sighting in a rifle

boltaction

Hey guys got a question I can't seem to remember if you sight a rifle in at 25 ydr's will it be dead on at 100 ydr's. Or is sighting in at 25 yrd's just to put you on the target. thank's

iwannausername

All depends on the load and gun, but on paper at 25 yards should mean that you can be on paper at 100....

guntech59

It should get you on paper but it will be several inches high.

JustC

you should shoot at 100yds

gsmyth64

As our sight in range is currently only 25yds, I'm often asked to run the sight in calculations on the ballistics computer. With just about anu modern scope/gun/cartrige combo, an inch or so low or high gives a hundred yard zero, and the bullets path is within a few inshes the whole time anyway.

sandwarrior

boltaction,

You sight in at 25 yds to get on paper and have an idea where you are at. You then figure out your load. Normally sighted in/zeroed at 25 yds with a scoped rifle will put you high at 100 yds. If you don't have a chronograph you can then figure the velocity with a ballistic calculator such as JBM: http://www.eskimo.com/~jbm/calculations/traj/traj.html

Figure out where you hit at 25, 100 and 200 or 300 Using the bullet you are shooting you should be able to figure an approximate velocity.

With a good boresighting you would normally be able to get on paper @ 100 yds. Too many times though I've had a store clerk who didn't understand what it takes to properly boresight a rifle. Another reason to start at 25 yds. is to verify accuracy. Your accuracy. The rifle will shoot 1 inch or less even if it is a 4 MOA shooter.

Hope that helps, -good luck

EDIT:

Varian,

I didn't continue my thought there that once you know where your at from 25 yds. You move to the range at which you wish to zero. this process just helps you keep track of where you are at with your POI during the sight-in process.

Jdprice jr,

Click that link I have up above and see what it would take to get that trajectory. Since he was an old-timer maybe go without a scope ...sight height of .5" instead of 1.5"

carolinashooter

It should put you on paper. There is no hard and fast rule here because of several variables. Velocity and height of your line-of-sight (iron sights, think AR15 or height of your scope above the bore) are but 2 variables that will make a big difference from one weapon to another.

varian

i believe you should always "sight in" at the ranges you intend to shoot. i have tried many different ways but this always works.

JdpriceJr

I once had an older man tell me that with a .270 130 grain bullet you could sight 1 inch high at 25 yrds at 200 yrds it would be about 1/2 inch low dont know how true that is i always sight mine in at 150 yrds

He Dog

I sight in at 25 yards the push the target out to 100. I sight in 2.5" high at 100 yards with most every thing (centerfire) I shoot. That will put me dead on out to about 200-225 depending upon the cartridge. I don't shoot at animals beyond 250 yards.

11b6r

As the man said- depends on the rifle. Slow vs fast bullet, low iron sights, scoped, or AR type VERY high sights. All will make a difference on bullet path compared to line-of-sight. So, whatcha got?