View Full Version : Considering a 6.8 upper for my 5.56

November 3, 2012, 12:37 PM
I'm not saying my 5.56 isn't enough for hog hunting....but. I'm strongly considering a 6.8 upper for my M&P15 VTAC, as opposed to going with a bolt action. Anyone done this? If so, share you pro's and con's.

November 3, 2012, 01:29 PM

November 3, 2012, 01:56 PM
Thank you sir

November 3, 2012, 06:03 PM
300 AAC Blackout would make a better 0 - 300 yard gun.

November 4, 2012, 08:36 PM
I built a complete 6.8 rifle. The upper was from PSA. Best price for one. I waited 6 weeks to get one. Second challenge is getting a complete BCG. I went with a couple of different options. I bought a complete 6.8 BCG from M&A until a Daniel Defense became available.

68 Forums will answer any question you have.

November 4, 2012, 10:05 PM
6.5 GRENDEL!!!!!!!!!!!!!!!:eek:

November 5, 2012, 04:39 AM
I use a colt ar in 5.56 for work. shot a buddy's 6.8 and the differance is night and day. To me the 6.8 shot softer and it held a 1" 100 yrd group with ease. I can't even come close to that with the colt.

November 5, 2012, 08:50 PM
I was checking out Bison Armory uppers - their barrels have a 1:7 twist. So without doing reloads of their 200 grain bullets, does anyone else make a round heavy enough applicable?

November 5, 2012, 10:38 PM
I'm not fully up to speed with the 300 AAC Blackout yet? Is ammo readily available?

November 6, 2012, 12:31 AM
^Ammo is mostly available online for now, but few LGS have them in stock.

If you go with 300BLK you will have better interchangeability with AR parts than the 6.8 which is a big advantage IMO. If you just want the better ballistics, then go with 6.8

November 6, 2012, 01:12 AM
The 6.8 out performs the 300 BLK at all distances

I went with the 6.8

Great round for Piggies

Look at Hornady SST 120

November 6, 2012, 07:36 AM
It looks like Magpul will have 6.8mm magazines available in the near future?


November 6, 2012, 04:06 PM
I found out that all of my LGS's carry 300 Blackout rounds, and no one carries 6.8mm. Same mags...hmmm. Now I'm considering the Blackout.

November 6, 2012, 08:43 PM
The 6.8 is a buy on the internet, or a reload at this point

I reload.

It uses the lighter 270 rounds. 80 to 130 grain

There does seem to be a decent growth of the 6.8, and there are some ammo mnaufacturers coming out with cheap ammo, so what you see today isnt what I believe that you will see in the future

To me, the performance is the key.

The 300 BLK seems to act more like a 7.62x39, but will do the job

November 6, 2012, 11:45 PM
I think either will be good for my purpose here. The 6.8 definitely seems to have better ballistics. Locally I could pick up a 300 blackout Noveske or AAC upper... as well as the ammo. Decisions, decisions?

November 7, 2012, 12:25 AM
6.8 will do you fine.

November 7, 2012, 09:17 AM
Good to Go Ammo in Texas has a great 6.8 bullet in SSA brass for around .75 apiece for plinking.

The hunting round of 120 grain SST from Hornady is a tremendouse stopper at around 1.10 per round

If you dont wish to reload, there are plenty of people that would buy your once fired brass on 6.8 at .40 cents apiece.
(me included)

They will pay shipping

So, you could end up shooting the better 6.8 at a net price of .35 for plinking ammo and .60 for hunting ammo

The 300 BLK is nice, but it doesnt come close enough to the 6.8 IMHO

For shots to 200 yards both would be effective. (the 300BLK drops away much faster past 150 yards than the 6.8)

I do think the 300blk beats the 6.8 if you run suppressed, but there are vendors like Bison Armory that are out with 6.8 subsonic uppers

This is a good, fair dialog on the topic, both pro and con:


Good luck on your choices

November 7, 2012, 08:10 PM
Are you hunting with your 6.8? And what's the twist of your barrel?

