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

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  #41  
Old 05-14-2013, 8:22 PM
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M3thodBombZ M3thodBombZ is offline
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I thought cold hammer forged barrels were suppose to hold at that 1" MOA for at least 15k to 20k?
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  #42  
Old 05-14-2013, 9:35 PM
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Quote:
Originally Posted by mif_slim View Post
I seriously want a usedor shot out barrel... randel you have any you wanma get rid of?
I have seen a bunch of them but I usually cut them up to make spacers and tools.

I might have one in the scrap bin though...
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  #43  
Old 05-14-2013, 9:35 PM
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Default I'm the OP and I agree with Randall

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Originally Posted by ar15barrels View Post
Yes.
The same barrel SHOULD shoot sub 1/2 moa when it was new.
So if the group sizes have DOUBLED, I would consider it "shot out".

Also, the OP has changed his tune from "sub moa" to "2 moa with match ammo".
2 moa with match ammo is definetly shot out.

Randall actually cut this barrel and pinned the flash hider on it a couple years ago and it shot GREAT until recently, even after a thorough cleaning with copper cutter, etc. Rifling still looks good to my untrained eye but I'm taking it to a gunsmith tomorrow to get the headspace, throat wear, and muzzle crown checked out just to make double sure.
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  #44  
Old 05-14-2013, 9:37 PM
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Originally Posted by M3thodBombZ View Post
I thought cold hammer forged barrels were suppose to hold at that 1" MOA for at least 15k to 20k?
Keep thinking that.
If you never get them hot, they might hold their accuracy to 8000 rounds.
I don't know anyone that does not do a couple mag dumps now and then though...
My last 3gun barrel lasted about 6000 rounds before it was shooting 8moa and I finally threw it away.
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  #45  
Old 05-14-2013, 9:41 PM
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Originally Posted by hkusp View Post
Randall actually cut this barrel and pinned the flash hider on it a couple years ago and it shot GREAT until recently, even after a thorough cleaning with copper cutter, etc. Rifling still looks good to my untrained eye but I'm taking it to a gunsmith tomorrow to get the headspace, throat wear, and muzzle crown checked out just to make double sure.
Look down the bore from the chamber end of the barrel with the barrel pointing at a strong white light.
Look at the sharpness of the corners of the lands about 6" down the barrel from the throat.
Then compare that to the sharpness of the lands 1/4" in front of the throat.
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  #46  
Old 05-15-2013, 10:27 AM
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Originally Posted by ar15barrels View Post
Keep thinking that.
If you never get them hot, they might hold their accuracy to 8000 rounds.
I don't know anyone that does not do a couple mag dumps now and then though...
My last 3gun barrel lasted about 6000 rounds before it was shooting 8moa and I finally threw it away.
I think the 15k-20k round life would be more of a functional round life advertised by manufacturers, not necessarily how it holds accuracy. Not claiming to be any sort of expert on the matter though.
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  #47  
Old 05-15-2013, 10:40 AM
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Originally Posted by MrPlink View Post
^ I agree completely about the Rds. People make too much of it and forget that if you have good fundamentals you can still make hits.
It's all about what your POI is with a 4+ MOA dot. If you're just floating it over "somewhere in the black", yeah, the results are not going to be too impressive
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So suck it HK, If I wanted an $800 pistol with a crap trigger I would just go buy 2 Glocks.
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  #48  
Old 05-15-2013, 10:41 AM
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Originally Posted by ar15barrels View Post
If you believe the internet...

