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 Bushmaster XM15 Accuracy Question
bowhunt4life  [Member]
12/17/2010 4:07:44 PM EST
Hello,
New AR owner here. I took a Bushmaster XM15 with a 20" barrel in a .223 caliber in trade. After cleaning it a couple times and shooting Wolf ammo the gun wouldn't cycle and close the bolt. Switched to remington brass cartridge and seemed to operate fine.

Called bushmaster and it is a Pre-1995 gun.

After shooting some remingon 55gr soft points rounds and dialing in at 100yds I would get a couple rounds that were dead on then it would start spraying rounds and loose accuracy than get accuracy back.

Any suggestions on what it could be? My guess is to stick to the brass ammo, 55gr soft point will help but any suggestions on why it would loose accuracy?

Could it be that the barrel is worn out?

Scope is secure. Slop is tight between upper and lower.

Thanks for any help.
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jokermann77  [Team Member]
12/17/2010 4:47:28 PM EST
My bushy doesn't like wolf! I refuse to put any in my gun! The first time I did I had some problems but what is funny is my Bushy will eat brown bear just fine.

Enjoy your bushy!
southerncross  [Member]
12/17/2010 4:51:01 PM EST
more likely than anything you're using standard ammo, not match grade. don't expect 1moa groups out of standard remington ammo. their accuracy is moderate at best, and you can go ahead and ditch the wolf ammo completely for accuracy testing. its common to have a bad lot/box of ammo that won't cycle your gun, thats why its so cheap.

if you want to really test the accuracy of the barrel (by the way i have the exact same rifle you do) then get some hornady tap or black hills ammo. i've heard federal gold match is also good, but i have no experience with it. these brands should be very good benchmarks for accuracy from a barrel you are questioning. your rifle is made for 2moa accuracy, so 2 inches at 100yards out of a 10 shot group is completely acceptable.

how far are you shooting to judge accuracy? what scope are you using? are you using a bench rest or sled or are you shooting off hand?

i can tell you now that my bushmaster 20" hbar is very accurate with good loads like i listed above, but is only decent with subpar ammo.
ArmyInfantryVet  [Team Member]
12/17/2010 6:01:29 PM EST
maybe you can try putting in a lighter buffer and that might help.

But regardless, Wolf is underpowered. When I had my bushmaster, if I was firing brass, it always would completely cylce. Where as with Wolf, it wouldn't fully cylce the weapon because it wasn't pushing the bolt carrier back far enough.

And as far as your groups loosening up as you shoot it more and then come back after you give it a rest, that is probably because you have a cold bore zero. So your groups are going to naturally grow in size as the barrel gets hotter, it's not a flaw with your rifle.
pun  [Member]
12/17/2010 6:13:09 PM EST
How are you lubing the rifle genberously or light coat?ARs work best lubed well and if its still new break it in with 500 rds of full power brass ammo before using wolf.
southerncross  [Member]
12/18/2010 4:52:33 AM EST
Vet, i've noticed the same thing when shooting wolf steel cased. I use H buffers in my carbines, and i have to switch back to a lightweight buffer to fully cycle the bolt when using it. my luck has been hit and miss as far as reliability, and every time its been a case of having an underpowered lot of ammo.

i've had better luck with the silver bear ammo. it seems to be more consistent in regards to velocity.
bowhunt4life  [Member]
12/18/2010 8:49:16 AM EST
I appreciate the information. I would agree Wolf is out!!

I don't think it is a wore out barrel either.

We are shooting at 100 yards and will be trying again tomorrow with the Remington 55gr brass ammo.

My use for the gun is coyotes and feral cat sniping.

2" at 100 yards is my goal and realize I may have to try a variety of ammo.

I think once I get it close with the brass I'll jump to a match grade and most likely hunt with that.

I called bushmaster and had them run the serial number on the lower reciever, the guy laughed because their computer system only went back to 1995 and the serial number I had was older than that.

As for lubing the barrel any recommendations?

