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Switching to 6.8? #6442155 09/07/16 06:00 PM
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MDMORROW Offline OP
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I’m sure this has been beat to death at this point but I figured I’d ask anyway.

I’ve been killing hogs and coyotes for a couple years now with 300 blackout SBRs, 8.2” Noveske barrels to be exact. While I’ve been effective I just feel that the power isn’t there. I’m shooting a max load with 125 GR SST’s

Looking to learn about 6.8. It seems like the hardcore hog hunters are all just about shooting that round and doing so very effectively.

My normal hunting situation is typically about 150 yards or closer. I’m using suppressors and thermals and want to stay at as short a barrel as possible. I do reload.

I understand a barrel change, plus bolt, plus mag is all that really needs to be changed to convert to 6.8. What else?

Any and all knowledge would be appreciated. Where to source parts, etc.

Last edited by MDMORROW; 09/07/16 06:00 PM.

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Re: Switching to 6.8? [Re: MDMORROW] #6442174 09/07/16 06:09 PM
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Subsonic 300 isn't a deciding factor either. I find it totally worthless for hunting.


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Re: Switching to 6.8? [Re: MDMORROW] #6442239 09/07/16 06:53 PM
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New barrel, bolt, and magazine is all you need. I love my 6.8s

Re: Switching to 6.8? [Re: MDMORROW] #6442243 09/07/16 06:55 PM
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Oh yeah how about load preferences too?

I'm really leaning towards 6.8.

Also, leaning towards another Noveske barrel. Anything else I should consider? I'm a big noveske fan and always trust their stuff.


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Re: Switching to 6.8? [Re: MDMORROW] #6442245 09/07/16 06:58 PM
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Arp , bison, Wilson combat
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Re: Switching to 6.8? [Re: MDMORROW] #6442247 09/07/16 06:59 PM
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Noveske is good to and really not that much more.

Re: Switching to 6.8? [Re: MDMORROW] #6442252 09/07/16 07:03 PM
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IMO this would be about like going from a .308 to a .30-06. You're not going to see great improvement. And I have a 6.8.


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Re: Switching to 6.8? [Re: QuitShootinYoungBucks] #6442327 09/07/16 07:31 PM
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Originally Posted By: QuitShootinYoungBucks
IMO this would be about like going from a .308 to a .30-06. You're not going to see great improvement. And I have a 6.8.


I own rifles in both calibers as well, but have the complete opposite opinion. IMO the difference between the hunting effectiveness of the 6.8 vs .300 BLK is substantial. My 6.8 knocks pigs dead, I have pretty much stopped hunting with the .300 BLK.

All the .300 BLK diehards argue that shot placement is key and if you make a proper shot it will kill a pig dead. This is true. However, this is also true with pretty much every other center fire rifle caliber which, to me, makes this a pointless argument. The advantage of the 6.8 is that it gives you more room for error. So, less than ideal (i.e. running piggies) shots are more lethal.

You can pop the top off of a beer with a screwdriver, but I'm still reaching for the bottle opener every time if I have one handy. Just because the .300 BLK can do the job doesn't mean it's the best option.

Go with a 12.5" ARP 6.8 barrel and get ready to smile.


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Re: Switching to 6.8? [Re: MDMORROW] #6442344 09/07/16 07:43 PM
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Dr. Morrow, do you know how fast my 125 SST runs in your 8.5" barrel? I'd be curious to know. As physics would show, the shorter the barrel, the lower the velocity. The lower the velocity, the lower the bullet energy. I have been hunting with the 115 Bergers and 125 SST/BT for several years in a 16" bolt gun. My speeds are 120 fps faster than a 16" AR barrel, since it's a bolt gun. I've had really good results with the 125's in the bolt gun so far. In my AR-15 with FLIR thermal scope, I run the 125 BT ammo, and have taken a pig and many night time critters. You should gain/lose about 20-25 fps per inch of barrel. But when you get to 10" and 8.5", you may lose more fps per inch, since it's so short. The hard part is finding a powerful round and keeping the barrel short, like you want. The 6.8 does hold more powder, which will increase speeds. But I don't know how much you will gain over the blk out by keeping it in a short barrel, also.


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Re: Switching to 6.8? [Re: MDMORROW] #6442374 09/07/16 08:03 PM
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Be different and get the Six5

ARP has a smoking deal on a barrel for 150 bucks

Otherwise the standard ole 6.8 will do...

You just missed his Labor Day sale on the Triad barrels (modified chamber) .

Plenty of people like the caliber and if you're going with Noveske what's not to like ?


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Re: Switching to 6.8? [Re: MDMORROW] #6442454 09/07/16 08:47 PM
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I have heard from to many people the blackout lacks thump in real life.

Re: Switching to 6.8? [Re: Brother in-law] #6442515 09/07/16 09:10 PM
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Originally Posted By: Brother in-law
I have heard from to many people the blackout lacks thump in real life.


Strange...I've killed about 5 or 6 hogs with mine and none have gone more than two steps. Also killed several yotes as well with the same results. All I use is a 8.5" or 10.5" barrel.

Killed a huge hog that probably went 275 lbs and he dropped like a rock with Chad's 125 SST's with one shot at 150 yards.

