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Author Topic: Zero distance?  (Read 47552 times)
BoulderTroll
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« on: July 18, 2015, 12:27:49 AM »

Am I understanding that people are zeroing the BUIS that come with the factory rail to be POA/ POI at 100 meters?  That would make sense to me with their massive height over bore.  How about those running red dots...also 100 meters?  And if you have a 100 meter zero, anyone know where it "returns" to POA/ POI after completing it's arc?  I understand that the 16.5 and 18" barrels will be different, as will different bullet weights.  I'm just asking for rough ballpark numbers. 
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pokemon1989
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« Reply #1 on: July 18, 2015, 12:57:20 AM »

50 yards for irons and 100 for optics.
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WallaceWalcox
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« Reply #2 on: July 18, 2015, 01:06:25 AM »

Am I understanding that people are zeroing the BUIS that come with the factory rail to be POA/ POI at 100 meters?  That would make sense to me with their massive height over bore.  How about those running red dots...also 100 meters?  And if you have a 100 meter zero, anyone know where it "returns" to POA/ POI after completing it's arc?  I understand that the 16.5 and 18" barrels will be different, as will different bullet weights.  I'm just asking for rough ballpark numbers. 
Excellent question. I just got an 18" Tavor and struggled with this issue as far as BUIS and red dot sighting. For now, I sighted the red dot at 100yds and adjust for low POI at closer range. The BUIS which is on extended 22.5 degree offset mounts (Daniel defense, Midwest industries or Weaver) is zeroed at 25yds for close targets...I may reverse the sighting distance later as I would like the red dot for closer targets.


* image.jpg (1525.59 KB, 4096x3072 - viewed 635 times.)
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freefallindan
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« Reply #3 on: July 18, 2015, 12:29:10 PM »

if you go with 75, it'll come back through at 225 and you won't be more than an inch and a half high in between
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BoulderTroll
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« Reply #4 on: July 18, 2015, 12:50:22 PM »

if you go with 75, it'll come back through at 225 and you won't be more than an inch and a half high in between

Interesting!  Thanks, this is exactly the kind of info I'm hoping to hear.  Anyone know the numbers for a 50 or 100 meter zero? 
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Apache
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« Reply #5 on: July 18, 2015, 01:09:48 PM »

With a 1:7 twist I sight in at 75 yards for 55 and 77 grain rounds. What I like is that you can sight in 2.4/2.5 inches low at 25 yards and be virtually dead on at 75 yards and about 3.8 inches low at 300 yards ...
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BoulderTroll
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« Reply #6 on: July 18, 2015, 01:41:49 PM »

With a 1:7 twist I sight in at 75 yards for 55 and 77 grain rounds. What I like is that you can sight in 2.4/2.5 inches low at 25 yards and be virtually dead on at 75 yards and about 3.8 inches low at 300 yards ...

Thanks!  And for clarification, you're talking specifically the Tavor right?  Your 1:7 twist comment threw me off because the Tavor only comes in 1:7.  An AR will be quite different from the Tavor due to the latter's incredible height over bore. 
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Apache
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« Reply #7 on: July 18, 2015, 02:57:46 PM »

When I put the numbers in the Hornady ballistics calculator I used my Tavors sight height which is about 3.5 inches - 3.75 inches depending on what sight I'm using ...

LINK: http://www.hornady.com/ballistics-resource/ballistics-calculator
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e-money
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« Reply #8 on: July 18, 2015, 03:19:24 PM »

I basically came up with the same as you using that hornady site. I also found this site to be helpful:

http://www.shooterscalculator.com/point-blank-range.php
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BoulderTroll
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« Reply #9 on: July 18, 2015, 03:22:59 PM »

When I put the numbers in the Hornady ballistics calculator I used my Tavors sight height which is about 3.5 inches - 3.75 inches depending on what sight I'm using ...

LINK: http://www.hornady.com/ballistics-resource/ballistics-calculator

OK, you are officially my new hero.  I mean really.  HERO.   Grin

I had no idea that site existed.
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Prominus
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« Reply #10 on: July 18, 2015, 05:55:21 PM »

I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.