November 7, 2012, 10:11 PM
For me, the biggest issue with the 300 or the 6.8 is the ammo cost. The ammo is out there. I think all three will do well for a while. The 300 is alot like the 7/62 x 39, but I would say that round is superb if someone made an AK worth a damn! AR's won't feed it, so now we have 300 Blackout.

If you were going to shoot pigs silenced, the 300 would really show it came to play!

November 7, 2012, 10:15 PM
1/11 twist

November 7, 2012, 10:21 PM
I bought the rifle to hunt Texas pigs with about 4 weeks go after seeing all the kills on 6.8 forum.

Havent been out to hunt with it. But love shooting it so far.

I have a 8mm mauser that I have used for a few years, which knocks the pigs down.

I just wanted something lighter. In an AR format.

Call Ben at Bison Armory. He will set you up.

He built mine and 2 of my friends

November 8, 2012, 06:41 AM
Is it possible to post a pic(s) of your Bison upper?

I spent some time on there site last evening - definitely in my price range. I've found a few Noveske's, but all in the $1,000-$1,500 range.

November 8, 2012, 04:04 PM
PM sent

November 8, 2012, 05:54 PM
Appreciate it

November 9, 2012, 08:03 PM
300 BLK UMC is $10.36 per box of 20. That is cheaper than any 30-30, and 6.8 is 40% more expensive.

This is 300 BLK at 300 yards - 20 inches of penetration and full expansion from a 9 inch barrel!


So at 300 yards, you can expect it to make a 50 caliber hole completely through a deer even when using a 9 inch barrel.

Does 6.8 have longer range? Sure - especially if you use the 120 grain SST bullet. But it seems most 6.8 people love the Barnes 85 TSX, and that is 685 ft-lbs at 300 yards as loaded by Silver State Armory. Remington 125 grain 300 BLK ammunition is 690 ft-lbs at 300 yards, and the Barnes 300 BLK 110 grain in the photo above is 615 ft-lbs at 300. Just sayin' - will the deer feel the difference?

And 6.8 uses about 45% more powder - which ends up as noise/recoil/blast, more expensive reloading from the powder, and the brass is 2-3x the price. Also 30 caliber bullets are so common that they are actually cheaper than 22 caliber bullets in some cases (pulled bullets, for example).

November 9, 2012, 08:43 PM
Tomorrow I will have the opportunity to shoot the 300. A buddy of mine just picked up an AAC upper (for his M&P lower), and we're hitting an outdoor range (200 yarder).

I saw at my LGS today UMC 115 grain for 12.00... still pretty reasonable.

November 10, 2012, 09:13 PM
Here's a much better representation of hunting bullets in the common AR calibers from a 16" barrel. The 30-30 and 223 are from a 20" barrel.


300bo makes a fun subgun round for IPSC or plinking, but when you need to kill critters, it's barely above the 223.

November 10, 2012, 11:11 PM

November 10, 2012, 11:48 PM

November 12, 2012, 02:56 AM
I love my 6.8. More accurate than my 5.56 or 300 BLK. Brass is expensive for reloading. $60/100 SSA.
But with 300BLK you can choose anywhere from 110gr to 240gr bullet and you can form your own brass from 5.56 and use the same mags and BCG from your 5.56

November 12, 2012, 02:52 PM
I am absolutely not trying to talk you out of one, because they look great to me, but...you could just buy a couple of boxes of Barnes 55gr TSX and probably get the same terminal performance. Either way, have fun.

November 12, 2012, 09:35 PM
It would be cheaper and easier for me to do a 300 blackout set-up (same mags, BCG, cheaper ammo, and more plentiful in my area). At this point in time I do not do reloads.

But, the 6.8 ballistics might trump everything else?

November 24, 2012, 10:05 AM
I've decided on a Bison Armory 6.8 upper. Now, it's whether to go with the 16" recon or 16" recon subsonic? Pro's or con's on either?