Thanks,
Chris
Another-Bill  [Team Member]
12/18/2010 9:35:14 AM EST
Your barrel is chrome lined so lubing the internal is not very necessary at all. Just a dab.
For the exterior I have always used Break Free CLP, I also use it every where, inside and out.





Good Luck
Bill
SplatSTi  [Team Member]
12/18/2010 10:54:55 AM EST
Strange, both mine love wolf.
stpolaris  [Team Member]
12/18/2010 11:40:40 AM EST
Bushmasters in general tend to have good accuracy, better than some of the "top tier" ARs..


Esq1118  [Member]
12/18/2010 12:42:03 PM EST
Yeah my Bushmasters have been pretty accurate. Try some different makes of ammo first before making your final judgment on your gun. Winchester and Federal have been pretty good for mine. I ve always been told to stay away from Wolf unless it was an AK weapon. AKs eat anything.
Thefryzone  [Team Member]
12/18/2010 1:51:44 PM EST
Originally Posted By ArmyInfantryVet:
maybe you can try putting in a lighter buffer and that might help.

But regardless, Wolf is underpowered. When I had my bushmaster, if I was firing brass, it always would completely cylce. Where as with Wolf, it wouldn't fully cylce the weapon because it wasn't pushing the bolt carrier back far enough.

And as far as your groups loosening up as you shoot it more and then come back after you give it a rest, that is probably because you have a cold bore zero. So your groups are going to naturally grow in size as the barrel gets hotter, it's not a flaw with your rifle.


+1
Another-Bill  [Team Member]
12/18/2010 2:33:43 PM EST
Originally Posted By stpolaris:
Bushmasters in general tend to have good accuracy, better than some of the "top tier" ARs..





+1

Currently I have 4 Bushmasters, a Varminter, a 20" V-Match, an A4 clone and a 16" HBAR 3-Gun setup.
I have owned many others in the past and I have continued to buy them because of their accuracy and reliability, regardless of the "flavor-of-the-month" brand fan clubs.

Currently I have 3 Colts, a 6450 (9mm) and two 6920s and I have had many others in the past. They have not performed any better or worse than the Bushmasters.





Bill
jaygee  [Member]
12/18/2010 4:40:10 PM EST
My MOST accurate AR...most accurate of any rifle I own is a Bushy 20" FHBAR A2. It's crazy accurate with Federal 69grn. Match.
Never tried Wolf but shot it for years with SE Asian M193 knock-off...with reasonable accuracy and total reliability. Great weapon!
Branspop  [Team Member]
12/18/2010 5:47:16 PM EST
Originally Posted By bowhunt4life:
As for lubing the barrel any recommendations?


http://vickerstactical.com/tactical-tips/weapon-lubrication/

http://www.ar15.com/forums/topic.html?b=3&f=7&t=502758

http://www.ar15.com/content/swat/keepitrunning.pdf
An7oine  [Member]
12/18/2010 7:49:32 PM EST
This is my Tax Time A4 upper group pics.. This is 5 rounds at 50m. using a Aim Point. It is obvious I pulled one of the shots.
I did not know about the 10 round Molon method at the time.

bowhunt4life  [Member]
12/19/2010 8:05:38 AM EST
All great feedback. I am going to try some new ammo on Thursday. Honey do list and kids are keeping me busy, not busy enough to respond though.

Will post what I find on Thursday.

Thanks.
tx318  [Team Member]
12/19/2010 4:44:21 PM EST
Mine is deadly accurate
omega62  [Life Member]
12/19/2010 5:22:16 PM EST
My Bushmaster XM-15 is extremely accurate.
bowhunt4life  [Member]
12/25/2010 9:55:30 AM EST
Problem appears to be solved. I cleaned the gun up real good. Picked up some Remington .223 ammo and after a few rounds tweaking the scope life is good.

It appears my AR likes Remington UMC .223 brass, okay by me as 50rds are $21.


Thanks for all the input and help and Merry Christmas all!
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