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Advice Newbies guide to Zeroing a scope at short range for long range use.

Discussion in 'Anything Airgun Related' started by SteveB, Jun 24, 2012.

  1. SteveB

    SteveB Busy Member

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    Location:
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    This Method works on ALL scopes and ALL Calibres from .177 to .50 Cal Sniper Rifles and is common practice in the military and Full Bore Clubs!
    OK........ so you want to hunt bunnies at 35 yards with your rifle, but your garden is only 20 yards long and you want to zero your scope. Without actually doing it in the field.
    Before you start knocking holes in the back garden fence, or shooting inside from your front door through the hall and kitchen, with the back door open, to get that extra distance,(I have seen it happen!!!) it can be done another less hazardous way!!!!!
    In fact I use this method EVERY TIME I first fit a scope to a rifle. "WHY" you may ask? All right...., I will tell you!
    when you fit a scope for the first time, you don't know where it is pointing until you fire your first pellet. If it is way out, and your target is 35 yards away it could miss the target completely and you will not have a clue by how far it missed (unless the cat keels over or you hear the pellet hitting something it shouldn't!), so it is trial and error till you hit the target. BUT if you move your target closer, the angle of the pellet leaving the barrel, in relation to the scope is the same, but the pellet distance from centre is a lot less, so you will 9 times out of ten be somewhere on the target! Whether it be in the vertical or horizontal plane......Does that make sense?...No? Time for a piccie.....
    unzerod scope.jpg

    Don't complicate things with trajectory etc yet.... just take my word for it, this is the theory.
    OK...... so you want to zero at 35 yards in your postage stamp sized garden. (assuming neighbours don't mind Blah...Blah...)
    First thing... as responsible air gunners we ALL chrono our guns, don't we? You don't?.... Shame on you!!!
    I chrono mine with several types of pellets, and different weights and I keep them on a spread sheet for ALL my guns. (sad I know, but I do!). You need a copy of Chair Gun, input all your data, and set your selected zero. ( before I get stick for using Chair Gun, I use it as a guide, or play with it while Eastenders is on, or so I can say I am busy when the wife finds a chore for me to do!)
    Chair Gun shows you a pretty picture of your pellet path and what's that I see? The pellet path crosses the centre line in two places! Try resetting it for 14 yard zero and see what happens!
    Don't believe me? OK...... time for another piccie...........
    chair gun zero.jpg
    This is the settings for my Brocock .177, zeroed at 35 yards. I picked this distance because, as you see, my pellet strikes in the one inch (girlie pink for a girlie calibre) kill zone from about 10 yards to 40 yards. Brilliant for hunting rabbits! ( if they are closer than 10 yards, you have the stealth of a ninja, and it would be easier and cheaper for you to hunt bunnies using a baseball bat!)
    OK...... bet you are way ahead of me now!!! LOL!!!
    Looking at the nice graph, the lines intersect at my zero of mass bunny destruction, 35 yards AND 14 Yards! AMAZING!!!!
    So IN THEORY, if I set my target at 14 yards, zero the scope spot on, in my 20 yard garden, when I go out in the field, put a fag packet, aerosol top etc... at 35 yards, I should hit it every time, holding the centre of the reticule on my chosen target! OK... you may have to fine tune it if you want to shoot mosquito private parts at 35 yards, but when I have done this, I am usually within half an inch of zero, and normally high or low.
    How does it work? To shoot at 35 yards (from 14 yards zero), It is because the pellet is setting out on it's trajectory and on it's way up at 14 yards, and falling on target at 35 yards, get my drift?
    No doubt my esteemed fellow forum members will expand on this method. LOL!!!!!
    Like....Shooting upwards, down a slope, with Weihrauch instead of a Brocock, shooting at 70 yards, wind deviation, etc.... etc.....
    I have not got too technical because as the title suggests, it is a newbie guide!
     
    Last edited: Jun 24, 2012
  2. andy draper

    andy draper Posting Addict

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    i will try that as i need to re zero.That chair gun may as well be my grandson playing with a spirograph he found on a car boot sale,why does it say -2 when you take the shot and not 0 just tooooooo complicated for me i have more chance of working out how to answer the wifes i phone.
    andy.
     