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BoulderTroll
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« Reply #11 on: July 18, 2015, 06:03:30 PM »

I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.



I agree that a 25-300 zero is excellent on an M4 that has a 2" height over bore.  A 25m zero on a Tavor I'd think you'd be shooting indirect artillery fire in the next zip code...these things are TALL!  Cheesy
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repo
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« Reply #12 on: July 18, 2015, 06:54:39 PM »

I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.



I agree that a 25-300 zero is excellent on an M4 that has a 2" height over bore.  A 25m zero on a Tavor I'd think you'd be shooting indirect artillery fire in the next zip code...these things are TALL!  Cheesy

what he said, and if you look in the back of the tavor manual it calls for a 50 - 250 zero and some others have mentioned the 36 yard zero. The folks that shoot a lot usually use a 75 yard zero. Because it keeps the shots in the  flatter part of the 0-300 range . Your within 2 inches or so from 75-200   The point blank range is cool too as long as you want to kill pie plates, wich is very handy in most cases.
« Last Edit: July 19, 2015, 07:31:10 PM by repo » Logged
saddleup
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« Reply #13 on: July 18, 2015, 07:51:23 PM »


I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.
Actually, when the bullet crosses POA it will be high until gravity overcomes the bullets energy and it will cross POA a 2nd time as it drops


Sent from my iPad using Tapatalk
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Prominus
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« Reply #14 on: July 18, 2015, 08:41:08 PM »


I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.
Actually, when the bullet crosses POA it will be high until gravity overcomes the bullets energy and it will cross POA a 2nd time as it drops


Sent from my iPad using Tapatalk
No the 100 yard zero is magic Wink

and technically you are right but its so small and so short with this zero its not worth noting.
« Last Edit: July 18, 2015, 08:44:44 PM by Prominus » Logged
AZ2000
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« Reply #15 on: July 18, 2015, 08:59:36 PM »

Irons set @ 100 yds, Aimpoint red dot set @ 35yds. On mine, red dot is approximately 4" hi @ 10yds, (aim for the head hit the chest) and spot on @ 300yds, roughly 3.5" low @ 400yds. Anything beyond that and the .308 comes out. Irons are MagPul, mounted on Gear Heads full length rail with a quick disconnect mount for the Aimpoint. Solid as a rock. If I was to shoot competition the red dot would be sighted for 100yds. Like anything else, it's what works best for you.

 2 cents
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PattonWasRight
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« Reply #16 on: July 19, 2015, 11:41:00 AM »

That calculator is great.

I set up to be 2 inches low at 25 yards, which puts me only quarter inch high at 100 yards, and dead on at 200. That seemed a decent all around set up to me.
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« Reply #17 on: July 20, 2015, 11:33:49 AM »

I always zero  @ 100 yards... It just makes everything easier. I am a couple inches low at 25 yards, which I prefer.

The Mepro RDS manual states to zero @ 50 yards and you will be inline for 250 yards.
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saddleup
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« Reply #18 on: July 20, 2015, 11:33:50 AM »


I use 100 yard zero for any firearm I have chambered in 5.56 This is because no matter what you can only be low. You are low before 100 right on at 100 and low again after 100.

Also in a combat situation low misses are always better than high misses.

Another versatile zero is 25m/300m

I always zero my irons at 25m.
Actually, when the bullet crosses POA it will be high until gravity overcomes the bullets energy and it will cross POA a 2nd time as it drops


Sent from my iPad using Tapatalk
No the 100 yard zero is magic Wink

and technically you are right but its so small and so short with this zero its not worth noting.

I agree with you on 100 yard set up. There are so many variations in what we shoot (unless you reload) that worrying over an inch here or there is futile.
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Prominus
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« Reply #19 on: July 20, 2015, 11:09:59 PM »

What also helps me is I write down the ballistic of my rifle (always use xm193)

So I will zero at 100 and shoot a good 20-30 rounds at all different differences and annotate on a card I keep with the rifle (in tavor buttstock in this case) my drops at different distance. Usually I do 25,50,100,200,300,400,450,500. At about 500 you are aiming a body high.
« Last Edit: July 20, 2015, 11:13:02 PM by Prominus » Logged
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