I don't get the 300 BO hate.

Re: Switching to 6.8? [Re: MDMORROW] #6442639 09/07/16 10:24 PM
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Believe me I love my blackouts. I've got a bunch of money in them too with all premium parts and what not but I just don't see the pigs drop like I did when I was shooting a 308. My load is 17.5 gr of 4227 over a 125 sst. I can't remember my velocity but I've got it down in my load book. I kill pigs but I feel like I always have to put another bullet or two in them and consequently lose other pigs because I'm focusing on dropping the first. Now coyotes drop like rocks but they're a lot more fragile critters then pigs are.

With the 6.8, would there be much gained by going from 10.5" to 12.5"?

I'm looking hard at noveske with a matched bolt.


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Re: Switching to 6.8? [Re: MDMORROW] #6442642 09/07/16 10:25 PM
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How is the sound of a suppressed 6.8 vs a hot super sonic 300 blackout? I have an omega and a saker.


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Re: Switching to 6.8? [Re: MDMORROW] #6442647 09/07/16 10:27 PM
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Love my 6.8. 12" barrel pushes 110gr bullets at around 2350 fps, 90gr bullets around 2600 fps. Still have yet to take a hog with it, but my 6.8 is my go-to rifle over my 5.56.

Re: Switching to 6.8? [Re: MDMORROW] #6443106 09/08/16 03:14 AM
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Originally Posted By: MDMORROW
How is the sound of a suppressed 6.8 vs a hot super sonic 300 blackout? I have an omega and a saker.


My 16" 6.8 wears an Omega. It's great.


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Re: Switching to 6.8? [Re: MDMORROW] #6443182 09/08/16 04:20 AM
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I've got a 16" ARP barrel and I love it. I use 95gr TTSX's over 29gr of 1200R. Off the top of my head I think they go about 2780 fps. It has been bad medicine for a lot of hogs.

Re: Switching to 6.8? [Re: TTUhunter4] #6443193 09/08/16 05:00 AM
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Originally Posted By: TTUhunter4
Originally Posted By: QuitShootinYoungBucks
IMO this would be about like going from a .308 to a .30-06. You're not going to see great improvement. And I have a 6.8.

Go with a 12.5" ARP 6.8 barrel and get ready to smile.


This. I have this setup suppressed and shoot lights out with my 95 gr Barnes reloads. The factory Federal MSRs shoot sub-MOA too. From a short barrel. At supersonic speeds the 6.8 thumps the 300 BO all day long.





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Re: Switching to 6.8? [Re: MDMORROW] #6443196 09/08/16 05:17 AM
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Visit the 68forums.com and you find all the info you need


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Re: Switching to 6.8? [Re: MDMORROW] #6443197 09/08/16 05:20 AM
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btw. My 6.8 is my go to rig.
16 in ARP bbl
I run SSA factory 110 accubonds for now. Took my last buck at 180 yds and fell in his tracks


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Re: Switching to 6.8? [Re: MDMORROW] #6443346 09/08/16 01:07 PM
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Originally Posted By: MDMORROW
My load is 17.5 gr of 4227 over a 125 sst. I can't remember my velocity but I've got it down in my load book.


For a short barrel, 4227 would not be the powder I would recommend to get top speeds. It's an extruded powder, where H110 is a ball powder. In a standard 16" barrel, 4227 is about 150 fps slower than H110. In a short barrel, there will be even more difference. If you switched to H110, you will see an increase in velocity, and will give you more energy.


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Re: Switching to 6.8? [Re: MDMORROW] #6443355 09/08/16 01:14 PM
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I would recommend a complete Wilson Combat upper. up


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Re: Switching to 6.8? [Re: DocHorton] #6443358 09/08/16 01:18 PM
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Sure, the 6.8 has more energy, because it's a bigger cartridge. It holds 36% more powder, and shoots about the same weight bullet (90-110 grains) about 160 fps faster, if both rounds were fired out of a 16" barrel. The 6.8 has a very narrow and limited bullet use. The blk out is one of the most versatile rounds for cycling subs, and supersonic bullet choices. The 6.8 can not come close to that.

Originally Posted By: DocHorton
I don't get the 300 BO hate.


I don't either. It's a great cartridge and performs flawlessly for me in everything I need it to do. A 30 caliber bullet in the blk out has dropped almost everything I have shot in it's tracks. I have shot 270 and 308 for years, and if the animal didn't know what caliber it was shot with, the performance has been on par with both of those. (With supersonic ammo, not subs)


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Re: Switching to 6.8? [Re: MDMORROW] #6443433 09/08/16 02:33 PM
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sounds good Chad. I think instead of making the switch now I'm going to spend some time on load development. When I starting using the 4227 it was only because I couldn't locate any 110.

I have a bunch of 125 SSTs left but I'm going to pick up something in a 110 grain.

Anybody used the 110 Hornady SP? I know that barnes is the one everyone seems to like but I'd like to know other options as well.


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Re: Switching to 6.8? [Re: MDMORROW] #6443434 09/08/16 02:34 PM
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I do have 110 on hand now. Got a couple of pounds the other day.


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