Windage and Elevation

[camies 1]

About 10 years ago I bought a Daystate Harrier .22, lovely bit of kit.

OK, compared to todays lightweight offerings a bit of a beast but it will land a pellet on a pellet at 30 yards with monotonous accuracy. (The gun is good, any errors are all down to me!)

 

Recently I changed my scope (Harriers don't use iron sights) and found myself in a quandry about mildots, MOA and shotfall. Problem was solved and lamping that night went superbly well. It did open my eyes to the amount of ballistic programs available as freeware on the Internet. The key word here is FREEWARE so you rich people with the expensive programs might wish to skip this topic.

 

In a nut shell I found a few "idiot proof" programs but all with one thing in common. Enter the same values of range, Muzzle velocity, BC, Calibre, Pellet weight, etc and you will get a different set of answers from each package.

 

From target shooting days (a long, long, long time ago) range charts for drop and windage were easily available but not so with airguns.

 

Now I know that "computers" are not a substitute for results gained by actually throwing lead down a range but they did raise a couple of questions.

 

Why are there so many differences in the results and what is the most popular FREEWARE package in use by you members?

 

Your comments appreciated.

[Guest buster321c]

Chairgun mate ,

 

http://www.chairgun.com/

 

 

Try it and see , to he honest they baffle me

[Deker 3,478]

I've used some of these tables over the years and found them a useful guide, never found one that was accurate.

 

Simple reason is there is quality of production/tolerence/weight of the pellets, barrel conditions/length....power of gun...whose chrono is correct, it goes on and on...then there is the guestimation/quality control that goes into producing the tables themselves!!

 

They can be helpful... but never trust them, use as a guide and then check in the field yourself !!!

[Coney 3]

Always had me stumped???

[ghillies 209]

airgun ranges are amaizingly short, the chairguns usualy not on untill after the first zero, but from there on in the scope rets are to a tolerence, same as the rest above in the other posts..

 

however, after fine tuning it (and a bit of reading the help section) it does get closer..

 

side issue of dialing in, you gets it turret clicks are aften 'odd', but constant so usuable.

 

 

in reality you working in feet, with rimmies up to what ever caliber the speeds and weights of the bulets are big enough to gain data like the weights much easier, a hunfreth of a gran on a 30 grain mak 4 sonic wont make that much diference this side of 400 yards... at 800 things get a bit warmer and the groups start opening up.

 

at 12fp's 60 yards is a shot to repeat, at 30 beghh.. it's nuthin is it. you will find often a 10 grain pellet and an 8.5 grain pellet will both 'hit' at 30 yards on the heavier pellet zero..after that it goes to pot the further away you shoot..

All said and done the programs just cut out a majority of the foot work, and you do need to check it out for real, as you would do any way.(just that your a lot closer, to within a couple three clicks either way).