Zen of the 100 Yard Zero

[SMT85]

just moved to this zero from the 50 meter zero, thank you for the write up and detail of your post. i am pretty happy with the 100 meter zero, cant see my self switching to anything else.

just took some experimenting with different targets to see what i was aiming at with a 2moa dot, lol

[dogz]

I agree! I just went to the 100 yd zero about a month ago and I am still learning the holds at different ranges. Graet info in this thread. I just want to say Thank you!!

[Glockman1968]

https://www.m4carbine.net/showthread...01#post1627501


A picture is worth a thousand words, by Paul Howe.

[chungdae]

If you zero'd with 223 and then tried to zero with 556 how off would the POI be with 223?

[wahoo95]

If you zero'd with 223 and then tried to zero with 556 how off would the POI be with 223?

Depends.....you'd have to shoot it and see. When you zero with a particular ammo your zero is for that particular ammo. Changing ammo or even changing lots of nother same ammo can affect your zero. Even changes in weather conditions can affect it slightly. This is why its always nice to double check your zero when you have time. All these changes can be small, however I feel its good to know since the changes typically require some sorta adjustment to optics.

[Jimbaran]

This is awesome. Thank you for posting!

[Tzed250]

Bump.

Confirmed my 100yd zero yesterday, then had great fun with reactive steel from 25 to 100yds. It works.

[sboers]

A question:

My rifle has a 100M zero with both the iron sights and my Aimpoint. My iron sights are the LMT BUIS, and they are set up via the RIBZ method (6/3 sight, -6 clicks of travel = 100M setting). I zeroed the irons as per the OP, with the point of impact being approx. 2" high (4" circle, lolipop the target, rounds impact at the center).

How much is this going to change the trajectory at longer ranges?

[T2C]

A question:

My rifle has a 100M zero with both the iron sights and my Aimpoint. My iron sights are the LMT BUIS, and they are set up via the RIBZ method (6/3 sight, -6 clicks of travel = 100M setting). I zeroed the irons as per the OP, with the point of impact being approx. 2" high (4" circle, lolipop the target, rounds impact at the center).

How much is this going to change the trajectory at longer ranges?

With a carbine you would be zeroed for 200 meters and can shoot neck hold on a silhouette at 300 yards.

[sboers]

With a carbine you would be zeroed for 200 meters and can shoot neck hold on a silhouette at 300 yards.

Excellent, thanks.

I have shot steel plates out to 400M with the irons, and simply used the adjustments. Holding COM, I hit the plate. However, the sight lives on the 100M setting 95% of the time, so I was curious what it was doing on paper.

As for the neck hold @ 300M, I assume that doing so places my shot in the chest?