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#7129750 - 04/01/18 04:30 PM Which AR10 caliber
bigjoe8565 Offline
THF Trophy Hunter

Registered: 06/30/08
Posts: 5412
Loc: Mesquite, Tx
7mm-08
308
6.5 Creedmoor

Going to build one for hunting and shooting steel at long range. What are the pros and cons of these calibers?


Edited by bigjoe8565 (04/01/18 04:31 PM)

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#7129757 - 04/01/18 04:45 PM Re: Which AR10 caliber [Re: bigjoe8565]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 25518
Loc: Wolfe City, TX
7mm-08

Borrows some speed and BC from the 6.5mm, borrows some energy delivery from the .308.

7mm-08 and 7mm-08 Ackley Impoved are the best at everything. There, I said it. (Yes I have one of each)
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#7129760 - 04/01/18 04:54 PM Re: Which AR10 caliber [Re: bigjoe8565]
kmon1 Offline
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Registered: 09/27/06
Posts: 23397
Loc: Texas
I say 7mm-08 as well. Mine is a bolt action but it has never let me down in 35+ years of hunting with it.
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#7129761 - 04/01/18 04:56 PM Re: Which AR10 caliber [Re: bigjoe8565]
Tye Offline
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Registered: 01/18/07
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6.5 creed. Plenty of factory ammo. I have a 16” and 22” uppers. Both shoot 1/2 MOA. I used a Wilson combat Ranger 16” barrel on my last build. It loves factory ammo
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#7129762 - 04/01/18 04:57 PM Re: Which AR10 caliber [Re: bigjoe8565]
kmon1 Offline
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Registered: 09/27/06
Posts: 23397
Loc: Texas
Not sure what you consider long range but it helps to be a reloader for long range shooting. You can load it more consistently than factory ammo and tailor it to your gun. Also the 160gr range of bullets and some 150gr bullets will have higher BC bullets than most factory ammo which is mostly 140gr.
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#7129765 - 04/01/18 05:00 PM Re: Which AR10 caliber [Re: bigjoe8565]
Tye Offline
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Registered: 01/18/07
Posts: 3401
Loc: Eastland county







Info off the ammo in the 16” barrel
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#7129767 - 04/01/18 05:10 PM Re: Which AR10 caliber [Re: bigjoe8565]
bigjoe8565 Offline
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Registered: 06/30/08
Posts: 5412
Loc: Mesquite, Tx
I do reload, so I can get better/consistent results over factory ammo. I define long range shooting as 1,000-1,300 yards. I can also shoot hogs at one of my setups at 500-700 yards.

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#7129774 - 04/01/18 05:26 PM Re: Which AR10 caliber [Re: bigjoe8565]
FiremanJG Online   content
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Originally Posted By: bigjoe8565
I do reload, so I can get better/consistent results over factory ammo. I define long range shooting as 1,000-1,300 yards. I can also shoot hogs at one of my setups at 500-700 yards.


I still pick 7mm. I have lots of love for 6.5 Creedmoor, and .308, and own all of them. If I had to pick only one to use for lomg range target, and hog hunting, 7mm hands down.
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#7129869 - 04/01/18 07:59 PM Re: Which AR10 caliber [Re: bigjoe8565]
Marc K Offline
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Registered: 11/02/10
Posts: 932
Loc: Eustace, TX
My choice was .308 for the AR platform simply because I do not reload, but I do stack ammo very tall and deep for various reasons.

The .308 fills the slot of a "good all purpose lower cost round" for the AR with decent performance for my needs. The wide range of factory ammo (and 7.62x51 for bulk) makes it universal for me.

I suspect that if I tried the 6.5, I would like it - but I have not.

Marc
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#7129889 - 04/01/18 08:33 PM Re: Which AR10 caliber [Re: Marc K]
Pitchfork Predator Offline
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Registered: 01/25/13
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Loc: Murphy, TX Dickens county
Originally Posted By: Marc in Bastrop
My choice was .308 for the AR platform simply because I do not reload, but I do stack ammo very tall and deep for various reasons.

The .308 fills the slot of a "good all purpose lower cost round" for the AR with decent performance for my needs. The wide range of factory ammo (and 7.62x51 for bulk) makes it universal for me.

I suspect that if I tried the 6.5, I would like it - but I have not.

Marc


I agree for the reasons you pointed out. Yes, you would like shooting the 6.5 CM.

I would add one or both uppers after starting with the 308.


Edited by Pitchfork Predator (04/01/18 08:34 PM)
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#7129983 - 04/02/18 04:00 AM Re: Which AR10 caliber [Re: bigjoe8565]
ZenArchery Offline
Pro Tracker

Registered: 07/21/07
Posts: 1477
Loc: Texas
For what you’re intending 7mm-08
I own a gas gun 6.5 creed for hunting.
My long range precision gun (bolt) is a .308.
7mm-08 has best of both these calibers.
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#7130240 - 04/02/18 11:17 AM Re: Which AR10 caliber [Re: bigjoe8565]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2562
Loc: Houston
Never under estimate the power of cheap ammo. Not everyone has the time, knowledge or inclination to precision reloading every rifle. For this type of rifle and my personal needs, the choice is 308 by a wide margin. But then again, I might ever only own one large frame ar, so the answer is clear for me

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#7130254 - 04/02/18 11:29 AM Re: Which AR10 caliber [Re: bigjoe8565]
jay baker Offline
Light Foot

Registered: 06/15/17
Posts: 32
I like the 308 because it’s $17 a box

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#7130259 - 04/02/18 11:33 AM Re: Which AR10 caliber [Re: bigjoe8565]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 13218
Loc: Lewisville, TX
Originally Posted By: bigjoe8565
I define long range shooting as 1,000-1,300 yards.


I would not be selecting an AR-10 if this was the goal. A 7-08 would be a great choice. But for a 7-08 to fit and feed out of an AR magazine means the high BC bullets desired for long range will have to be seated deep in the case. This will reduce your case capacity (i.e. less velocity), and the bullet will have a long jump to the rifling.

On the other hand, the 6.5 CM round you can seat the bullet out long and still be close to the lands while feeding out of an AR mag just fine. And, the 6.5mm bullets have a high BC and are lighter and can be pushed faster than a 308 or 7-08. For this reason, I would select an AR in 6.5 CM, if 1K+ yards was the goal.

The 308 in an AR will be running out of gas around 900-1000 yards, and may not make it much more past that. It will have much more drop and wind drift than the other rounds. I absolutely love my AR-10 in 308, but it is not a 1K+ rifle.
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#7130262 - 04/02/18 11:34 AM Re: Which AR10 caliber [Re: Korean Redneck]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 13218
Loc: Lewisville, TX
Originally Posted By: Korean Redneck
Never under estimate the power of cheap ammo.


Come spend a day on the range with me, and I'll show you exactly what cheap ammo really means.
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