wb3jma
Active Member
If you were closer to frederick, you could come to my range and we'd get you straightened out quick. Hope someone close can help you
I have no problem coming to you!!!
If you were closer to frederick, you could come to my range and we'd get you straightened out quick. Hope someone close can help you
You can use a ballistics calculator to determine the offset at 25 yards for any zero range.
I just JBM Ballistics - https://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi
So an AR with a 55 grain bullet at 3000 fps, you would adjust your sights so the bullet hits 1.1 inches low at 25 yards, and the rifle will be zeroed for 100 yards.
If you wanted a 200 yard zero, you would set the sights to hit 0.7" low at 25 yards.
The reason you adjust to hit low at 25 yards is that due to the high sight height on an AR, the bullet is rising from below at short ranges.
Ammo is freaking outrageous right now. It sucks.
I know resetting the sight to zero sounds like a pain but it’s just sort of one of those necessary steps to make sure you are at least starting off close to the center.
I looked up the specs for your optic. If you bore sight the rifle at 25yds like I described then get back to the range I’m pretty sure you will be on the paper at 25yds with your first shot. At 25yds your 2moa dot covers up an 8” diameter circle. So just grab a paper plate and staple it to a tree 25yds from your window.
At the range shoot at a larger say 16”x16” grid target. Aim right for the center and take a shot. If you to your part and have the gun totally steady you should be able to dial in from there. At 25yds each click of the dial will move the bullet impact 2”. So if your first shot was 6” low dial UP 3 clicks. If the shot was 8” to the left, dial right 4 clicks.
Then take another shot. You should be pretty close to center. Iike some posted above take 2 more shots and measure the center of that 3 shot group and make a final adjustment from the center of that 3 shot group.
If you are satisfied with your result at 25yds move the target back to 50yds. Your shots should be a little lower but still on the paper. At 50yds each click will move the point of impact 1”. So if you are 1” low dial up 1 click. Your windage shouldn’t change.
If you are close to center at 50yds move back to 100yds and do it again. Your first shot should again be low. This time at 100 yds each click will move the point of impact 1/2”. So you may beed to dial up 3-4 clicks to get back to the center. At this point I would take my 5 shot group and make my final adjustment from the
center of that 5 shot group.
This procedure should consume between 12-15 rounds.
I have no problem coming to you!!!
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.
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.
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.
An innocent question; is it really this complicated?
At 25yds each click of the dial will move the bullet impact 2”.
Right???Good question Einstein!
I've zeroed alot of guns....havent used a ballistic quotient graph or math yet! :
I ain't that smart.
Right???
(...you are smart! not like everybody says...)
Ouch!!!Well, maybe I'm kinda smart....but I should find smarter friends......
An innocent question; is it really this complicated?
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.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.
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.
Well then please direct me to the solution.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.