14.5 ACOG with 16" barrel?

[Wow]

I have a 4x ACOG that is made to be used with a 14.5 barrel. I actually have a 16" barrel. How big of a deal is that?

[1168]

I have a 4x ACOG that is made to be used with a 14.5 barrel. I actually have a 16" barrel. How big of a deal is that?

Its fine. True your zero at whatever range you can shoot.

[markm]

Depends on your ammo. Using different ammo is a bigger problem than barrel length. Shooting very similar ammo, zeroing with that ammo, and knowing your points of impact will help.

[Wow]

what change, if any would I notice?

I shoot 55gr federal xm193

[1168]

what change, if any would I notice?

I shoot 55gr federal xm193

Lets establish your requirements. How far are you trying to shoot, and at what size target?

[Wow]

my range goes out to 600. They have targets from grapefruit size to man size.

[1168]

my range goes out to 600. They have targets from grapefruit size to man size.

Independent of optic and barrel, you’re gonna hate XM193 at that distance. If you true the Z at 4, 5, or 6, and then experiment a bit, the ACOG won’t be your limiting factor.

[Wow]

I zero at 100 yards right on the dot of the reticle. I'll just give it a go I guess.

[1168]

I zero at 100 yards right on the dot of the reticle. I'll just give it a go I guess.

Sweet. Let us know how you fare.

Edit: I just checked my chrono data, and Fed XM193 was much better than Winchester, FWIW.

[markm]

what change, if any would I notice?

I shoot 55gr federal xm193

Depending on your barrel, ammo changed can change your POI enough to be annoying. Windage shifts are the most irritating.

The reticle will track pretty good if your zeroed at 100.