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Posted: 3/12/2006 6:07:52 PM EDT
[#1]
The only downside I can see is that wind and distance might have a bigger effect on shifting your grouping at 100 yards than at 50 or 25. If you are shooting in a hurricane vs. a windless day, it isn't going to matter a few feet in front of the muzzle, but it will matter a lot at 100 yards. The longer the bullet is in the air, the more chance wind has to push it to one side. I suppose it could also be argued that a bigger grouping will technically be slightly less definitive than a smaller grouping when used to determine your zero, though this wouldn't be a big effect. I think 100 yards is probably a more realistic range for hunting/practical purposes anyways. |
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Posted: 3/12/2006 6:10:43 PM EDT
[#2]
Sighting in at closer ranges isn't all that great if you have too or want too shoot at longer distances, like 300 meters. Acog sight in distance is 100 meters or 100 yards. That's standard, then it's graduated from there. Irons, I always do it the Army way. Sight in at 25 meters, it should be dead on at 300 meters. If I am shooting at 100 meters, I aim 5 inches low. Direct hit. At 200 meters, I aim about 3 1/2 inches low, direct hit. If you are going for accuracy or are too lazy to know your trajectory, then sight in at a know distance where you'll be doing most of your shooting. If you are battle sighting on a AR, then sight in at 25 meters or 25 yards and you'll be able to hit just about anything out to 300 meters or 300 yards, as long as you know your trajectory. |
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Posted: 3/14/2006 5:47:04 AM EDT
[#3]
It is not lazy, it is Newbie.
Reading as much as I can after starting with ARs and the disease took hold. Now have 8/3 and 6/3 markings on carry handles, AGOG, BUIS = overload for trying to put it all reading(twist, grain, height from muzzle, velocity, 25 meters vs yards, which target, etc.) material together and looking for some help from hands on experienced shooters. Using Walmart WWB 40rnd packs, xm 193, m855. Been going to indoor range and now about to get to outdoor. |
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Posted: 3/14/2006 5:55:39 AM EDT
[#4]
Depends on what you are shooting, and, what you plan to shoot at.
for CQB, 25M is fine.....It's what the Army teaches...Or did when I was in. I personally zero at 100m. The ballistics of .223 are very similar at 100 and, 300m, AFA where the round is going to strike. If you sight at 25m you are going to have to aim a little high at 300m, and, a little low at closer ranges. |
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Posted: 3/14/2006 6:00:23 AM EDT
[#5]
Didn't the Book Of Two Guns guy Tiger McKee suggest sighting in at 75yards because of bullet drop? I thought that was intriguing but haven't done it yet.
IMHO the 5.56s get sighted in at 25yards (except the new one, it's gonna get sighted at 100) and the 7.62s at 100. That's how I roll. 
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Posted: 3/14/2006 6:03:31 AM EDT
[#6]
That 25 yard nonsense is for the birds! Too much margin for error. 100 yards is a rock solid, no nonsense ZERO!
w00t! and good night! |
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Posted: 3/14/2006 6:20:45 AM EDT
[#7]
Your best bet would be to zero at 200 yards. This would give you a trajectory where the point of impact is never more than 2 inches above or below the point of aim from about 10 yards to 240 yards. In other words, aim where you want to hit at any distance between 10 and 240 yards, and you will not be high or low by more than 2 inches (assuming a 2.6 inch sight height above the bore - standard for an AR type weapon, M193 ammo, and a 20" barrel). This makes range estimation far less important.
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Posted: 3/14/2006 7:50:24 AM EDT
[#8]
Thanks for the info as it is starting to make sense and maybe
16in barrels Shooting indoors at 25 yards with ACOG/sandbags, IDPA target, aiming at center of head is hitting "throat" within dime sizee hits. Will measure distance next time. No Iron or BUIS use yet. |
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Posted: 3/14/2006 7:54:34 AM EDT
[#9]
I thought 87 Yards was optimal? |
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Posted: 3/14/2006 7:55:10 AM EDT
[#10]
Sighting in and setting the zero are not the same thing.
You should sight in at 100 yards, at least. You can set the zero by adjusting POI vs POA at 100 yards to achieve whatever zero you want. All you need to know is the rise needed at 100 yds to achieve the desired zero range. |
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Posted: 3/14/2006 8:05:32 AM EDT
[#11]
Yeah because the Army and Marines suck at shooting 250yds+ with zeroing at 25yds. 
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Posted: 3/14/2006 8:07:22 AM EDT
[#12]
I didn't have any problems knocking down the 300 y targets after zeroing at 25 y at all. Very strange, that.
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Posted: 3/14/2006 8:07:35 AM EDT
[#13]
My 16" M4 I prefer the 50 yard sightin less change in trajectory. I am using a TACpoint and buis same point of aim.
On my 20", I have a 3*9 AR-15 colt knockoff sight, it has a knob you turn that adjusts for bullet drop out to 5-hundred yards, however it has to be sighted in at 100-yards, which it is. If it had just iron sights it would be sighted in at 50-yards as well. |
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Posted: 3/14/2006 8:11:13 AM EDT
[#14]
Precisely. What is markm smoking?
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Posted: 3/14/2006 8:16:12 AM EDT
[#15]
. |
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Posted: 3/14/2006 8:16:26 AM EDT
[#16]
He's in a mood today.
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Posted: 3/14/2006 8:27:14 AM EDT
[#17]
The "I'm smoking some good hashish" mood? 
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