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confusion on dialing in range

 
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  #1  
Old 06-28-2008, 05:33 AM
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Location: christchurch, nz
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confusion on dialing in range

hi all im new here and to long range shooting, been reading heaps. i think too much, getting confused. im going to talk in inches because thats what my scope works in. so one inch at 100yrds is 10 inchs at 1000(roughly).so if i move the scope up one inch then will it hit 10 inchs high at 1000?????(if sited in at 100). now lets say that sited in at 100yrds the drop of the bullet is 220inchs at 1000.would i have to move the scope 22inchs or 88 clicks since the scope is in 1/4inchs.
anyway. in going a little crazy thinking about it. help would be great.cheers
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  #2  
Old 06-28-2008, 08:55 AM
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You are headed down the right road. Your scope is probably in MOA (Minutes Of Angle) as opposed to inches of angle. Check on this it should say. If it is in fact MOA then it is 1.047" for every 100 yards. At 1000 yards if you need 220" of correction divide 220" by 10.47" thatis 1 moa at 1000 yards and you get 21.25 MOA ( to the nearest 1/4) forget thinking in clicks. The whole numbers on your scope are MOA go to 21 MOA + 1/4. If you let us know what scope you have this would help. My explanation is based on MOA and it is most likley what you have.
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  #3  
Old 06-28-2008, 01:00 PM
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foreign,
You are correct in your computations, Shawn is trying to make it "easier" for you. Using scope manufactorers data; 1 click = 1/4" @ 100yds, 1.25" @ 500yds and 2.50" @ 1000yds. When sighted in dead on at 100yds and the bullet drops 220" @ 1000yds, divide 220" by 2.50" = 88 clicks.
What Shawn is trying to get you to see (I think) is instead of counting each "click" look at your scopes dial and the value to/from each whole number is 4 clicks or an MOA. An MOA is roughly an inch, more precisely it's 1.047" at 100yds and 10.47" @ 1000yds. So with that in mind divide your drop (220") by what an MOA represents at 1000yds (10.47") and you more precisely get 21.012416 (21 1/4 MOA). If you reset your scopes turret back to "0" after rifle/load was zeroed at 100yds, this would have you go from "0" on your elevation turret to "21" and one more little "click".
Gets you there quicker and more precisely. I learned it the way you did, along time ago and it was hard for me to grasp the MOA version.Hope this all helps. JohnnyK.
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Old 06-28-2008, 05:57 PM
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hey shawn i have a burris fullfield 2. doesnt have turrets.i wont be shooting past 500m any time soon so i thought it un needed. plus all i could afford. stuffs real expensive in nz...so johnnyk now lets say theres a target at 500yrds and drop for that is 50inchs. you would divide 50/1.25=40 clicks or 10 inchs worth on my scope sited in at 100. then in MOA. so 50/5.235=9.55109. so 9.6 MOA. so up to 9 then 2 more clicks (.25moa per click).. that right???if target was at 255yrds then i would go 1.047*2.55=2.66985 MOA. then drop is 7 inchs lets say so 7/2.66985=2.621870143. so 2.6moa adjustment to be zeroed at 255yrds?
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Old 06-28-2008, 06:02 PM
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can all this be done using meters for the calculations. and are there any ballistic calculators on the net which i could down load for free that would give me corrections in moa and inchs
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  #6  
Old 06-28-2008, 08:00 PM
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Here's Two:

JBM - Calculations - Trajectory It's mostly based on Robert L. McCoy formulas. He was a US Army's ballistician and researcher for 30 years. While this is free, it's web-based so if you're not connected you can't use it. You can make printable trajectory card with it though.


Here's another free one that runs on ti-83/84/89 calculators. It's based on Art Pejsa's formula's.Killzone
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  #7  
Old 07-03-2008, 10:02 PM
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so once i have a balistic calculator to find the drop then i have to work out the corrections to dial in my scope. whether in inchs or moa. depending on the scope. eg. .223 drop at 500 yrds. 55.35 inchs. so in moa. 5*1.047=5.235. 55.35/5.235=10.506moa adjustment if sighted in at 100. is that right anyone. and in inchs just use 1 instead of 1.047 but it will be less accurate and compounded over distance.
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