6.8 SPC for deer hunting?

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cwink
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6.8 SPC for deer hunting?

Postby cwink » Wed Nov 22, 2017 9:51 pm

Here is a report on the 6.8 SPC for a hunting round. I finally got a chance to get back into the woods after a couple year drought. When my son opted not to go, I snuck his Thompson Center Contender with 6.8 SPC barrel and Dixie Precision Suppressor to the woods. About 5:10 a good sized doe stepped into the gasline at about 160 - 170 yards out. I lined up the little 2x7x33 Redfield and pulled the trigger. She tucked tail and ran and I was pretty sure I heard her crash, but by her reaction, I thought I might have hit her a little far back. I stepped out of the blind and walked to the truck and waited about 30 minutes. I spent about 5 minutes looking for blood in the gas line before I stepped into the woods to see if I could find her. It didn't take long to find the big white belly. She had run about 30 yards before crashing. The shot hit her right behind the front shoulder and had a good exit hole just in front of the other shoulder (she was quartering away from me at the time of the shot). I am very pleased with the 6.8 as a hunting round. I was shooting the .27 caliber Hornady 120 grain SST. For shots out to about 200 yards, this is a great little round for kids and adults! :)
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Re: 6.8 SPC for deer hunting?

Postby mshunter77 » Thu Nov 23, 2017 11:00 am

Looks like a sweet little setup. Guessing recoil is minimal.
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Re: 6.8 SPC for deer hunting?

Postby cwink » Thu Nov 23, 2017 6:04 pm

Yes recoil is actually less than a .243 but your sending a larger/heavier bullet downrange, Here is a couple of comparisons. Most experts agree, once you get over 15 lbs or recoil, it starts to effect your accuracy. My latest acquisition is a Ruger M77 Hawkeye Compact in 6.8 Rem which is pretty rare. It was in the truck, but I didn't have time to sight it in before heading to the stand, so I took the TC 6.8 instead.

Cartridge Rifle Weight Recoil
6.8mm SPC (115 at 2625) 7.5 8.0
.243 Win. (100 at 2960) 7.5 8.8
7mm-08 (120 at 3000) 7.5 12.1
7mm-08 (140 at 2860) 8.0 12.6
.308 Win. (150 at 2800) 7.5 15.8
.308 Win. (165 at 2700) 7.5 18.1
.308 Win. (180 at 2610) 8.0 17.5
.270 Win. (130 at 3140) 8.0 16.5
.270 Win. (140 at 3000) 8.0 17.1
.270 Win. (150 at 2900) 8.0 17.0
.30-06 Spfd. (150 at 2910) 8.0 17.6
.30-06 Spfd. (165 at 2900) 8.0 20.1
.30-06 Spfd. (180 at 2700) 8.0 20.3

Here is some interesting info on recoil

For every action there is an equal and opposite reaction; that is one of the physical laws of our universe. This means that the momentum of a rifle's reaction will exactly equal the momentum of the bullet and powder gasses ejected from the barrel. In the shooting sports we call that reaction recoil or "kick." It can be measured or computed empirically and has been for this recoil table.

Do not forget that rifle weight is a crucial factor in the recoil equation, inversely proportional to recoil. Increase the gun weight by, say, 25% and the recoil goes down by 25%. In the real world, firearms chambered for less powerful cartridges are typically built lighter than firearms chambered for more powerful cartridges. Violate this principle by, for example, chambering a lightweight, short action rifle for a powerful Magnum cartridge like the .300 WSM and the result will be a dramatic increase in kick. Just because it can be done does not mean it makes sense, despite what you might read in advertising copy. Choose a rifle weight appropriate for the loads you intend to shoot.

However, perceived recoil, what the shooter feels, is a highly subjective matter. In addition to gun weight, it is influenced by many factors. One of the most important of these is the fit and shape of the rifle stock. A good recoil pad can help soften the blow to the shooter's shoulder. Gas-operated semi-automatic actions reduce apparent recoil by spreading it over a longer period of time. These sorts of things cannot be accounted for in a recoil table. Also, please understand that there are dozens of loads for any given bullet weight in any cartridge that will produce the same velocity, but a different amount of recoil. So the figures in any recoil table should be taken as approximate. Never-the-less, the table below should give a reasonably accurate comparison of the recoil of most popular rifle cartridges.

It is worth remembering that the majority of authorities agree that recoil of over twenty foot pounds will cause most shooters to develop a serous flinch, which is ruinous to bullet placement (the prime component of killing power). Fifteen foot pounds is probably about the maximum recoil energy most shooters feel reasonably comfortable with, particularly at the shooting range, where most serious marksmanship practice occurs.

While recoil energy determines how hard the blow to the shoulder feels, recoil velocity determines how abrupt the blow to the shoulder feels. My subjective impression is that, with a well designed stock, recoil velocity above about 10 fps begins to feel like a sharp rap on the shoulder rather than an abrupt push.

In 1909, the British Textbook of Small Arms stated that 15 ft. lbs. of free recoil energy was the maximum allowable for a military service rifle. (The standard British .303 Lee-Enfield infantry rifle was below that figure, as are most service rifles to this day. This should tell you something.) The 1929 edition of the same textbook stated, in addition, that recoil velocity should not exceed 15 fps; above that velocity a gun-headache was very likely to occur. These figures remain practical maximums for the modern hunter.

Above this level recoil becomes increasingly intrusive. In addition, the effects of recoil are cumulative. The longer you shoot, and the harder the rifle kicks, the more likely you are to flinch. These are good things to remember when comparing rifle cartridges.
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Re: 6.8 SPC for deer hunting?

