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Old 01-20-2012, 02:43 PM
lavivrus lavivrus is offline
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Default 308 vs 7.62



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I'm getting a hunting/survival rifle and I've been looking at POF308, DPMS LR-308B and DPMS Mark 12 7.62

http://www.pof-usa.com/p308/P308-20-MRR-H.htm
http://www.dpmsinc.com/store/products/?prod=4852
http://www.dpmsinc.com/store/products/?prod=5758

The POF says it's chambered in: "CHAMBER: 7.62 X 51 mm NATO (.308 Win)"

The Mark 12 is obviously 7.62
but the DPMS LR-308B is in 308. So for a survival rifle that I want to be able to get the most kinds of ammo through, it sounds like the 7.62 is the way to go as it's slightly wider.

Can anyone else opine about this please?
Old 01-20-2012, 03:29 PM
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Its the same round. You'll find people on the intranet like to split hairs thats all.
Old 01-20-2012, 03:33 PM
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The only difference is max chamber pressure is higher in .308 win that 7.62x51.
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Old 01-20-2012, 03:38 PM
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Quote:
Originally Posted by lavivrus View Post
I'm getting a hunting/survival rifle and I've been looking at POF308, DPMS LR-308B and DPMS Mark 12 7.62

http://www.pof-usa.com/p308/P308-20-MRR-H.htm
http://www.dpmsinc.com/store/products/?prod=4852
http://www.dpmsinc.com/store/products/?prod=5758

The POF says it's chambered in: "CHAMBER: 7.62 X 51 mm NATO (.308 Win)"

The Mark 12 is obviously 7.62
but the DPMS LR-308B is in 308. So for a survival rifle that I want to be able to get the most kinds of ammo through, it sounds like the 7.62 is the way to go as it's slightly wider.

Can anyone else opine about this please?
An accurate semi auto rifle in 308 win is a fine place to start. While the military ammo uses a slightly thicker brass case, resulting in a smaller internal volume. The external dimensional are the same and military and commercial ammo all shoot out of these guns.

You may run across rifles in 308 win with barrel lengths ranging from 16 to 24 inches. I prefer 18-20 inches if possible.

Ps, the 308 win is a dream to hand load.
Old 01-20-2012, 09:06 PM
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As far as barrel length goes, it isn't that big of a deal.

A few years back we were in the shop and got wondering what effect barrel length would have on velocity in the .308. We got out a Remington PSS with a 26" barrel, an older version of the PSS with a 24" barrel, my Remington 700 ADL with a 22" barrel and a Remington LTR with a 20" barrel. Using Federal Gold Medal Match ammo we shot all four over the Chronograph and looking at all the data, you couldn't tell which set was shot from which gun, they were that close.

We then got a XP-100 out and a 22" Remington take off barrel. We cut the barrel down to 18" and shot it over the chrono. Velocity did drop off some (about 75-100fps from the earlier data). We then cut the barrel to 17" and again about 75fps drop off from the 18" barrel. We then cut it to 16" and this time about 150fps drop. At 15" the drop was something like 200fps. We did cut it to 14", but by that point the muzzle blast was more than you wanted your chrono in front of.

The next .308 I have planned will be an 18" barrel though. Yes you loose a little, but the handiness of the short barrel would be great.

The one comment all that shot with us that day made was that as the barrel length went down, even from the 26" to the 22" the increse in muzzle blast was very noticable.
Old 01-20-2012, 09:19 PM
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Quote:
Originally Posted by lavivrus View Post
I'm getting a hunting/survival rifle and I've been looking at POF308, DPMS LR-308B and DPMS Mark 12 7.62

http://www.pof-usa.com/p308/P308-20-MRR-H.htm
http://www.dpmsinc.com/store/products/?prod=4852
http://www.dpmsinc.com/store/products/?prod=5758

The POF says it's chambered in: "CHAMBER: 7.62 X 51 mm NATO (.308 Win)"

The Mark 12 is obviously 7.62
but the DPMS LR-308B is in 308. So for a survival rifle that I want to be able to get the most kinds of ammo through, it sounds like the 7.62 is the way to go as it's slightly wider.

