=10446