Postby mshunter77 » Thu Nov 23, 2017 8:22 pm

Very interesting. I have been using 30.06 since I was a kid until I picked up a 308 savage aXis for really cheap last year. I had been wanting to go to a lighter recoil gun. I sold it after the season as I found it too light and decided I wanted something with a heavier barrel, better stock, and threaded. Right now I am leaning towards the savage hog hunter in 308. After seeing that chart I may have to look into the 7mm08 a little more.
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Re: 6.8 SPC for deer hunting?

Postby stang67 » Thu Nov 23, 2017 10:54 pm

I think stock fit probably contributes a +/- factor of 50% to those numbers. It is that important.
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Re: 6.8 SPC for deer hunting?

Postby cwink » Fri Nov 24, 2017 4:07 pm

mshunter77 wrote:Very interesting. I have been using 30.06 since I was a kid until I picked up a 308 savage aXis for really cheap last year. I had been wanting to go to a lighter recoil gun. I sold it after the season as I found it too light and decided I wanted something with a heavier barrel, better stock, and threaded. Right now I am leaning towards the savage hog hunter in 308. After seeing that chart I may have to look into the 7mm08 a little more.



Very little difference in the .308 and 7mm-08. They are both the same case, the only difference the caliber of the bullet. The .308 launches a 30 caliber bullet, while the 7mm-08 is 28 Caliber. The popular 270 is only a 27 caliber bullet which equates to 6.8 mm.

Too many times we get caught up in caliber debates and people don't really look at the ballistics. There is no animal on earth that is going to be able to tell the difference between a 140 grain 7mm08 bullet at 2,860 FPS and a 150 grain .308 Caliber bullet at 2,800 FPS

7mm-08 (140 at 2860) 8.0 12.6
.308 Win. (150 at 2800) 7.5 15.8


People always say the .243 is to light for deer, and that the 7mm-08 is the perfect youth gun. Truth is a proper fitting stock and light recoiling round is much more important than the size of the bullet coming out of the gun.
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Re: 6.8 SPC for deer hunting?

Postby Smoke68 » Tue Nov 28, 2017 10:10 am

Cwink, where does Remmington's Managed Recoil 7mm-08 round fit into your above chart in terms of recoil?
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Re: 6.8 SPC for deer hunting?

Postby cwink » Tue Nov 28, 2017 1:49 pm

Smoke68 wrote:Cwink, where does Remmington's Managed Recoil 7mm-08 round fit into your above chart in terms of recoil?


I have never shot them personally, but they are supposed to be at or just below .243
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Re: 6.8 SPC for deer hunting?

Postby Wildfowler » Tue Nov 28, 2017 4:59 pm

I really like the 6.8.

I don’t have one personally but my boss does in AR and it’s bad to the bone. I’ve got him shooting 120 SST’s also. That bullet is purpose built for the 6.8 as a “big game” and it does a great job.

I have a 30 caliber AR wildcat based off the 6.8 case and it’s also bad to the bone. I call it the super blackout. I’m shooting a 125 Speer TNT varmint bullet at 2600 ft./sec.
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Re: 6.8 SPC for deer hunting?

Postby stang67 » Wed Nov 29, 2017 8:41 pm

cwink wrote:7mm-08 (140 at 2860) 8.0 12.6
.308 Win. (150 at 2800) 7.5 15.8

As you state, the recoil on the 308 is 25% higher, so the energy of that projectile is 25% greater, or thereabouts. That's NOT insignificant. For some situations, that is a big deal. Does it make a difference on a whitetail? Well, that's debateable.

I'm a 7-08 fanatic, and I use 120gr bullets. I go into the woods understanding my margin for error is smaller than if I were using some "heavier weight" long action and 30-cal rounds. It's just a fact.
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Re: 6.8 SPC for deer hunting?

Postby cwink » Fri Dec 01, 2017 10:58 pm

stang67 wrote:
cwink wrote:7mm-08 (140 at 2860) 8.0 12.6
.308 Win. (150 at 2800) 7.5 15.8

As you state, the recoil on the 308 is 25% higher, so the energy of that projectile is 25% greater, or thereabouts. That's NOT insignificant. For some situations, that is a big deal. Does it make a difference on a whitetail? Well, that's debateable.

I'm a 7-08 fanatic, and I use 120gr bullets. I go into the woods understanding my margin for error is smaller than if I were using some "heavier weight" long action and 30-cal rounds. It's just a fact.


Agree, to me it is finess over power. I am a much better shot with a 120 grain 7mm08 than a 150 grain 30 06. I can slip a 7mm08 into a 6 inch circle at 200 yards much easier than a 30 06
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Re: 6.8 SPC for deer hunting?

Postby ufgators68 » Mon Dec 04, 2017 7:30 am

I built a rifle, for my wife, and I debated between the 6.8 SPC and the 6.5 Grendel for a few weeks. Both looked great but the 6.5 won out on ammo options, at the time, and a Shilen Match barrel, with matching Alexander Arms bolt, being on sale. :lol:

After finishing it, I liked it so much that I started using it instead of my M&P 10.

It has had a few things removed since this pic was taken. Bipod and vertical grip get removed for hunting. Weighs just over 9 pounds, loaded.
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Re: 6.8 SPC for deer hunting?

Postby stang67 » Mon Dec 04, 2017 7:14 pm

Grendel is much mo betta.

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