Can anyone else opine about this please?
None of the above, get one of these. Just trust me on this okay?
http://www.springfield-armory.com/armory.php?version=38
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Old 01-20-2012, 11:19 PM
Tackleberry41 Tackleberry41 is offline
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Where you might run into an issue is that military ammo like said has thicker walls, mostly for durability. It has to be able to go thru belt fed weapons. Something like a CETME it is not recommended to use civilian 308 like you would buy at wal-mart in their ejection can pull the softer thinner cases apart, leaving the front half in or ripping the rim off. Not going to happen every time but all it takes is once.

There was a write up somewhere about the ever so slight differences between US 308 and NATO spec 7.62, like there is with 223/5.56.

They say the same thing about the Hakim rifles the ejection will potentially rip civilian 8mm cases apart.
Old 01-20-2012, 11:39 PM
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ALL COMMERCIALLY LOADED 308 AMMO IS LOADED HOTTER , TO HIGHER PRESSURES THAN WHAT NATO LOADS ARE !
http://www.303british.com/id36.html
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Old 01-21-2012, 01:18 PM
sniperfx sniperfx is offline
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dpms will shoot either round without issue per their website and my personal experience....
Old 01-24-2012, 09:27 PM
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For those willing to read:

http://www.thegunzone.com/30cal.html

http://www.fulton-armory.com/%5Cfaqs...FAQs%5C308.htm
Old 01-24-2012, 09:56 PM
lavivrus lavivrus is offline
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I ended up just contacting DPMS to get an answer.

Quote:
With rifles from DPMS a 762x51 chamber can and will shoot both rounds just fine. The 308 chambered rifles ONLY shoot 308 in the rifle


Thanks,


Mark Imholte | Customer Service
DPMS Firearms,
Old 01-25-2012, 09:30 PM
robo7de robo7de is offline
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I shoot 7.62x51 in ALL my .308 rifles (bolt & semi's) with no problems what-so ever. I you have the option, get a 1-10 twist barrel to better handle the heavier bullets. 7.62=looser chambers and lower pressures//// .308 = tighter chambers and higher pressures. Stay away from Indian surplus
Old 01-28-2012, 02:20 AM
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You should read this.
http://www.thegunzone.com/30cal.html
Old 01-28-2012, 06:05 AM
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Waldlaeufer Waldlaeufer is offline
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Quote:
Originally Posted by robo7de View Post
I shoot 7.62x51 in ALL my .308 rifles (bolt & semi's) with no problems what-so ever. I you have the option, get a 1-10 twist barrel to better handle the heavier bullets. 7.62=looser chambers and lower pressures//// .308 = tighter chambers and higher pressures. Stay away from Indian surplus
.308 has tighter chambers.

My Rem700 in .308 does not like mil-spec 7.62x51. You can shoot ist but repeating is not as smooth as with .308 ammo. It seems to get "stuck" in the chamber (the 7.62x51).
Old 01-28-2012, 11:54 AM
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My bolt shoots amazing groups out of old german surplus. I hope I don't explode shooting the super awesome MILSPEC rounds.
Old 01-29-2012, 02:30 AM
Patchy Patchy is offline
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Issues with 7.62x51 out of a .308 chamber may have issues with the firing pin not having a strong enough spring to consitantly strike and ignite a hardened military primer. Manufacturers have to be very conservitive when making saying what ammo a rifle will and will not shoot. Meaning if there is a small chance that it will not go bang and being the rifle's fault they will say don't shoot it.
Old 01-29-2012, 11:33 AM
buttercup12346 buttercup12346 is offline
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I have an ak47 but I want a finally for survival and somewhat of a hunting round. And it a lot of stopping power for big 7 foot crackhead
Old 01-29-2012, 11:34 AM
buttercup12346 buttercup12346 is offline
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I mean fnal. Not finally. Gay correction ****
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