wb3jma
Active Member
I have no problem coming to you!!!
Help dialing in a green dot scope
- Thread starter wb3jma
- Start date
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wb3jma
Active Member
yea that is something I'm worried about as it's calibered in .357 mag so 100 yrds is effective range even in a rifle and Im not sure of what drop might be can't find any reliable data.
wb3jma
Active Member
On the redialing the specs on my Holosun H403BGR say 50 =/- MOA for travel range which would be 100 0.5 clicks form one side to another yet the following URL for a similiar sight said 372 clicks elevation and 348 windage.
https://unnecessarycomplification.wordpress.com/2016/09/28/review-holosun-403gl/
Pm sent
Doco Overboard
Ultimate Member
I like to verify the optical plane of the scope vs center line of the bore against a short range target 10-25 yards to make sure they agree before moving to a gridded target at longer distance.(mechanical zero). By firing more than one shot, gross windage adjustments can easily be made at the same time before the scope dials are even involved. Especially if you have windage adjustable mounts.
Once you get paper at 100 yds and your reasonably close, its easy enough to have an assistant adjust the reticule from target center to point of impact while a steady hold is maintained.
Most, if not a majority of manufacture make drums that usually raise POI or move groups right when making anti clockwise adjustments and clockwise to lower or move groups left. (this may not always be the case check your kit but mostly) Your turning the drums toward yourself and not away so its easier if that's what you happen to have going on.
By knowing this before hand, an assistant isn't always necessary and the action can be taken by the firer alone without too much difficultly in many cases by having to maintain a steady hold, or count clicks- perform the action all at the same time.
By having the majority of windage adjustments complete at short range, it usually a simple matter to target the rifle because less clicks are needed for sighting at a greater distance taking into account the difference in elevation only.
The flatter the trajectory of the cartridge that is being used, the easier it is.
For rifles adapted/designed to fire pistol cartridges, the cartridges are usually more abundant than what is commonly used during sighting so elevation corrections could be more drastic, a greater number of cartridges may need to be fired due to the difference in velocity/efficiency at longer ranges.
The more you do it, the easier it usually becomes with a little practice.
Once you get paper at 100 yds and your reasonably close, its easy enough to have an assistant adjust the reticule from target center to point of impact while a steady hold is maintained.
Most, if not a majority of manufacture make drums that usually raise POI or move groups right when making anti clockwise adjustments and clockwise to lower or move groups left. (this may not always be the case check your kit but mostly) Your turning the drums toward yourself and not away so its easier if that's what you happen to have going on.
By knowing this before hand, an assistant isn't always necessary and the action can be taken by the firer alone without too much difficultly in many cases by having to maintain a steady hold, or count clicks- perform the action all at the same time.
By having the majority of windage adjustments complete at short range, it usually a simple matter to target the rifle because less clicks are needed for sighting at a greater distance taking into account the difference in elevation only.
The flatter the trajectory of the cartridge that is being used, the easier it is.
For rifles adapted/designed to fire pistol cartridges, the cartridges are usually more abundant than what is commonly used during sighting so elevation corrections could be more drastic, a greater number of cartridges may need to be fired due to the difference in velocity/efficiency at longer ranges.
The more you do it, the easier it usually becomes with a little practice.
- Feb 4, 2013
- 28,175
What round?
Manufacturer will tell you what the muzzle velocity should be. You have to figure out the bullet, but that should not be too hard.
Say Hornady 125 grain XTP at 1200 fps. You are looking at 1.5 inches high at 25 yards, for a 100 yard zero.
For a Maximum Point Blank Range zero, you would set for 2.4 inches high at 25 yards. This would give you a +/- of no more than 5 inches from muzzle to 143 yards.
wb3jma
Active Member
Muzzle velocity of .357 mag rounds are typically my the manufacture given at what the average pistol is. There is some data supporting 1700-1800 fps typically 158 grns) for an 18 in barrel(mine is 18.5) but nothing telling me what you just told me for a .357 mag.
- Feb 4, 2013
- 28,175
Sorry, I was basing it off a pistol MV.
For 1750 FPS:
Say Hornady 125 grain XTP at 1200 fps. You are looking at 0.1 inches high at 25 yards, for a 100 yard zero.
For a Maximum Point Blank Range zero, you would set for 1.4 inches high at 25 yards. This would give you a +/- of no more than 5 inches from muzzle to 186 yards.
- Jul 29, 2014
- 49,963
An innocent question; is it really this complicated?
Good question Einstein!
I've zeroed alot of guns....havent used a ballistic quotient graph or math yet! :
I ain't that smart.
Tungsten
Ultimate Member
That is one hell of a click.
1MOA click only moves POI by 1/4" at 25 yards (0.5MOA click moves it by 1/8" at 25yd). I've never heard of a 8 MOA click.
- Jul 29, 2014
- 49,963
Right???Good question Einstein!
I've zeroed alot of guns....havent used a ballistic quotient graph or math yet! :
I ain't that smart.
(...you are smart! not like everybody says...)
Right???
(...you are smart! not like everybody says...)
Well, maybe I'm kinda smart....but I should find smarter friends......
- Jul 29, 2014
- 49,963
Ouch!!!
wb3jma
Active Member
Thanks for speed3 for inviting me out to his local out door range to give me hand despite not knowing the difference for now change a 0.5 moa click makes at 25 and 100 yrds. The green dot scope is confusing in another manner. Clockwise adjustments do move the dot in the scope up an right for elevation and windage but when readjusting your physical aim to recenter in the sled it has the opposite affect.
Last edited:
- Feb 4, 2013
- 28,175
What makes it more complicated is OP stated only a 25 yard range, but wanted to zero for further out.
If you want to zero at 100 yards, and you have a 100 yard range to use, it is very easy.
Max Point Blank Range is harder, as the zero yardage is always some odd number of yards.
- Jul 29, 2014
- 49,963
Buuut, given that, it's all still theoretical, at this point. No matter the theorem applied, he still needs real world application to confirm his settings. He can't get that off the interweb.
It's not that complicated. If you want to zero at 100 yards, you need to shoot from 100 yards. he needs to find someplace in which to do that.
wb3jma
Active Member
Err that's already happened if you look a couple posts up. Never ceases to amaze how a thread takes on a life of it's own and gets spun away.
I have a 100 yard zero target, but you shoot at 25 yards... with a box about 2 inches from point of aim....works excellent, and my zeros are right on...anyone wants one pm me and I'll email it to you
- Jul 29, 2014
- 49,963
Well then please direct me to the solution.
I've never sighted in a green dot before. Evidently, they are way more complex than red dots.
I'm having a hard time following your actual problem. People shouting out numbers of clicks, failing the math, etc.
Since this is not an open bore rifle, you need to get a couple feet from the target and shoot it from a steady rest. If you can't manage a group from there(and then adjust), either throw the sight away or throw the rifle away. One of them is focked.
If you think the problem might be the sight, dial the sigh's vertical and horrizontal all the way in one direction until they stop. Now, dial each one in the opposite direction until they stop, counting the revolutions. If it takes 10 revolutions from one stop to the other, dial back five revolutions. This will give you a 'factory' center of the sight. Do this with vertical and horizontal, then shoot a target at about 10 yards aiming at the bull's eye. This should tell you which way to adjust fire.
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