30-06 sight-in.....

longhunter

OK,shooting 180 sp in it,got the scope on,can finally hit center at about 25 yds.(was WAY off),where to go from here?I mean a neighbor says that as it is on at 25 it'll be high at someplce,then back on somewhere...help???L.H.

n/a

I know that I will be told that I am wrong, but contrary to belief, a bullet does not rise then fall, it falls period. Check ballistic charts, there are no + readings only 0, then - if ya dial in at 100 your reticle if ist not just a cross hair, should have a pointer above and below and left and right of the center cross hair, these are compensators for distance and windage. Cant really ecplain it but look at a scope that has a 30-30 reticle, then ya can see what I mean..



"A wise man is a man that realizes just how little he knows"
BIG DOG

bsally

Classic is correct. A bullet only drops. I sight in mine at 100 yards which puts me at about 3 inches low at 200 yards. Using 150 grain ballistic tip. Winchester lists it's 180grain SP about 4 inches low at 200 zeroed at 100 yards. Hope that helps.

SALLY
Committee member-Ducks Unlimited

dheffley

Guy's, it depends on how high the scope it above the receiver. The direct line of the bore, and the direct line of the scope are not paralell and will cause the bullet to "appear" to climb through that line of sight then drop back through it, although that's not really what happens. What it really is, is the line of sight intersecting the bullet "arc" at two points. The higher the scope is mounted from the reciever, the more effect this will have.

Looks like this


Measure twice, cut once.

Empty the clip!

Kdub

Your line of sight with a scope is NORMALLY 1.5" above center of bore. That means if you sight in at 25 yds with the 30-06 using 180 gr bullets and hit dead center on the target, the bore is slightly elevated to intersect the line of sight at that distance. Yes, the bullet crosses the line of sight at this point, arcs upward slightly, then will cross the same line of sight at a distance further out as gravity takes effect. Again, NORMALLY, the 180 gr bullet out of the 30-06 will be approx. 2" - 3" high from center of target at 100 yds with the 25 yd zero. Should strike zero again somewhere around 225 - 250 yds.

If you held the firearm perfectly level and fired the bullet, the bullet starts dropping immediately upon leaving the muzzle. That's why ballistic tables show the drop figures immediately lowering from the muzzle on down range. They do not compensate for the height of scope, or even iron sights above center of bore.

Keep off the Ridgeline

pickenup

At 25 yards make it hit about 2 1/2" low, then go for 100 yards.

The gene pool needs chlorine.

pabooger

Now that you have it close, sight it in at range your going to do the most shooting at.
If it's a hundred yards zero it at 100 yds, then shoot it at 50 yds and record where it hits, do the same at 200, 300, and 400 yds.
Write them down on a small piece of paper and attach it to the gun somewhere, then you will be able to refer to them if the need arises.
Remember that you scope adjusts in increments, usually 1/4 inch per click at hundred yards. So if you are sighting it in at a different range, you may have to move it more or less clicks to get it adjusted.



To Ride, shoot straight,and speak the truth
This was the Ancient law of Youth
Old times are past, old times are done:
But the Law runs true, O little son!

shooter4

To understand this, think of this (I hope I explain it so that anyone can understand it).

Let's say the sight (scope, iron, dots, whatever) are mounted on the gun and the sight is parallel with the barrel. Let's also assume that the sight is centered left, right, up and down and is aligned perfectly with the parallel line of the bore.

Let's say the center of the sight is mounted 1.5" above the barrel.

When you look through the sight you are aligning the sight with the target, not the barrel.

If you place the muzzle of the gun against the center of the target, the sight will be sighted in at 1.5" ABOVE the center of the target.

Now, that doesn't change as you back up from the target.

Think of holding 2 long, straight sticks. To make them touch at the end, you must angle them towards each other a little.

So when you sight in the gun (let's say at 100 yards), you actually adjust the sight so that they are aligning up lower than parallel with the barrel so that the line from the barrel and the line from the sight intersect (come together) at the center of the target at 100 yards.

I should note that the bore and sight are not actually intersecting. As stated in other posts, the bullet begins to drop (gravity) as soon as it leaves the barrel.

I should also note that as a bullet travels down a barrel, the barrel actually vibrates in a circular motion a little and it may actually be pointing a little up or down or left or right or any angle in between.

So you are not actually aligning the bore and sight, you are aligning the sight and the point of impact of the bullet at the specific distance that you are sighting in at. The further away you get, the more the bullet drops from gravity and the more OFF the point of intersect is because of the angle at the new distance.

The weight of the bullet, the velocity and other factors will also affect the point of impact.