MOA setup help

Discussion in 'Long Range Scopes and Other Optics' started by beakus33, Feb 16, 2012.

  1. beakus33

    beakus33 Well-Known Member

    Messages:
    85
    Joined:
    Feb 7, 2012
    ok i think the super sniper scope i have is a 1/4 moa per click. if i understand this correctly,that is 1/4" @ 100yrds per click,1 moa (4 clicks) @100yrds is 1". 1 moa compounds per 100yrds, 2"@200, 3"@300 and so on, correct?so if my walmart ammo drops apx. 48" @ 600 yrds i would crank in 8 moa ccw on my elevation for a first shot? if not please explain or guide me to "scope dope for idiots":D
     
  2. 42769vette

    42769vette Well-Known Member

    Messages:
    383
    Joined:
    Sep 10, 2010
    sounds like you have it
     

  3. SBruce

    SBruce Well-Known Member

    Messages:
    1,786
    Joined:
    Oct 31, 2009
    Basically, in a nut shell.........exactly!:)

    one thing you might discover as you shoot more and at further distance, is that your scope may not be exactly precisely 1/4 minute clicks. Only testing will say for sure.

    One other thing (not to complicate things, but it's reality), if your scope moves the poi 1/4 inch per click it will take 8 "minutes". However, if your scope moves poi 1/4 MOA per click it will take 7.6 minutes (7.5 is as close as we can get with 1/4 moa corrections).

    We have to subtract 5% if it's a true moa scope, because a true MOA is 5% bigger at 100 yds than an inch.........it's 1.0472 inches to be more precise, but 5% is easier to deal with.

    Basically, that's the difference between IPHY (shooters moa) and true Angular MOA..........5%. Using IPHY is quicker and easier and generally gets us close enough untill we start dialing alot of clicks or the distance gets pretty far.
     
  4. beakus33

    beakus33 Well-Known Member

    Messages:
    85
    Joined:
    Feb 7, 2012
    Wooooooooo, slow down, theres to many 3 and 4 letter word flying around that i dont know what they mean. Just want to get the jist of it first then i'll worry about shooting off gnats nuts a little later.thanks for all the help guys.
     
  5. Scot E

    Scot E Well-Known Member

    Messages:
    1,312
    Joined:
    Mar 1, 2008
    What SBruce is saying is good info to keep in mind. None of the formulas and numbers matter much until you figure out how much each click of YOUR turret actually moves your reticle. Don't buy into the lie that turrets adjust per their rated specs. It is not true very often. To be clear, it may not make a difference at closer ranges but as you begin to move further out you will need to know your exact particular click adjustments.

    So:

    1 inch at 100 yards and .25 of an inch per click is close enough and easy to remember when you are getting started. This is considered IPHY (inches per hundred yards)

    True MOA is 1.047 inches which equates to .26 inches per click.

    Again, your scope may be one of these or even something slightly different like .24 or .27 per click. This is why LR shooters must test their click adjustments.

    Scot E.
     
  6. shortpants

    shortpants Well-Known Member

    Messages:
    602
    Joined:
    Jan 26, 2011
    Simple terms is if your shooting at ranges under 600yds then what your doing will work fine. If you plan on shooting further you better read what these guys are telling you and learn to apply it. Everything starts to matter a whole lot more beyond 600. A simple way to remember how to calculate your drops in inches into click adjustments in MOA on your scope is 48"/6=8MOA. So when you range your target at 600 it becomes 6 or a range of 531yds becomes 5.31. Inches divided by range = MOA
     
  7. beakus33

    beakus33 Well-Known Member

    Messages:
    85
    Joined:
    Feb 7, 2012
    Thanks guys I am grate full for all of the help and and info. I know I need to put some rounds down field to get some true numbers I just wanted to make sure I'm on the right track in my thinking.this is an awesome place endless info.
     
  8. SBruce

    SBruce Well-Known Member

    Messages:
    1,786
    Joined:
    Oct 31, 2009
    Not to worry, you're on the right track.

    Over the years, I've known alot of people (that consider themselves hunters or shooters) that don't know how to get what you came up with in your original question. You'd be amazed at the number of people I've seen on public ranges that can't even get their own scope sighted in, simply because they don't understand the basic "1/4 inch per click" and that it grows with distance.

    Best of luck.
     
  9. Mikecr

    Mikecr Well-Known Member

    Messages:
    4,246
    Joined:
    Aug 10, 2003
    Someday we should post a sticky thread listing our determined scope adjustment values by model. If known, particular reticle subtensions could be stated also.
    Could be pretty useful.

    I've only tested MK4 scopes, because it's all I use for hunting, and so far all have actually adjusted true in MOA(1.047).
    I've 'heard' that most other leupolds are IPHY, which is great if known and accurate.
    And I've heard that NF scopes are actually neither at 1.09"..
    Yet all are listed as MOA of adjustment..
     
  10. Eaglet

    Eaglet Well-Known Member

    Messages:
    2,779
    Joined:
    Feb 2, 2005
    Gnats... You're right, who needs to worry about 0.047" difference at 100 yards?
    though the average size of a gnat is about 0.039". :)

    Now,
    1 MOA = 1.047" at 100 yards and 10.47" at 1000 yards
    1 IPHY = 1.000" at 100 yards and 10.00 at 1000 yards

    Up to now, we would still be thinking about the gnats deal... but know instead of
    just making a comparison let's get a real world example.

    Let's say your rifle scope is calibrated in inches, 4 clicks = 1" at 100 yards.
    now from a ballistic table you know your turret needs to go up 23.2 MOA; take
    the shot and the big awesome buck just walks away into the timber.

    What happened? For each 4 clicks you lost 0.049", so... (0.049 X 23.2)=1.137"
    which at 1000 yards would make a difference of 11.37" allowing you to
    miss the buck.

    You needed to come up 24.3 IPHY on your turret instead you came up 23.2 IPHY
    thinking that a gnat makes no difference and you actually missed by 292 gnats! :)

    Written in the spirit of helping with a funny twist but very respectfully!

    Good posts!
     
  11. D.ID

    D.ID Well-Known Member

    Messages:
    838
    Joined:
    Dec 24, 2008
    Good advise............ Verify you adjustments are in fact moa and then forget 1/4" @ 100 x range......it does not add up except for initial zeroing at close range. I only mention it because the compounding problem of discrepancy x 23 had me pulling my hair out a while back.
     
  12. Eaglet

    Eaglet Well-Known Member

    Messages:
    2,779
    Joined:
    Feb 2, 2005
    CORRECTION :rolleyes:

    (0.047X23.2)= 1.090"
    which at 1000 yards would make a difference of 10.90"
    you actually missed by 279 gnats!
     
  13. D.ID

    D.ID Well-Known Member

    Messages:
    838
    Joined:
    Dec 24, 2008
    Personally, I love the fact you can use a gnat as a technical measurement. Well Done.
     
  14. beakus33

    beakus33 Well-Known Member

    Messages:
    85
    Joined:
    Feb 7, 2012
    Ok i keep coming back to the info posted and i cant wrap my brain around it.if 1moa is 1.047 @100, thats 10.47@1000 correct? For quick math on the trigger if u round down to 1.0 moa@100,10.0@1000 correct? My math gives me a differance of .47"@1000, i only wish i could shoot 1/2"groups @1000.( these are texas gnats, .25", only missed be 2 ).