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Old 11-15-2016, 09:56 AM   #1 (permalink)
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Anyone hunting whitetail with 6.8 SPC?

Thinking about a semi-auto, shorter rifle for deer hunting and the 6.8 SPC round in an AR platform came to mind.

Anyone running anything like this?
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Old 11-15-2016, 10:27 AM   #2 (permalink)
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CJesse7's nephew shot a nice buck with one this season. I'm sure he'll chime in if he reads the thread.

I'm starting to gather parts for a 6.5 Grendel AR build for deer and target

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Old 11-15-2016, 10:27 AM   #3 (permalink)
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I am and have for the second year in a row. This is my thought process on it.

I wanted to keep the AR-15 chassis, run it in SBR barrel length, use a suppressor, use off the shelf hunting ammo and be able to reach out past 100 yards.

7.62x39 was high on my list. I used it the year before my transition but past 100 yards it really starts to drop like a brick. I missed a deer that year because it fell too fast @120 yards.

I thought about .300blk but that round even at supersonic levels has less energy than 7.62x39mm and drops even faster.

So the choice was between 6.5 Grendel and the 6.8 Spc.

The Grendel is a great round but it really shines out of an 18" barrel and more intended for long distance shots. So if i wanted to hunt past 200 yards, 6.5 grendel wouldve been my choice. Does not perform well in an SBR application and the round tends to be a little light.

The 6.8 SPC is designed to work in an SBR application. The Energy loss between 16" and 12.5" barrel is minimal. Also you can run up to 110 grn rounds off the shelf.

So i chose 6.8 spc.

Few things ive run into running it:

In a 12.5" barrel, suppressed, with a standard gas block it is finicky on the ammo it likes. 110 grn SMK remington match runs perfect and so does Hornady 110 grn SST. Federal 95 grn SP runs ok but it tends to over gas and unlock super fast causing a fail to eject. May be because of ejector springs or case dimensions but i doubt it.

I had horrible results with hornady 110 grn SST on white tail. Its super accurate and is like a lazer through the deer but it wouldnt expand. Ive had great results with SST in other calibers so i dont know what the issue is. I switched to 95 grn Federal SP and it opens up like a flower and leaves a huge hole.

Hope this helps.

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Old 11-15-2016, 12:45 PM   #4 (permalink)
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Thanks.

At most, I might stretch to 350 yards. The 6.8 SPC round seems to be relatively flat over that distance even out of a shorter barrel. I'm thinking 17" barrel with no suppressor. Although I like hunting with a suppressor, I'm looking for more maneuverability in tight spaces.

@IEATRKS84 did you buy or build?

The Ambush (Daniel Defense) 6.8 looks pretty good for an off-the-shelf model.
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Old 11-15-2016, 03:05 PM   #5 (permalink)
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Let me know how a 6.8 at 350 yds works out for you

I have a 12oz task force hammer you can use to install some 3 1/2" deck screws also. It should get the job done.
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Old 11-15-2016, 03:23 PM   #6 (permalink)
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When comparing equivalent slug sizes the 6.8 SPC is fundamentally nothing much more than a 12mm shorter 7x57 round ballistically, given the number of deer sized critters taken with the 7x57 why would it be an issue with a shorter round?

My point of reference is a 120 gr slug not the usual 85gr

6.8 SPC
120 gr sst 2,460 ft/s (750 m/s) 1,612 ft·lbf (2,186 J)

7x57
Sierra ProHunter 120 3107 fps 2573 ft.lbf

As another point my "go to" w black powder

300gr Lead PB 1,597 ft/s (487 m/s) 1,699 ft·lbf (2,304 J)
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Old 11-15-2016, 04:17 PM   #7 (permalink)
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Thanks.

At most, I might stretch to 350 yards. The 6.8 SPC round seems to be relatively flat over that distance even out of a shorter barrel. I'm thinking 17" barrel with no suppressor. Although I like hunting with a suppressor, I'm looking for more maneuverability in tight spaces.

@IEATRKS84 did you buy or build?

The Ambush (Daniel Defense) 6.8 looks pretty good for an off-the-shelf model.
I built mine on matched Aero Precision receivers with YHM components. Thing out shoots me as I'm not much of a distance shooter.
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Old 11-15-2016, 04:24 PM   #8 (permalink)
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It will work, it's fundamentally no different than using a .270 at 600 yards, which is to say possible but no chip shot. All that matters is the bullet and its velocity when it hit the animal.