However, in real life, 5000 rounds is realistic round count for 5.56 AR barrels to have their group sizes double from new.
if thats the case then my LMT piston barrel should have been replaced 9 months after i bought it!
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  #49  
Old 05-15-2013, 10:45 AM
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The method of shooting is more meaningful than round counts. If you are doing slow fire, you will get a lot less wear than doing full auto mag dumps.
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eh why bring logic into this, that makes too much sense... besides when you have bested a fool, you have accomplished nothing and he is a fool.
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  #50  
Old 05-15-2013, 1:38 PM
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Originally Posted by watchguy View Post
I think the 15k-20k round life would be more of a functional round life advertised by manufacturers, not necessarily how it holds accuracy. Not claiming to be any sort of expert on the matter though.
The issue is "when is a barrel no longer functional?"
My answer to that is when I can't consistently hit 2moa targets with it.
If you enlarge the acceptable target size to 12moa, you can certainly keep shooting it to 20k rounds or more.
I just find that accuracy level unacceptable and will rebarrel when I see accuracy falling off...
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Last edited by ar15barrels; 05-15-2013 at 1:41 PM..
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  #51  
Old 05-15-2013, 1:40 PM
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Originally Posted by orlydose1 View Post
if thats the case then my LMT piston barrel should have been replaced 9 months after i bought it!
What are your accuracy requirements?
What ammo do you use?
What round count are you at on that barrel?
What accuracy are you getting?
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  #52  
Old 05-15-2013, 2:01 PM
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I have always read that there is no hard and fast # as to how long the barrel will last. It matters how you use it. Heat is the enemy of long life
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  #53  
Old 05-15-2013, 2:14 PM
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I agree with Randall as ive shot out 2 WOA barrels before, with similar results and round count around 7k. However, I think your accuracy is more than acceptable so how big is your target? One thing I noticed is when my barrels started going downhill, the groups opened up more quickly once I identified the issue.
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  #54  
Old 05-15-2013, 3:14 PM
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Originally Posted by SuperSet View Post
I agree with Randall as ive shot out 2 WOA barrels before, with similar results and round count around 7k. However, I think your accuracy is more than acceptable so how big is your target? One thing I noticed is when my barrels started going downhill, the groups opened up more quickly once I identified the issue.
8" patterns (not groups) on 8" targets @ 100yds. New barrel on the way.
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  #55  
Old 05-20-2013, 10:29 AM
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Pick up a mix of different 55grn offerings, see how each of them group using a telescopic sight, and you'll have a better idea about how much life is left in a barrel.

I run a lightly configured AR with a 14.5" chrome lined skinny contour barrel. With cheap Turkish 62grn fmj's I was getting 2" groups at 50 yards! Using some Winchester white box 55grn that group shrunk to about a half to three-quarter inch groups. And using some match stuff I was shooting three shot groups that equated to about 1 MOA. I didn't have the same milage on my barrel as you, but the ammo choice made a huge difference.

Don't write your barrel off yet! Get it properly cleaned (de-coppered), lube it back up, and get it leaded again. You should hopefully see it start grouping nicely again with your bulk ammo - provided that that ammo isn't giving your gun indigestion!
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  #56  
Old 05-20-2013, 10:38 AM
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Ok... i thought the OP said 1/2moa with match... now it's 2moa. Yes given the round count, i'd say the barrel is shot out.

Listen to Randall... err AR15barrels... he knows his stuff.
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  #57  
Old 05-20-2013, 10:51 AM
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Quote:
Originally Posted by HK Dave View Post
Ok... i thought the OP said 1/2moa with match... now it's 2moa. Yes given the round count, i'd say the barrel is shot out.

Listen to Randall... err AR15barrels... he knows his stuff.
Well he did say in the original post that he was getting sub moa with 69gr., but then a few posts later it turned into 2 moa, go figure.
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  #58  
Old 05-20-2013, 5:19 PM
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Quote:
Originally Posted by hkusp View Post
Ammo has all been Federal XM193 55grn brass-cased bulk since I got the gun.
Has it all been the same lot?

That's the problem with Federal XM. Like Forrest Gump's chocolates, you never know what you're going to get. It LOOKS like surplus ammo, but it isn't. One lot might be just as good as the stuff the military accepts and uses, the next lot might be pretty crappy. There's no real standard to be "XM", so who knows what you're going to get. That's why all my semi-serious to serious ammo is military surplus. It's been accepted by a military somewhere as being good to go. Unfortunately it's getting very hard to find in 5.56.

I would try some top line stuff. Like 55 gr soft points or ballistic tips intended for hunting that come 20 to a box. It's expensive, but you're only testing your barrel, so one box should be plenty.
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  #59  
Old 05-20-2013, 8:37 PM
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Check this out.


http://forums.gunboards.com/showthre...-metal-bullets
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