Have someone who knows guns check out your set up....

Mounts true.


Or it could just be you having an off day if your a good shooter.

I'd like to think I "know about guns", I'm just not as familiar with the 5.56 round which is why I was asking these forums.

Try different ammo,Federal xm193,Fiocci,Federal American eagle,without getting into the more expensive ammo.We could have the same weapon same set up,Your weapon likes Winchester ,ammo etc,where my weapon likes IMI XM193.I went through all different manufactures for ammo before settling on one. I shoot the same ammo out of my BM and BCM both 16" and group the same BCM 1/7 BM 1/9. 55 gr Federal XM 193.I am very lucky both weapons like the same ammo. TRY DIFFERENT AMMO

Keith

Try shooting at 50 yds.

There may be a problem with the optic or the mount.
If you're not used to a 2 MOA red dot, it could be operator....so try 50 yards where there's more target definition.

I zeroed at 50 before I went out to the 100 yard range. Best group I got was around 1.5 inches which is why I was expecting 3 inches at 100. Assuming it isn't my barrel (which is unlikely from Daniel defense) I'm thinking its either lighter bullets not agreeing with my barrel or it could just be me :(. I guess I'll need another range trip to be sure.

Is that 2MOA at 100yds? At 50yds it wasn't doing terrible. Like I said, my group was around 1.25 inches, it just opened up like crazy at 100 yards :-/.

But I took your advice. Ordered some 62gr rounds to test and this time I'm going to make damn sure the rifle is supported as best I can.

Yeah that's kind of what I was thinking at first, but everyone said ammo and I'm new to AR15s so I didn't question it. It seemed like the click turns were a LOT more than the .3 moa they stated on the website. I kept over shooting the adjustments. Its just odd to me because I've never heard a single bad thing about this scope, even with people using it on .308 rifles which it is not designed for.

I'll give it one more range trip using some different ammo and a lot of sand bags. If it's still being a problem I may have to call up Primary Arms and see what they say.

I would try a heavier bullet. 55g is light for that fast of a twist.

I don't always believe in the "a 1:7 can't shoot this or a 1:9 can't shoot that". My 1:7 Green Mountain barrel LOVES Hornady Match 53gr BTHP It shoots sub-MOA at 200 yds with these. It also loves Hornady 68gr A-max and BTHP, just MOA with these. All these are hand loads.

I suggested a heavier 68gr HP as a 1:7 USUALLY likes these better.

I used to think M193 shot accurate. But 2 MOA at 100 yards Which works into 2 inches each way from your POA (1 MOA barrel) for a 4 inch group. YUCK

Is no one going to asked the questions.

Where you sand bagging, and if so, what part of the front of the rifle was on the bags???


Check rest, what type do you have, or was your head dancing all over the place.

With a 1.7moa dot for the aiming point, his head all over the map behind the scope instead of being a constant, the barrel having pressure input from the sand bags flexing the hell out of it (with maybe even the barrel over heated), and even a trigger pull from hell, can see groups laid down at 6" MOA without batting an eye from a rifle capable of producing much tighter groups.

Dear god, OP "scope didn't seem to be behaving properly" can we all honestly say that a Daniel Defense 1/7 twist barrel is incapable of stabilizing a 55gr FMJ? Which I might add is the most popular bullet for 5.56 and has shot accurately in damn near all of our rifles? Are we nuts? Hell PPU is pretty good ammo compared to the junk I found out the hard way about. It's 6 MOA guys. Even blaming it on bags, barrels, fairies, kings, queens and jokers don't account for MOA that far out of range. I blame the scope.


Shannon

Throwing lawn darts is a great analogy. I really like that Dano523.

Shannon

Did you have iron sights on the rifle before you added the scope? If so, did you try shooting it with just iron sights and, if so, what size groups did you get?

If your only optic is the scope, make sure all the screws on the mounts are evenly tightened like you do with the nuts on a car's wheel –– hand tighten all of them, then go back and forth in a criss-cross pattern, progressively tightening each screw a bit more until they are all torqued the same. But maybe you already know that...

Anything could be wrong with the gun, but it is unlikely the barrel or the ammo or the scope...

At 200 yards, with standard A2 iron sights, I can shoot a benchrested group just under 3 inches. One of the High Master shooters at our range shot my rifle and got it just under 2 inches at 200 yards. That's 1 MOA and it's a RACK GRADE A2 rifle with a 1:9 non-floating 20" barrel (a DPMS, I should add, for all you DPMS haters).

But when the rifle was brand spanking new, all I could get was a 6-inch group at 100 yards and over 12 iches at 200. I was not overly impressed with the rifle's accuracy. But it got better. I told myself that putting a few hundreds rounds through it "broke in" the barrel, but the truth is that I got better at my technique.

Putting a rifle on a sandbag and pulling the trigger is not a technique. The way the rifle's fore-end rests on the bag, the way you hold the grip and the butt, the way you sight in, the way you squeeze the trigger, the way you hold through the shot (follow through), the way you breathe and the way you control your heart rate are all things that need to be focused on... but mainly doing it exactly the same way each and every time.

I'm not implying that you don't know how to shoot, but in any troubleshooting scenario, be it guns or cars or electric nosehair trimmers, you need to start at the foundation and test the YES/NO path from beginning (you, and how you shoot this particular gun) to end (your barrel and your scope).

If it were me, I'd fast-track things: (1) have a known expert shooter try your rifle/scope combo; and/or (2) borrow someone else's scope or optic and zero your rifle on that. Those two options will quickly eliminate two of the three culprits (shooter, barrel, scope)... leaving only one.