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#5690514 - 04/08/15 03:17 PM 7mm-08 in AR-10 Mags
Varget 7-08 Offline
Extreme Tracker

Registered: 04/04/10
Posts: 4968
Loc: SA / Helotes, TX
Since the OAL is limited because of the mag, is it worth loading 7-08 in an AR, or should I just stay with 308? Purpose is long range steel killing. What bullet would I have to go with. I do handload.

Thanks!

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#5690549 - 04/08/15 03:36 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9433
Loc: Lewisville, TX
IMO, no, I'd go 308, since it's a gas gun. I can kill steel just fine with my 308 gas gun. But, you could run the 7mm 160 or 168 grain SMK or maybe the Hornady 162 grain BTHP. It might fit in the mag with a slight jump. You'd have to run the COAL numbers to see if it would fit. Find out the tip to ogive length on each bullet, and then add it to the case length, and that will tell you if it will fit or not at the 2.800".
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#5690558 - 04/08/15 03:43 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9433
Loc: Lewisville, TX
7mm-08 case length = 2.035"

7mm Ogive to tip lengths

168 SMK = .665
175 SMK= .724
162 A-max= .750
162 BTHP (Hornady) would be less than the 162 A0max for sure.

With these numbers and seating the bullet at the ogive, here's your COAL.

168 SMK= 2.700"
175 SMK= 2.759"
162 A-max= 2.785"
The 162 Hornady BTHP would be less than the A-max, so you'd be around 2.740 or so, I'd guess.

The 7mm 168 SMK would give you the most room for seating the bullet out further. If you went that route, then that would be a good 7mm in a gas gun.
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#5690635 - 04/08/15 04:30 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
Varget 7-08 Offline
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Registered: 04/04/10
Posts: 4968
Loc: SA / Helotes, TX
The info is much appreciated, Chad. So overall, you'd still choose 308?

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#5690647 - 04/08/15 04:40 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9433
Loc: Lewisville, TX
Honestly, a 308 is hard to beat. If you wanted a little more BC than the 708 would be good.

G1 BC of a 175 SMK = .475

G1 BC of:

7mm 168 SMK= .565
7mm 162 Hornady bthp= .610

Those BC numbers would give you some advantage in the wind out past 500 yards, especially the 162 bthp. A 162 bthp in the 708 pushed about 2650 to maybe 2700 would be nice.
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#5690982 - 04/08/15 08:21 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
barnjoer Offline
Bird Dog

Registered: 03/30/12
Posts: 290
Loc: Close to the Heart of Texas
7mm08 & 243 & 308 all use the same mags. I have an DPMS AR 10 & @ Remington R 25's, one in 7mm08 & one in 243. All 3 use the same mags. The DPMS mags work just fine in the Remington's & vice versa. Magpul also work in both.
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#5691105 - 04/08/15 09:29 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
The 140 vld is maybe a option depending on chamber. There are also rumors of a 140 hybrid which would work very well.

The 168gr Sierra is one I've played with a good bit and really like the ease of loading and accuracy.
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#5691169 - 04/08/15 10:01 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
6.5x47Lapua Offline
Tracker

Registered: 12/13/14
Posts: 518
Loc: dfw
The sierra 7mm 168 has a .488 g1 bc......may as well just shoot a 308.

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#5691210 - 04/08/15 10:22 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
Furb Offline
Pro Tracker

Registered: 09/06/05
Posts: 1794
Loc: Arlington, TX
These are two quotes from my post when I finished my 7mm-08 AR10

Originally Posted By: Drew in Tejas
Dont worry, you can load the 162s down to mag length. I have shot them out of my bolt gun at 2.750" and did great with them over varget. Start around 39gr and work up slowly. I bet you will see 2650 to 2700fps safely once the barrel is broke in. Also, bad [censored] rifle


Followed by
Originally Posted By: FiremanJG
And the 7-08 Guru has spoken. yingyang


My barrel is having to be throat reamed to to fix a small imperfection from the chamber reamer, but I should have a full range report on 162 Amax loaded to mag length within a month, and also with in that month I hopefully will be able to go take my class with Fireman and he can tell you how he likes it too.
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#5691371 - 04/09/15 06:09 AM Re: 7mm-08 in AR-10 Mags [Re: 6.5x47Lapua]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
Originally Posted By: 6.5x47Lapua
The sierra 7mm 168 has a .488 g1 bc......may as well just shoot a 308.


Litz put the 168gr mk at .565 on g1 bc and that has been spot on for my drop and drift data out to 1000.
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#5691416 - 04/09/15 06:58 AM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
6.5x47Lapua Offline
Tracker

Registered: 12/13/14
Posts: 518
Loc: dfw
Thats a hell of a difference. I just looked it up. .565 is what Litz tested it at.........That's a little strange, usually sierra is almost spot on. Good to know.

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#5691431 - 04/09/15 07:07 AM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
I know I had some reservations when I first gave it a try but it's worked well.
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#5691503 - 04/09/15 07:51 AM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
GLC Online   content


Registered: 02/25/09
Posts: 4117
Loc: Burleson Texas
I actually use 300 win mag magazines for my long action savage 7mm08 chassis gun. No problems at all.
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#5692025 - 04/09/15 11:50 AM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
Varget 7-08 Offline
Extreme Tracker

Registered: 04/04/10
Posts: 4968
Loc: SA / Helotes, TX
Sweet. Just ordered a lower and will order the barrel soon. Best barrel length? I'm think either 20" or 22"

Thanks y'all


Edited by Varget 7-08 (04/09/15 11:50 AM)

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#5692536 - 04/09/15 04:28 PM Re: 7mm-08 in AR-10 Mags [Re: Varget 7-08]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
My ai wears a 22" barrel and I'm very happy with it.
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