New 6.5 Grendel zeroing issues

[Fly]

the gun is a brand new build, all quality stuff, 20 inch heavy barrel 6.5 grendel. Now I ran about 60 rounds through it just shooting it because I was told that it will take about 100 rounds through it before you will be able to zero it. so I have now spent 2 days at the range trying to dial it in. It has a 4x12 vortex scope on it with a aero precision mount so the gear is good, I am shooting 123 grain hornady sst match ammo and the thing is all over the paper. If anyone has any ideas or a protocal I should follow or anything like that I am all ears. First thing I am going to do is try some different ammo to start................. then what ????
help please

Thanks Fly

 

[TonyTheTiger]

You'll get more info here than the Bear Pit, so that's a step in the right direction, but you still haven't given enough details for anyone to help you.

 

[Yondering]

because I was told that it will take about 100 rounds through it before you will be able to zero it.

For starters, don't take any more advice from the person who told you that. It's bad info and indicates that person doesn't know what they're doing.

Start with the basics - do you have your rifle shooting fundamentals down, or are you learning to shoot? I.e. is the problem you or the gun? Plenty of guys talk about shooting tiny bughole groups but can barely stay on paper when they get to the range because they never learned the fundamentals of shooting.

When you say the rifle is a "build" what does that mean exactly? Did you assemble it, or a shop somewhere? Was it assembled right? What's your skill level there? Assembling an AR that'll go bang is pretty straight forward, but there are a few things you can do wrong that'll mess up accuracy. It's hard to guess where you're at on this stuff without more info.

Finally, what exactly are you doing when you're trying to zero the rifle, and how are you set up? Describe your method of trying to zero the rifle.