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Developing my dope...?

27K views 11 replies 6 participants last post by  Mangudai87  
#1 ·
I am new to long distance precision shooting. I have a rifle in .308 and a scope and have zeroed in a 100 yards. The long distance range where I shoot goes out to about 650 yards. I want to start shooting at longer distances.

I understand that going from 100 yards to 200 yards to 300 yards, etc. requires me to adjust the scope's elevation to compensate for the bullet's drop. I also understand that once I've figured out how many clicks of elevation I need from my 100 yard zero to reach each distance, I can make a write down those numbers and keep them for future reference (i.e. dope). The same goes for windage when the wind is blowing.

However, how does one actually go about figuring out how much elevation is needed at each distance? Do I simple put a target at 200 yards elevate the point of aim by 10 clicks and see if I am on the paper. If not, then raise it another 10 clicks and keep doing this until I get it right? Or, is there a way of knowing about how much elevation I will need at each distance given my rifle, scope and calibre?

Since I am using Federal 168gr Gold Medal Match, would it be reasonable to use the the figures listed in the "Average Range" chart on this website to get me out to 300 yards: http://www.federalpremium.com/products/ ... spx?id=150

Thanks!
 
#2 ·
Your best option is a ballistics program. Exbal, JBM, etc.. With these programs you can best suit your elev- and wind dopes. With most of them you just plug in the numbers (BC, MV, Temp, Rel. Hum., Zero, Type of Round etc) and it gives you your dopes out to whatever ranges you specify. I use Nightforce's Exbal ballistic program. It, as well as others, allows you to print out ballistic cards that have your drops and windage every 25yds or meters.
Just know that the cards will only be as accurate as the numbers you plug in. The more accurate you are with plugging in your BC, MV, Temp, etc.. the more accurate your ballistic card will be.
Hope this helps some.

B
 
#3 ·
Thank you Brainz. However, ballistics software is not currently available to me. I do not have a handheld PC (droid, iphone, etc.) heck, I don't even have a laptop.

Edited to ad... ok, I just looked at the NF website and the software you described is not only for handhelds. I guess I could get it for my desk top. Nonetheless, I would still like to know how this was done before the age of computers. I don't want to have to depend on electricity or batteries.
 
#6 ·
Stop thinking in clicks first off. Think MOA or mils depending on what your scope is in. You need 3 NOA then dial to the 3 MOA mark. Don't count 12 clicks.

Here's some basic .308 numbers:
100 zero
200 2 MOA
300 5 MOA
400 8 MOA
500 12 MOA
600 16 MOA

Those should get you on paper. Go to JBM Ballistics page and you get a free ballistics program that works great. It is better if you actually know your velocity so if you have a friend with a chronograph it will be good to use that.
 
#8 ·
Rob01 said:
Stop thinking in clicks first off. Think MOA or mils depending on what your scope is in. You need 3 NOA then dial to the 3 MOA mark. Don't count 12 clicks.

Here's some basic .308 numbers:
100 zero
200 2 MOA
300 5 MOA
400 8 MOA
500 12 MOA
600 16 MOA

Those should get you on paper. Go to JBM Ballistics page and you get a free ballistics program that works great. It is better if you actually know your velocity so if you have a friend with a chronograph it will be good to use that.
Rob,

Thanks. My adjustments will be in milradians but I think I can convert the MOAs. I appreciate the numbers.
 
#12 ·
Rob01 said:
Stop thinking in clicks first off. Think MOA or mils depending on what your scope is in. You need 3 NOA then dial to the 3 MOA mark. Don't count 12 clicks.

Here's some basic .308 numbers:
100 zero
200 2 MOA
300 5 MOA
400 8 MOA
500 12 MOA
600 16 MOA

Those should get you on paper. Go to JBM Ballistics page and you get a free ballistics program that works great. It is better if you actually know your velocity so if you have a friend with a chronograph it will be good to use that.


Definitely works.