Scope formula

I sight in a newly scoped rifle exactly the way Peetzakilla explained, Cowboy Mo the impact is different, maybe not much, but different. I have also done exactly what Art does sighting first thing at 25 dead center then moving out to fifty or so. Ultimately nobody drinks their beer the same as me, so OP it's up to you to try yourself a sure-fire way to sight in that YOUR'E comfortable with,,,,,, Oh and by the way if you only sight in at 25 yds, don't hunt around me please!!!;) We could all go on all day about what zeroe this ,what zeroe that, BUT WHEN IT ALL COMES DOWN TO IT, MAKE DAMN SURE YOU CAN HIT WHAT YOUR'E AIMING AT, OR STAY AT HOME!!!!!!(that's rule Number One at my camp!!!!)
 
Shell said:
The kids and i went out with the neighbor in north dakota to sight in the rifles for hunting & he told me a scope formula for distance, like 25 yds same in the scope as 100 yds, but adjust 1/4 inch for 50 yds and 1/2 @ 75, or something to that effect. does anyone know the exact formula?
Click to expand...

It's not a "formula", it's a "rule of thumb" and it's not really accurate. A 30-06 with a first zero at 25 yards will have a second zero at about 200 yards. A 30-30 with a first zero at 25 yards will have about a 140 yard second zero. A .22 standard velocity long rifle with a first zero at 18 yards will have a second zero at 50 yards.
This all assumes a scope that's 1.5 inches above the bore line.

Sighting in at 25 yards can be useful when mounting a new scope. Get it perfect zero at 25 yards and then you can go to 100 or 200 yards for the final fine tuning.
 
I am with most of the crowd: get started with Mr. Eatman's rule of thumb or results from ballistics software as a jumping off point, then test, test, test your rifle, sights, and ammo combination at the ranges you will be shooting. I am chiming in to repeat my recommendation of the Norma ballistics program, which operates with sliders for various values and is very quick to make changes. There is a lot of play value there, as well. You will need the ballistic coefficient and muzzle velocity for your specific load.
 
I like to keep things simple. I use 25 yards because the bullet holes are easy to see and it saves walking an extra 25 yards to set up or remove the target and when taping bullet holes. That has always had me on paper at 100 yards, and usually fairly close to the center of the target.

I sight in via 3-shot groups that get me to two inches high at 100 yards because that has worked okay for me for sixty years. By "worked" I mean that I have always been able to reliably hit what I intended to hit, from up-close on out to Ma Bell territory.

If I have any advice as such, it's to not over-think what is IMO a simple process. Picking fly poop out of pepper is not what I'd call a reasonable career choice.

Anyhow, that's the "why" of what I do. :)
 
You must log in or register to reply here.
Back
Top