7.62x39 vs .308

[91RR]

I am considering building either an AR 15 in 7.62x39 or an AR 10 in .308. Anybody have any suggestions?

[Hoser]

What do you plan on using it for?

7.62x39 is fine, but runs out of gas past 400-500 yards compared to a 308. No decent match ammo is avail for it also.

[91RR]

I am looking to build an AR that I can use for hunting here in CO. Mainly for deer and I don't think I have ever taken a shot past 300 yards in the past 5 years most have been about 100.

[Colorado Osprey]

The issue with 7.62x39 AR's has always been magazine reliability and availability. C-products has figured it out... Finally!
I see no reason to ever get a heavy and large AR-10.
There are better semi-auto 308 rifles out there for less money.
The down fall to the 7.62x39 is the lack of velocity compared to the 308.

If that still doesn't sway you, read on.........

Mike Milli of www.dtechsuperstore.com is the pioneer of the WSSM in the Ar-15 platform. He is also instrumental in alternate caliber chamberings for the AR-15 form .17 to .358 chamberings. Not sub-sonics like the SOCOM or the Whispers.

Mike is making/selling a 300/25WSSM wildcat that will perform equal to or greater than the 30-06 fitting into a standard AR-15 lower; with 160-180 grain bullets!! That puts the 308 in the heavy and large AR-10 to shame.

Remington also developed a new 30 cal AR cartridge; Remington's new 30RAR which is their version of a 450 Bushmaster necked down to a 30 cal. That round isn't even getting to 308 velocity with 125 grain bullets. Look closely at the data and they compare the 308 with a 165 grain bullet to the 30RAR and a 125 grain bullet!
http://accurateshooter.wordpress.com...-ar-cartridge/

What say the rest of you??

[Colorado Osprey]

No one else with an opinion?

[91RR]

I think I might have found what I want. I think I might have to get one of Mike's uppers chambered in .243 WSSM.

I would still like to hear any other opinions out there.

[Hoser]

Easiest conversion is the 223 necked up to 6mm. Its hell on coyotes and should be fine for deer inside 300 yards.

[Colorado Osprey]

Easiest conversion is the 223 necked up to 6mm. Its hell on coyotes and should be fine for deer inside 300 yards.

I have one of those form Mike Milli in a 20 Bull barrel it's called a 6x45... about 30% more power/energy on target over the 223. A bit light for elk though.

[jh308]

I'd go 6.8spc or 6.5grendel if I was inside 300yrd. 6.8spc if I didn't reload. Mine is about 1/2the weight of my 7.62(LR-308) A 85gr TSX traveling 3000fps out of a 10" bbl will have no problems w/deer. Probably a bit light for elk tho.

[AP-4Guy]

I'm not trying to be disrespectful, but I'd be very skeptical of your friends' numbers. Physics being what it is, I just don't believe you can get "30-06" performance out of a round that will fit into a 5.56 magwell. l just don't believe it is possible. I also disagree with your premise that .308 AR's are heavy. They can be, yes, but check into the 16" AP-4 from DPMS. I may sound and look biased, but Google "DPMS AP-4 reviews" and you'll see what I mean.