AR10T not grouping

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13 years 5 months ago #8080 by jay6ird
AR10T not grouping was created by jay6ird
Purchased an AR10T new about 10 years ago and it has been in the safe since last year. It has a 24" stainless barrel and I mounted a 10X ZF84 scope. Last year I decided to try it out. I broke in the barrel and shot about 175 rounds of various ammo brands and always getting a flier in each group. Groups are well over an inch + with each type of ammo from Winchester 150grSP to Federal 168 match to Surplus. I was not happy so I tried another scope known to shoot well and got the same results. I put it in the safe for a year. Now this week I brought it out again with a MK4 20X scope and after another 50-75 rounds the rifle will not shoot a reasonable group. Every group has at least one flier that is sometimes over an inch out... Now while cleaning the rifle I noticed that on the front of the bolt only the front of two lugs are worn/scuffed. This means to me that the bolt is not squareing up with the barrel. Now what?

Any comments on this issue? Thanks for any help.

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13 years 5 months ago #8093 by mrfixit
Replied by mrfixit on topic Re: AR10T not grouping
Have you checked;muzzle for dings,COL of the bullets to the "leed" of the riflings,gas system is not leaking,barrel nut is tight,good reciever fit between upper and lower,scopemounts and rings are tight?Is the trigger light enough to use on paper?Is the flyer on your first or last shot fired?(could be a magazine issue)

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13 years 5 months ago - 13 years 5 months ago #8098 by JustMe
Replied by JustMe on topic Re: AR10T not grouping
jay6ird,

My AR-10T didn't group very well during the break in nor with commercial ammo. Once I started using handloads it cut the groups from 2.5 inches at 100yds to now it's shooting 0.5-0.75 inches consistently. See my writeup, "My First AR-10T BNF Range Session."
www.ar10t.com/index.php?option=com_kunen...5&id=4780&Itemid=225

Jer
Last edit: 13 years 5 months ago by JustMe.

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13 years 5 months ago #8208 by Talon57
Replied by Talon57 on topic Re: AR10T not grouping
Since two scopes did the same thing It must be you. i was getting bad groups until I used the second pad of my index finger to pull straight back on the trigger and wham, It grouped wonderfully.

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13 years 5 months ago #8210 by mrraley
Replied by mrraley on topic Re: AR10T not grouping
If possible, post a picture of your target and what ammo you are useing.

The target itself will give an idea of what you might be doing.

The ammo is the second part. Even though the 150's are good, with a 10T you want to go with 168's or better. It states this right in the manual too.

The other thing to look at, is beiing a stainless steel barrel, did you berak it in per ArmaLite's recomendation?

Some of these are factors.

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13 years 5 months ago #8211 by JustMe
Replied by JustMe on topic Re: AR10T not grouping

mrraley wrote: The ammo is the second part. Even though the 150's are good, with a 10T you want to go with 168's or better. It states this right in the manual too.


Raley,
I don't think I'd jump to the conclusion of not using 155 Palma SMK just because the manual says to use 168 SMK. I believe the 155 PSMK came out after the manual was published. Maybe now the manual would recommend using both 168 and 155 SMKs since the 155s shoot so well. IMO.
Jer

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13 years 4 months ago #8212 by Talon57
Replied by Talon57 on topic Re: AR10T not grouping
165 gr loads are grouping best with these rifles, try some of those.

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