That is kind of hard to do with AL,s,slides,and levers.That is where lasers are great.In most cases you can set a target at 25yds,sight in dead on and usually come out 1.5" to 3" high at 100yds and close to dead on at 200yds.I don't use much more ammo doing it at 25yds than any other way. (I usually center the crosshairs which is usually turning the adjustment all the way up or down and backing off about 3 1/2 turns. (on both windage and elevation) ,,,sam.i do exactly what the first 2 replies said. put it in a stable position/mount, take the bolt out and look down the barrel adjusting the rifle so its on the bulls eye. then just adjust the scope so its also on the bullseye and it should be right on. i did the with my 22lr and it was only an inch off at 50 yards. from there you can easily get it sighted in perfectly.
Good point.A lot of shooters never set their crosshairs at mechanical zero.
Oops....there's some guns you can't use a dental mirror on. I forgot about pistols with locking lugs atop the breech end to lock the barrel "up" from its open-slide position.some guns dont allow you to boresight through the barrel, tex
Yeah but it really doesn't malke much difference when I just want to get on paper at 25yds.Just turn it half way between up and down and left and right and it works.This isn't an article or a long drawn out deal to get things perfect.I just want a bullet in a piece of paper so I know where to adjust to.MZ doesn't work the best anyway because when mounted on a gun using imperfect holes in a receiver to bolt imperfect bases on and then fasten imperfect rings to that have an imperfect scope fastened in them leaves MZ very questionable.I think it is great if you want to set up with MZ,whatever melts your butter.But for me,it is about ten times as fast for me to get one bullet on paper at 25yds,meisure,adjust to zero,and then go for 100yds.Of course,I am a simple man that believes in KISS. ,,,sam.Good point.
Most shooters don't know what mechanical zero is. And it's typically not half way between the limits of the adjustments.
A scope's mechanical zero is when the reticule's center is on the axis of the scope tube. Most scopes have more adjustment range from that point to one limit than the other in both elevation and windage. There's usually more clicks from mechanical zero to the direction the adjustment knobs are backed out away from the scope; usually up in elevation and right in windage. That's because the erector tube inside the scope moved by the adjustments stops against the scope tube before the adjustment reaches its outward travel limits.
To put the reticule adjustments at mechanical zero, lay the scope in two solid-mounted V-blocks; one at each end of the tube. One block just behind the objective bell and the other right in front of the zoom ring or eye piece lock ring is good. Look through the scope, rotate (turn, spin?) it then watch the reticule make a circle about some point. Move the adjustments so the reticule stays at one point all the time as the scope is rotated.
Once that's done, the scope's adjustments are set to mechanical zero. The scope's optical and adjustment axes are now aligned at the center of the tube. When the scope's mounted in rings on the rifle you can find out what the misalignment is between the barrel/bore axis to the scope's axis. Just set the rifle up with the scope's reticule aligned on something and see if the bore's aligned with it. Count the clicks on each knob as you adjust the scope to "bore sight" then write them down.
It's interesting to see what the difference is across several rifles. Some folks almost fall out of their socks when they see how much misalignment there is.
Here's a link to an excellent article on this. Print it out for future reference.
True, but when the scope's at MZ and mounted on a rifle, then boresighted, it shows folks how far it might need to be shimmed in its mounting so maximum adjustment range is available in the field; especially in elevation. Otherwise with the scope sighted in and adjusted for RZ (range zero) at some distance and an extreme adjustment's desired, it may not be attained.MZ doesn't work the best anyway because when mounted on a gun using imperfect holes in a receiver to bolt imperfect bases on and then fasten imperfect rings to that have an imperfect scope fastened in them leaves MZ very questionable.