Come ups and come downs

Boyd Heaton

Well-Known Member
Joined
May 14, 2001
Messages
1,071
Location
Lock Haven P.A.
You first have to tell us the Velocity,bullet weight,b.c. of the bullet and altitude you are at.And we can get you in the ballpark....
 

wesley85

New Member
Joined
Apr 6, 2002
Messages
3
Im sorry about that i totally forgot. Im shooting a Sierra 168 gr. BTHP.

thanks
 

wesley85

New Member
Joined
Apr 6, 2002
Messages
3
Howdy, I was wondering if someone could help me out a little. I have a rem model 700 sendero chambered in a 7mm Mag. I was wondering if someone could give me the data for comeups and comedowns for my scope. the ranges i need are 100 yds through 1000yards. And if you have the data for a 10mph wind to 30 mph ill be mighty obliged.

thanks
 

Dave King

Well-Known Member
Joined
May 3, 2001
Messages
2,366
Wesley85

The info you're asking for is not available to us (in exact terms), you need at a minimun the velocity, bullet Ballistic Coefficient (BC), ambient temperature and elevation. With this info we can give you a computer approximation which you will need to verify at the actual ranges desired.

Here's a thread that covers this sort of thing.
http://www.longrangehunting.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=10&t=000004

If you don't have a chronograph you can still get come-up data from actual firing.

First zero the rifle to hit Point Of Aim (POA) equals Point Of Impact (POI) at 100 yards.

Now, (use these numbers as an initial go-by) adjust the scope UP 1 minute (4 "clicks on a 1/4 MOA scope). and shoot at the 200 yard target. Record the distance above or below the EXACT POA that the bullets (group) strike the target. Adjust the initial 1 minute elevation by 1/2 the error distance (if the bullet hits high then SUBTRACT 1/2 the error amount from the 1 minute and if the bullets hit low ADD 1/2 this value to the 1 minute).

Now that you have data for 200 yards, ADD 2 minutes of elevation ON TOP of the 200 yard adjustment. this should get you very close for 300 yards. Shoot a group and measure the error either high or low and divide by 3 for the necessary ADJUSTMENT to the current scope settings. If the scope is set on 3 minutes (inches) up and the bullets are hitting 1.5 inches high at 300 yards then take .5 minutes off the elevation setting.

For 400 yards ADD 2 minutes to the 300 yard data and repeat the verification process but divide by 4 for the correction value.

For 500 yards ADD 2 more minutes and verify and correct (divide by 5).

For 600 yards ADD another 2 minutes.

For 700 ADD another 3 minutes.

For 800 yards ADD 3 minutes.

For 900 ADD 3.

For 1000 ADD another 3.

These values when added to the previous corrected value should keep you close enough to get good data.

(These are just best guess data on my part, I didn't use a computer program but grabbed numbers from 308 come-up data and took a percentage.)
 

wesley85

New Member
Joined
Apr 6, 2002
Messages
3
Hey i appreciate the information. Ill try it when i go to the range.
thanks
 

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1


Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More


Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen


Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More


The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz


Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More

NightForce


Top