In long range hunting, max range is determined by the speed where the bullet drops below its recommended impact velocity for expansion. For a lot of bullets this is around 1,800 fps. Use a ballistic calculator and the distance where you stay above that threshold is your max range.

This is assuming that you're accurate enough to do your part, including using a range finder, dialing the drop, reading the wind, and plenty of practice. It is not the same as a .270 at 350 yards, where you can just "hold it on the spine".
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Old 11-15-2016, 04:28 PM   #9 (permalink)
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I am sure you can shoot that far but I would question the effectiveness of it at that distance. I hope you hunt in the wide ass open. I doubt you will get a pass through and a <100 grain bullet is not gonna have a lot of knock down power at 300+. You are gonna end up really good at trailing deer or you will end up losing a bunch. Not sure what the deal is with the 6.8. Get a 18" 700 in 308. At least you can get a heavy bullet that will carry energy.
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Old 11-15-2016, 04:33 PM   #10 (permalink)
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I am sure you can shoot that far but I would question the effectiveness of it at that distance. I hope you hunt in the wide ass open. I doubt you will get a pass through and a <100 grain bullet is not gonna have a lot of knock down power at 300+. You are gonna end up really good at trailing deer or you will end up losing a bunch. Not sure what the deal is with the 6.8. Get a 18" 700 in 308. At least you can get a heavy bullet that will carry energy.
The point is building off dirt cheap AR-15 chassis components. Also an AR is much more ergonomic than a 700. Weight is a big issue as well.
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Old 11-16-2016, 04:15 AM   #11 (permalink)
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6.8 is a great deer round.. Lots of available ammo.. you can actually get 90 grain federal gold dot for fairly cheap and its going about 2800 fps. It'll knock a deer down no problem

I've killed about 15 deer with the 6.8 and about 20 coyotes
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Old 11-16-2016, 05:30 AM   #12 (permalink)
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It will work, it's fundamentally no different than using a .270 at 600 yards, which is to say possible but no chip shot. All that matters is the bullet and its velocity when it hit the animal.

In long range hunting, max range is determined by the speed where the bullet drops below its recommended impact velocity for expansion. For a lot of bullets this is around 1,800 fps. Use a ballistic calculator and the distance where you stay above that threshold is your max range.

This is assuming that you're accurate enough to do your part, including using a range finder, dialing the drop, reading the wind, and plenty of practice. It is not the same as a .270 at 350 yards, where you can just "hold it on the spine".
I'm a pretty fair shooter. I've been reading wind since I was about 8 years old (I'm now 52). 350 yards is the absolute maximum. I believe in actually shooting the gun in the location where I'll be hunting so I know not only the bullet drop but the rise and fall of the land as well.

My 350 yard shot would look like this:



Pretty wide open.
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Old 11-16-2016, 06:06 AM   #13 (permalink)
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I'm a pretty fair shooter. I've been reading wind since I was about 8 years old (I'm now 52). 350 yards is the absolute maximum. I believe in actually shooting the gun in the location where I'll be hunting so I know not only the bullet drop but the rise and fall of the land as well.

My 350 yard shot would look like this:



Pretty wide open.
thats very doable with a 6.8. Just get some good dope data
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Old 11-16-2016, 07:20 AM   #14 (permalink)
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I built mine on matched Aero Precision receivers with YHM components. Thing out shoots me as I'm not much of a distance shooter.
What barrel are you running?
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Old 11-16-2016, 07:27 AM   #15 (permalink)
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YHM 1:10 twist chrome lined barrel i had cut and crowned locally to 12.5"
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Old 11-16-2016, 09:47 AM   #16 (permalink)
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I have dumped a doe pronghorn and 2 cow elk with my 6.8. I am running a 18 inch barrel with handloads hornady 120 SST. The antelope and one of the cow elk were about 100 yards. the other cow elk was at my limit of 300 yards. all went between 20 and 50 yards before dumping.




EXit wound.



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Old 11-16-2016, 04:23 PM   #17 (permalink)
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Any of yall shooting the 6.8 spc through a silencer?
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Old 11-17-2016, 05:16 AM   #18 (permalink)
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Any of yall shooting the 6.8 spc through a silencer?
Yes.
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Old 11-17-2016, 05:40 AM   #19 (permalink)
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Any of yall shooting the 6.8 spc through a silencer?
yes

SAS 7.62 stainless TOMB
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