  3. SteveB

    SteveB Busy Member

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    Location:
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    I know what you mean. It says a 9 year old can build Ikea flat pack stuff, took me a whole afternoon trying to find one on our estate!!! LOL!!!

    It is saying -2 because the centre of the scope is 2 inches higher than the centre of the barrel. You set that in the part that says "Scope Height". It will NEVER read zero unless your sighting system is directly in line with the centre of the barrel. You really need Chair Gun to get it accurate first time, but it will still work, not so accurate.

    Not a good idea to answer your wife's Iphone!
    If it is one of her mates, you will have to tell them what has happened in Coronation Street, about the sales in "Next" and that nice little red dress you've seen, and the price of asparagus in Sainsbury's! Not a good idea, first her mate will suss out it's you, and secondly it wastes valuable hours of drinking time at the pub!
    OR...... it could be her boyfriend....... Nuff Said?.......LOL!!!!
    OH NO! Trust me..... Leave her phone alone! Ignorance is bliss!
     
    Last edited: Jun 25, 2012
  4. andy draper

    andy draper Posting Addict

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    Boyfriend!! i should be so lucky,we'd have got divorced years ago but neither of us wanted custody of the kids :D
    andy.
     
  5. SteveB

    SteveB Busy Member

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    I am lucky in that respect. We are Foster Carers so we can give ours back!!! LOL!!!
    Did you understand the -2 bit, Andy? Honestly, I don't know how Chair Gun really works in full, but I know how to do the basics.
    On my Webley .22, I zero at 30 yards, with the new Barracuda Extreme pellets.
    So............... It shoots 11.7ft/lbs, the pellet is 19 grains, so the first zero point is only 7 and a half yards!!!
    This is because it is a "Loopy" trajectory and mid flight (15 yards) the pellet is one inch higher than the centre line.
    With Air Arms Field (15.9 grains) it is shooting at 11.2 ft/lbs so the first zero point is 8 and a half yards.
    As you can see, if you want it as close as possible to start with, you really need to know what ft/lbs your gun is doing with your chosen pellet, and then use Chair Gun to work out the first zero point.
    If you don't want all the hassle, just set your target at 10 yards. With the figures above for Air Arms field, my zero would then be 25 yards.
    With the barracuda Extreme, my zero would (at 10 yards) be 22 yards and it would be shooting at 30 yards about 1 and a quarter inches low.
    Sounds like a load of Bo***xs but at least you will be on target close enough to fine tune it in the field.
     
  6. doodsy

    doodsy Donator

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    Why not accept defeat and go 177 fellas i use both to hunt and have to admit that overall my results are better with the smaller caliber, and less fuffing about the zeroing of a scope, come on you know you wanna:)
     
  7. Mad Marine

    Mad Marine Banned

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    No shoot a proper caliber and learn how to it properly :rolleyes:
     
  8. doodsy

    doodsy Donator

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    Easy on there mad, im only pulling your p----r, as i said i shoot both 177 & 22 both full power guns and i prefer my 22 rifle to shoot , but the 177 is the better killer what do you want me to say horrar the 22, happy now, have you tried hunting with the smaller calibre mate i used to be anti for my young earley years but changed , peace man
     
  9. andy draper

    andy draper Posting Addict

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    steve i can grasp the theory of it the -2 bit makes sense when you sit down,concentrate,and put your sensible head on,alas i tend to glaze over when facts and figures appear before me nowadays.I will however try this out,i did download chair gun once not for long i may add,but i don't like being defeated so time for a rallying call and a counter attack i think.I have a feeling doodsy has a valid point though :rolleyes:.
    andy.
     
  10. Oilysean

    Oilysean Very Active

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    have used this method to zero my scopes since i've owned rifles. Allways zero short, then I can fine tune when at a longer range before hunting. :) Good write up.
     
  11. Mad Marine

    Mad Marine Banned

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    Yup I do got both and prefer. 22 177 is just easyer due to flat trajectory of the pellet and a little wind up is nice especially wen someone biting the bait :D
     
  12. ratman60

    ratman60 Very Active

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    well steve b, newbie or not i think this is a good thread for anyone, ps how can i do????????????:confused: dont have a garden:D top marks:up: if i said how i try and zero you would all:rolleyes:
     

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