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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 04-24-2011, 8:28 PM
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Old 04-24-2011, 9:22 PM
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7.62x51 is not dead
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Old 04-24-2011, 9:39 PM
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The 7.62x51 most likely will never die.. But it is funny that after the government so much money on the m110 that now they want one shorter n lighterweight..
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Old 04-24-2011, 9:56 PM
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is 7.62x51 to 308 as 5.56x45 is to .223?
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Old 04-24-2011, 10:00 PM
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Quote:
Originally Posted by morfeeis View Post
is 7.62x51 to 308 as 5.56x45 is to .223?
Sort of. 5.56 is loaded to a higher pressure than .223 while .308 is the higher pressure between 7.62x51 and .308
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  #6  
Old 04-24-2011, 10:06 PM
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Quote:
Originally Posted by morfeeis View Post
is 7.62x51 to 308 as 5.56x45 is to .223?
5.56 is to .223 as .308 is to 7.62X51. Clear as mud?

They seem to have been influenced by 3-gun technology:

13. Back up sights: Iron sights offset 45 deg from the DOS.
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  #7  
Old 04-24-2011, 10:12 PM
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Sort of. 5.56 is loaded to a higher pressure than .223 while .308 is the higher pressure between 7.62x51 and .308
Thanks for clearing that up, i thought NATO rounds where higher pressure most of the time?
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Old 04-24-2011, 10:20 PM
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also isn't the new military 5.56 round a heavier bullet compared to older .223 and 5.56 rounds? I know the rifle twist is different.
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Old 04-24-2011, 10:53 PM
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Bigger, smaller, bigger, smaller, in between, semi auto, full auto, burst fire..

What's it gonna be?
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Old 04-24-2011, 10:56 PM
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Its a doable request with off the shelf components, shoot, I could probably pick out everything needed in less than 20 minutes.
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Old 04-25-2011, 6:14 AM
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Dont shoot a 5.56 out of a .223 chambered barrel.

Dont shoot a .308 out of a 7.62x51 chambered barrel.

5.56 has higher pressure than .223
.308 has higher pressure than 7.62x51 NATO.

These are generalities and can vary depending on the loads, but there it is. If you like your fingers, arms, face and gun the way they are, then just dont do it
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Old 04-25-2011, 6:36 AM
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Quote:
Originally Posted by goodlookin1 View Post
Dont shoot a 5.56 out of a .223 chambered barrel.

Dont shoot a .308 out of a 7.62x51 chambered barrel.

5.56 has higher pressure than .223
.308 has higher pressure than 7.62x51 NATO.

These are generalities and can vary depending on the loads, but there it is. If you like your fingers, arms, face and gun the way they are, then just dont do it
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  #13  
Old 04-25-2011, 1:07 PM
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Quote:
Originally Posted by morfeeis View Post
Thanks for clearing that up, i thought NATO rounds where higher pressure most of the time?
The chamber pressure spec. for .223 and 5.56, as well as .308 vs. 7.65 appear to be different, but in reality the actual chamber pressures are nearly the same. Of course the chamber pressures to vary from one brand to another and one type of cartridge to another but it has little to do with whether it is the Nato or commercial spec ammo. The reason for this confusion is that NATO (5.56 and 7.65) and commercial (.223 and .308) ammo pressure testing is done in a completely different way. It is a bit like measuring voltages with an old analog (low impedance) meter and a new digital (extremely high impedance) volt meter. The readings you get would appear to indicate that the voltages are different but in reality they are simply reflective of the different measuring technique. NATO measures the chamber pressure at a different location and with a different measuring device, so they get a different reading, but that does not mean that the actual pressure, if read with the same setup, is actually any different.

But just to be clear, it is absolutely possible to get NATO ammo with higher pressure than commercial ammo, or vice versa.
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  #14  
Old 04-25-2011, 1:21 PM
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NATO caliber ammo should have hard primers for reliable function in semi-automatic and full auto weapons.

.308 that might be perfect in a bolt action rifle might be a disaster in a Navy Garand.

5.56 has a higher SAAMI pressure but only because the military wanted to hot-rod the round and the AR15 was strong enough to handle the pressure.
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  #15  
Old 04-25-2011, 2:04 PM
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They didn't like 6.8SPC or 6.5Grendel.....so whatz next?
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  #16  
Old 04-25-2011, 2:05 PM
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HOLD the phone... by what your saying i can shoot 7.62x51 through my .308?????
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  #17  
Old 04-25-2011, 2:41 PM
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It depends on the gun but more than likely yes.
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  #18  
Old 04-25-2011, 2:49 PM
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Quote:
Originally Posted by Norsemen308 View Post
HOLD the phone... by what your saying i can shoot 7.62x51 through my .308?????
Yes

As always when trying a new ammo, don't go and buy 1,000 rounds before you test it in your firearm
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  #19  
Old 04-25-2011, 2:51 PM
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Please post data on 308 vs. 7.62 x 51...I've always been told and read there is no difference...

as for .223 vs 5.56

IF your barrel or rifle is marked 5.56 then you can SAFELY shoot 5.56 & .223
IF your barrel is marked .223 then shoot ONLY .223 ( in most cases ) some HK rifles were marked .223 but would handle 5.56 performance
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Old 04-25-2011, 3:07 PM
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If you have a well built bolt action rifle that does not have a super tight match chamber, it should be fine to interchange.

7.62*51 was designed to be used in the M14 and because of that it usually works well in semi-auto rifles. .308 might share the same dimensions but the loading might have a pressure curve that doesn't work well in a semi auto. A bolt action rifle should be fine with either unless the chamber makes the bullet set back or some other error that would greatly increase the pressure.
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  #21  
Old 04-25-2011, 4:10 PM
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Item 3, 1.3 M.O.A. dispersion or greater with match ammo? I would hope dispersion would be less with match ammo. Maybe they mean better.
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