I'm waiting for my activation on the 6.8 forum to pick their brians as well.

November 24, 2012, 10:22 AM
I was checking out Bison Armory uppers - their barrels have a 1:7 twist. So without doing reloads of their 200 grain bullets, does anyone else make a round heavy enough applicable?

Bison Armory developed the 1:7 twist barrel to shoot 200gr bullets subsonic. Unless you plan on using a supressor with a 6.8 it doesn't offer any other real advantage over a 1:11 twist.

November 24, 2012, 10:28 AM
Looks like the 1:11 is the winner then. Maybe in the future I will consider supressed, but not at this point in time.

November 24, 2012, 10:31 AM
Don't discount Bison Armory because of the 1:7 twist. They also have a great lineup of 1:11 twist uppers and complete guns. They are dedicated to the 6.8 and probably more knowledgable about it then any other manufacturer.

November 24, 2012, 10:41 AM
In what way did I discount Bison? That's who I'm buying my upper from.

November 24, 2012, 04:20 PM
Great call on getting the Bison!

November 24, 2012, 04:38 PM
One of the benefits of the AR platform is parts availability and interchangeability. For many that is the appeal of the .300 BO. Literally, all you need is a a different barrel and different ammo.

To say the 6.8 or the .300 has better ballistics than the other ignores many aspects of ballistics. Either is suitalbe for the intended purpose of hog hunting. When you factor in the probable distances, energy, blood trail, etc. you are probably at a wash at best, but in my experience, I would go larger diameter over more speed inside of 300 yards.

When you look at ammo cost and bullet selection, then of course, the 300 BO holds an edge.

Skip all that and just get a .450 BM. :D

November 24, 2012, 05:49 PM
6.8 benefits from an 18 or 20" barrel a lot.

November 24, 2012, 06:36 PM
For primarily a hog gun I wouldn't go for a 20" barrel. I'd go 18" because it splits the difference. If you are really only going to use it for hogs and not much else then go 16". Though IMO if you are buying a 6.8 and don't deer hunt with it every now and again it's a waste.

November 24, 2012, 07:51 PM
Literally, all you need is a a different barrel and different ammo.

To swap a barrel instead of an entire upper every time I hunt is out of the question.

To say the 6.8 or the .300 has better ballistics than the other ignores many aspects of ballistics.

I'm basing this on success that local hunters are having for pig and deer hunting. I have not heard success stories yet on the 300BLK unless going subsonic and supressed.

When you look at ammo cost and bullet selection, then of course, the 300 BO holds an edge.

The difference in price (which isn't much) in no biggy, it's not my plinking round.

November 24, 2012, 07:52 PM
Though IMO if you are buying a 6.8 and don't deer hunt with it every now and again it's a waste.

Yes, there will be deer hunts as well. Primarily hogs though.. Not sure if I should go with the 16" or 18" barrel?

November 24, 2012, 08:18 PM
Good choice on the Bison 1:11. If you reload, AA2200 is the powder of choice for 95-120gr bullets, Nosler 110gr Accubonds and Barnes 95gr TTSX are the preferred hunting bullets. I prefer H4198 for the 85-90gr bullets, but some get better accuracy with Re7.

November 25, 2012, 03:27 AM
When it comes to the 6.8 you can't go wrong with either Bison or ARP.

November 25, 2012, 07:03 PM
The 16 inch barrel will do fine, and is what most people choose at 6.8 forums

November 25, 2012, 07:28 PM
Cool. I'm a couple of weeks away of placing my order. I emailed Ben over the weekend trying to find out the turnaround time?

Still awaiting profile activation from the 6.8 forum.

November 28, 2012, 11:33 PM
Well I'm finding Bison Armory's customer service is not too good. Not returning calls or emails? Whereas AR Precision has been excellent. Makes me wonder if ARP gets my business now?

November 29, 2012, 07:15 AM
Maybe I spoke too soon? I received an email response from Bison this morning.