Which ammo for sighting in new AR15

[m41]

I have just purchased a new Sport and was wondering which ammo would be the best to start out sighting in the rifle. I know every gun is different but would you use very good ammo or I have a lot of Remington UMC 55 gr would that be the best since that is what I will be shooting the most.

 

[67tempest]

Sighting in AR

Sight it in using the ammo you intend to fire in it.

 

[S&WOkie]

Sight it in using the ammo you intend to fire in it.

This^^

I sighted mine in with TulAmmo because that is what I shoot at the range.

I couldn't ask for any better results.

If I decide to use it for hunting, I will check it with the ammo I will use for the hunt.

 

[CoMF]

67tempest said it best: Sight it in using the ammo you'll be shooting the most of.

I sighted my M4(gery) in with Winchester Q3131 M193 ball using the Santose IBSZ. It's a Colt. Please don't rib me for it.

 

[WR Moore]

At practical distances, you're not going to see much difference in POI between 55 gr & 62 gr ball. Or between the products of different makers....unless you run across some old Winchester stuff with a different bullet than currently used. I've got some and it prints about 3" vertically different at 100 yards.

 

[What the]

m41,

You answered your own question, it makes no sense to sight it in with different weight or manufacturer for that matter. You should have a blast with your new Sport.

 

[Stu Honea]

I use a 100 yard battlesight zero with 62 gr. as that is about all I'm interested in for my own use. I have a stash of the MK318 Mod 0,and also Federal Fusion in the same weight.
I buy M855 for training.but 55 gr will work just as well for practice. You can actually zero for a couple of different loads and just mark your settings.

 

[125JHP]

Not being instantly familiar with that model I would look at the twist rate first then pick an optimal bullet weight. I then initially sight in a 25Meter BSZ then try them further out. I find there is a difference in some ammo with Q3131A being better than most in velocity and accuracy.... in my gun.