Scope reticle question

[handirifle]

I have a 4X scope on my Savage 30-06.  It has dual reticle and using a 165gr load it is about 2" high at 100yds, but using the pointed top of the bottom post is is dead on at 600yds.  Once I discovered this I went 4 for 4 at 600yds on an 18" steel plate out there.

The question is, if I look at the spacing between the crosshair and the top of this bottom post and determine how far apart they are at 100yds, is it just a matter of times 6 at 600?

In otherwords, If there is a 6" gap at 100 will it 36" at 600 or is it 6x6x6x6 etc....?

[Chuck White]

handirifle
Some of the reticles in scopes are referred to by several different names!

One name is "30-30 RETICLE"!
If I remember correctly, there is supposed to be a distance of 30 inches at 100 yards, between the points of the coarse part of the crosshairs!

Hope this is what you were looking for!

[handirifle]

No not really what I was wondering.  I can figure the distance from the cross to the post at 100yds, is it that number times 6 at 600yds?

[klong]

I do not understand your question. If you are talking about holding over the target at 600 yards by 36 inches, the answer is no that will not work with any hunting caliber I know. Nor can you come half way to the top of the post and be on at 350yds. The standard drop for a 308 winchester with the 168 grain matchking is around 90 inches from 100 to 600yds.

[handirifle]

I have a 4X scope on my Savage 30-06. It has dual reticle and using a 165gr load it is about 2" high at 100yds, but using the pointed top of the bottom post is is dead on at 600yds. Once I discovered this I went 4 for 4 at 600yds on an 18" steel plate out there.

From my first post.  WHATEVER the amount I am holding over is, WORKS!

My question is, is there an accurate way to determine HOW MUCH I AM holding over.   If by looking at this picture I am aiming at 100yds.  IF, for example only, (the 36" was an EXAMPLE ONLY number) the distance from the top of the BOTTOM post (where the bottom post turns into the fine verticle croswire) that measurement is "D" and the distance is known (100yds="Y") then would the formula to determine the amount I am holding over at 600yds be D x 6?  




I already KNOW that when I hold the top part of the bottom post dead center of an 18" plate at 600yds, I hit the plate dead center.  NOW if I know the distance from the post top to the crosshair intersection, at 100yds, (measured by looking at a scaled target) is the number "D", then do I just multiply "D" times the multiple of hundred yards (in this case "6") to determine the amount the bullet is dropping?

[Slamfire]

Get a standard 6" bull, looking at it at various ranges you can determine the range at which the fine crosshairs are fully covered by the bull, but the course wires just touch the edges. If that is 100 yards then the duples is a 6 minute of angle sice, at 200 yards it subetneds 12 minutes of angle. 300 yards = 18 minutes and so on. Half of this is the distance between the bottom post and the center of the crosshair.  :wink:

[Larry Gibson]

No not really what I was wondering.  I can figure the distance from the cross to the post at 100yds, is it that number times 6 at 600yds?

Yes.

Larry Gibson

[klong]

Theoretically,yes. If you put a tape to it at 100 yards when you put the post on the center of your target your cross hairs should be between 15 and 20 inches higher than the center of your target ,depending upon the caliber you are shooting. This should work because you already know that at 600 yards the post is on target and because you have this all at the same power magnification.

[Ramrod]

It will most definately be 36 inches at 600 yards. If the distance from the post to the crosshairs subtends 6 inches at 100 yards, it will be 12 inches at 200, 18 inches at 300, etc. The angle can not be changed by the range, in this case aproximately six minutes, and the height is proportional at any given range.

[Eddie in Delta]

Good ol' geometry.  The easy way to do this is use the law of tangents.  Maybe I learned something in high school after all.

Eddie

[Mikey]

handirifle - the information that came with your scope, or hopefully information you can obtain from the manufacturer about your scope, should tell you what the distance is between crosshair and post at 100 yds.  I use the same technique with a 22 and a 4x scope.  The rifle is sighted in an inch or so high at 50 yds but I can make hits out to 125 yds using the top of the bottom post as an aiming point.  Same idea just shorter distances.  

Also, you can determine what the holdover is if you take aim at 100 yds with the post and see how high she hits.  Keep in mind that at 600 yds impact distance your mid-point trajectory will be at 300 yds, so at 100 yds your bullet is still climbing.  If you can post a target at 300 yds and use the post as an aiming point that will tell you what your mid-range trajectory is in inches.  With your 06 currently sighted 2" high at 100 yds your crosshairs are good to 300 yds.  Using your post from that distance onward you should be able to determine your holdover or poi at 400 - 60 yds.   HTH.  Mikey.

[handirifle]

Alright, that was what I was wondering.  I figure it can be my rangefinder too.  I have a laser one but nothing is as fast as looking through the scope.

Mikey,
This scope was old when I got it used so??  Am also aware of the TRUE bullet path is not what the eye sees.

Now I can determine how far my bullet drops from "point of aim" as various ranges as well.  This will give me something to play with at the range and see how close my estimations are.

Thanks to all.  That is one reason I like a fixed power scope.  Less confusion.