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omgwtfbbq
12-05-2011, 7:21 PM
I recently read an article about .300 AAC (7.62X35mm) ammo. After doing a little research I haven't really gotten a good handle on exactly what the pros and cons of the cartridge are.

From what I've read it seems that it was created with the intention of providing supersonic ballistics comparable to 7.62X39mm but with much better subsonic ballistic characteristics for use with suppressors.

My question is, for practical civilian ownership, why should someone invest in a .300 AAC AR upper or say the foretold Kel Tec Su-16 .300 AAC, when there are AK and AR platforms that use 7.62x39mm readily available? 7.62x39 can be loaded for subsonic usage, and even though .300 AAC is not terribly expensive when compared to say commercial .308 ammo, it's certainly not as cost effective as 7.62x39mm.

The only serious advantage I have read about seems to be the ability to use the same BCG, mags and other internals as a standard 5.56mm AR.

In summation, I ask for enlightenment on the pros and cons of this new round. If this subject has already been discussed (I used the search function, but it tends to lead me astray on a regular basis) I would appreciate a link. Thanks in advance.

CRTguns
12-05-2011, 7:51 PM
revised... my bad. SSK- the inventors fo the Whisper are the A-holes. Not AAC. AAc is good stuff. Sorry. Too many letters to keep straight.

Lookup "AAC honey badger" <---want this

tomd1584
12-05-2011, 8:08 PM
The advantage is reliably using a .30 cal bullet out of the AR platform. Like you mentioned, no changing bolts, magazines or training techniques. Not having to relearn a new system has its advantages. All your gear works too.

ETA: www.300blktalk.com is a great source for information about this awesome round.

Tier One Arms
12-05-2011, 9:45 PM
The 300 BLK is becoming more and more popular, I believe at this point it has already surpassed the 6.8. Ammo for it is already cheaper than 6.8 and it will be under $10 a box soon.

Bladewurk
12-05-2011, 10:22 PM
This has always been a nice low presssure quiet round when it was called .300 Whisper(same thing)...

It now has factory support $$$$$$... and all you need is a new barrel to change over.
This has very long barrel life and you get a nice .30 cal midrange rifle that is quiet esp in pistol length or SBR length barrels compared to 5.56,

and ARs in 7.62x39 have always been problem childs due to case taper and bolt face dimensions etc..

omgwtfbbq
12-05-2011, 10:54 PM
Thanks for the information so far guys.

Only only thing I was wondering about if anyone has heard about recoil. From videos I've seen it seems pretty manageable.

Also if one of the chief advantages is better ballistics with shorter barrels, is that alone worth the investment.

joelogic
12-05-2011, 11:14 PM
If you are just shooting paper then who cares? Shoot anything you want.
If you want to shoot a .30cal projectile out of an AR-15 then Bingo.
Recoil is softer than an AK.

Jwind
12-05-2011, 11:20 PM
Hickok45 did a video. Did a quick googling, and I think I saw someone say it actually works better in a shorter barrel? Either way, I'm interested now lol. It seems everybody is running suppressed setups, wonder if that makes a difference or not though.

Sd_2tcj7P4s&feature=g-all

MrPlink
12-06-2011, 1:39 AM
Hickok45 did a video. Did a quick googling, and I think I saw someone say it actually works better in a shorter barrel?

wondering this myself.
Im about to complete another 80% lower and feel like doing something stupid like a 300blk AR pistol :43:

conversely, how about longer barrels? 18 - 20in?

Jwind
12-06-2011, 4:11 AM
wondering this myself.
Im about to complete another 80% lower and feel like doing something stupid like a 300blk AR pistol :43:

conversely, how about longer barrels? 18 - 20in?

Well like hickok said, most people run suppressed. Most barrels I've seen seem to cater to that. Longest barrel I've seen is 16in.

Would be awesome if I could find an 18in, but I'm stillin the early stages of my AR build so the barrel can wait.

Don29palms
12-06-2011, 6:54 AM
I like the 7.62x40 much better. It has higher velocity and is more accurate at longer distances.

joelogic
12-06-2011, 7:45 AM
It has better ballistics in a short barrel when compared to a .223 in a short barrel.
Any round will have a higher velocity in a longer barrel to a point. 18" barrels are available.
40WT is a faster round but is not a saami round.

omgwtfbbq
12-06-2011, 8:25 AM
Well like hickok said, most people run suppressed. Most barrels I've seen seem to cater to that. Longest barrel I've seen is 16in.

Would be awesome if I could find an 18in, but I'm stillin the early stages of my AR build so the barrel can wait.

Noveske offers full .300blk rifles in 18 and 20 inch.

From what I've gathered most people run a suppressed setup because that was one of the major intended advantages of the round. Aside from mimicking or improving on the supersonic ballistics of the 7.62x39, they wanted a round with addition stopping power and better accuracy with subsonic capabilities that could be readily used in suppressed, CQB scenarios. Hense the importance on good ballistics in a short barrel configuration. Supposedly its much more accurate and has more kinetic energy transfer than .45acp suppressed or 9mm suppressed.

Daze
12-06-2011, 10:17 AM
I had read all the reviews, managed to not get too caught up in the hype, but then I shot one recently in an AR class down at Metcalf and I was pretty sold. Very manageable recoil and the one I shot (which had a SI Defense barrel,) shot incredibly accurate. I am considering grabbing a barrel to swap in my 6.8SPC upper. Ammo for that is still a little pricey, but the 300 ammo is more reasonable. I sadly cannot run suppressed, but would if I could.

jingerale
12-06-2011, 2:47 PM
Anyone have opinions on 300 AAC as a hunting round?

I'm trying to figure out what to get for hog hunting. 300 AAC or a 700 SPS in .308. I have no plans of shooting anything over 200 yards. And AR10 is too costly, the mrs. would not go for that.

Iggy
12-06-2011, 3:49 PM
Anyone have opinions on 300 AAC as a hunting round?

I'm trying to figure out what to get for hog hunting. 300 AAC or a 700 SPS in .308. I have no plans of shooting anything over 200 yards. And AR10 is too costly, the mrs. would not go for that.

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2270985&page=1

wash
12-06-2011, 4:03 PM
AR15Performance started making and selling .300AAC barrels a while ago and then dropped them because the supersonic ammo sucked.

If you are going to run a supressor and sub-sonic ammo it is probably a good choice.

If not, skip it.

Lagduf
12-06-2011, 4:23 PM
Suppressed .300BLK PDW type weapon would be cool.

If you lived somewhere where you could get that :)

CRTguns
12-06-2011, 5:58 PM
Calguns user, "Joelogic" used a 300 whisper to "sneak" into a division win in 2011 BARC.

Loads with a 150 gr iirc.

I know a guy that plays with one twisted for the 220 gr bullets to go subsonic- sounds like a rimfire.

I opted for a .338.
300 grain bullet baby! I opted to design my own chamber and had a custom reamer made up.