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 Post subject: AR15 grouping
New postPosted: February 7th, 2015, 4:30 pm 
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AZS; Woohoo!
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Joined: May 14th, 2011, 7:35 pm
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Location: In the middle of Trouble
I have been playing with a AR that I have had for several years but never shot it with anything but peep sights. I put a nice little 3 power sig optic on it recently and can't seem to group tighter than 6" at 100 yards. The other AR I had, man I could key hole the target easy.
I recently worked my trigger group to what the other rifle was and I got some reading glasses. " I recently noticed I couldn't hardly see up close". Its been over a year since I did any shooting so I'm rusty.
I also got a few different ammo types to run through this barrel. Its a 16" DPMS 1 in 7 twist just like my other one. The other gun loved Hornady 55gr V max. I also have M855 and some 69gr Winchester Match.
I going to go shooting in the morning to see if I can group better.
I got glasses to clear the optic blurr, 3 ammo types, and a really nice trigger. Now to see if it will punch a hole.

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 Post subject: Re: AR15 grouping
New postPosted: February 7th, 2015, 5:14 pm 
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AZS; Woohoo!
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Joined: October 7th, 2008, 8:12 pm
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Location: Prescott Valley, AZ
That optic is a Chinese POS. I would bet the reticle isn't smaller than 6 MOA.

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 Post subject: Re: AR15 grouping
New postPosted: February 7th, 2015, 5:37 pm 
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AZS; Woohoo!
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Joined: May 14th, 2011, 7:35 pm
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Location: In the middle of Trouble
Yea, I aint great. I just wanted to try something like it just to see if a optice on a AR slowed me down. I have had good scopes on AR's for hunting, but they don't do anything for speed. I love red dots, they let me see no matter how I'm shooting.
Trijicon makes one kinda like that sig, but its over a grand. The trijicon is clear and fast for the eyes to adjust to in the store, outside I don't know.
I emagine this sig optic will end up on a 10/22 or 17HMR. For now, it holds zero and I can tune my gun with it. Up close it suck, 50 yards to 100 it aint bad. Don't forget, I aint use to wearing glasses yet either. It sucks!

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 Post subject: Re: AR15 grouping
New postPosted: February 7th, 2015, 5:52 pm 
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AZS; Woohoo!
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Joined: October 7th, 2008, 8:12 pm
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Location: Prescott Valley, AZ
A Trijicon ACOG is nothing like the sig optic. That is like saying Fiat makes a car just like a Ferrari. Two very different types of optics. A Trijicon ACOG is worth every penny; it is a military-grade optic. That Sig is a POS Chinese scope that would be better suited to use on a Nerf gun...or a 10/22 (as long as you never drop or abuse it).

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 Post subject: Re: AR15 grouping
New postPosted: February 8th, 2015, 1:39 pm 
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AZS; Woohoo!
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Joined: May 14th, 2011, 7:35 pm
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Location: In the middle of Trouble
I made my trip to the shooting hole.
Forgot my glasses, so I was still a little blind.
First I put up 3 of those 12" dirty bird targets.
I shot 3 M855 rounds. Took a look, grouped 3 rounds in a triangle around the red spot. No adjustments, put 3 more on the target. Same grouping, triangle around the red spot. No adjustment.
Second I loaded 6 of the 69gr winchester match. Put 3 rounds at the middle dirty bird, grouped tennis ball size group low left. Shot 3 more, same pattern, same spot.
Then I loaded up 6 55gr hornady V max. Sent 3 rounds to the end dirty bird, they patterned tight. Golf ball size pattern but 1 1/2 inch low and right. I moved the optic 2 clicks left and sent 3 more rounds. I'm at 1 1/2 inch low of the red spot. " I dialed it in last time 0 at 200 the best I could". So I adjust up 4 clicks and sent 3 more rounds down. Golf ball group on the bottom of the red spot. I loaded the rest of the Hornady ammo and shot the red spots on the other targets.
The 55gr V max is tight and consistant, but 25 buck a box!
The winchester 69gr is great, but I didn't adjust for it.
I finished with more M855 to readjust, but only to put a triangle around the red spot. Oh well.
I'm going to get more V Max and scope the gun so I can actually see the damn target instead of a image of a target.
I think the trigger job done most of the grouping fix. Before the M855 was on the target, but all over the 12" black area. Maybe with some better optics I will get this gun to key hole.

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 Post subject: Re: AR15 grouping
New postPosted: February 8th, 2015, 2:30 pm 
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Joined: December 4th, 2007, 11:56 am
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Location: Tempe
A 1:7 16" DPMS upper? Had no idea they made one in that twist rate.


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 Post subject: Re: AR15 grouping
New postPosted: February 8th, 2015, 4:15 pm 
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AZS; Woohoo!
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Joined: May 14th, 2011, 7:35 pm
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Location: In the middle of Trouble
Jeff H wrote:
A 1:7 16" DPMS upper? Had no idea they made one in that twist rate.

I'm glad you cought that. I have a 1in 7, might not be that one. I'm taking it apart tomorrow, so I will see. This gun is mostly used stuff that I assembled. Works great, just needs some love.

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 Post subject: Re: AR15 grouping
New postPosted: February 21st, 2015, 6:06 pm 
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Location: Phuk roof top voting machines. My radical right wing extreemists and I are moving on to Guillotines
quietm4 wrote:
That optic is a Chinese POS. I would bet the reticle isn't smaller than 6 MOA.

Beat me to it. Problem is the scope most likely.

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 Post subject: Re: AR15 grouping
New postPosted: March 15th, 2015, 7:27 pm 
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AZS; Woohoo!
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Look at the butt stock if it is an adjustable one also. I bought a new Stag Arms left hand that the buttstock has alot of play on the tube. I could only get groups of 3" or so at 100 yards. Replaced the stock with a fixed stock and now it is grouping around 1".


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 Post subject: Re: AR15 grouping
New postPosted: March 16th, 2015, 11:08 am 
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Joined: December 28th, 2009, 4:02 pm
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Jeff H wrote:
A 1:7 16" DPMS upper? Had no idea they made one in that twist rate.



----------------------------------

Beat me to it,... 8)

I would find out what the twist rate is, for sure.

By the book [smilie=icon_lol.gif] 69 gr. is suppose to be heaviest for 1in9" twist, if memory serves me. 1in7" twist with 69gr. should be fine,... but, there are individual weapons that break all the rules.

Check your twist rate, for starters, imo.
8)

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