Getting ballistics of each airgun

Hi guys. Curious what you use to get the trajectory or ballistics of each gun.

Currently I set a target at 10 yards and every 5 yards out to my max range with each particular gun. Using my scope mil dots I then make a small chart to refer to for each yardage drop. 

Is this the best method? 

Interested to see what you guys are doing. 

I use a chronograph...record readings then use ballistic calculator to establish dope sheet. You need inputs such as scope height above bore,weight of pellet in grains, etc...

I use a chronograph and Chairgun Pro which has a module to calculating he BC. I set the chrony at 1 yard and 30 yards.

I just shoot my airguns for fun.  I don't hunt or shoot competition so I don't worry about it.  Figuring my airguns out again is part of the fun getting reacquainted with each gun.  My springers have a lot of individuality and need to be shot differently.

I normally have all my scopes sighted in at 35 yards, which is the most common distance I shoot at.  Then, from there I have to figure it out again each time I shoot a different airgun.

I know guys that keep records like you do including pellet preferences, hold and rest positions, and range charts like you do.  It all makes sense.

David Enoch

@davidenoch

David's reply reflects my own feelings on the subject but I do agree that going through the efforts of learning these things could be valuable and interesting.

For me at least, there is no substitute for real world results. A gun either likes a pellet or it doesn't. For example, take the Crow Magnum pellet, I have found that pellet to shoot extremely well in several guns with serious knock down power. However, it has never performed well for me beyond 30-35yds, so I no longer wish to use them. I keep it simple: either I hit what I'm aiming at or I don't. I have tried chairgun in the past and it is an interesting tool but at times it was more like "arm chair quarterbacking" and conflicted with my results so I no longer wish to use that either.

There is something to science to be sure, especially when it agrees with the real world. I'm not a mathematician purist, but I do appreciate them and the work that they do. Maybe something will come along to spark my interest in BC's who knows?

Thank you guys for the input. 

I started with ChairGun Mobile and BC data gathered from all over the place. Here's a comprehensive pellet BC list after much searching:

Link:  https://airgunwarriors.com/community/airgun-talk/bc-table-22cal-comprehensive-internet-wide-collection-of-ballistic-coefficient-data/#post-15896

But ChairGun Mobile really is not helpful when wanting to switch pellets, rifles, etc.

So I found Strelok Pro, and it is truly amazing for practical shooting in the field.

Just last week a new mobile ballistic calculator was released, this is not as pretty as Strelok — but is has all kinds of otherwise complicated calculations even Strelok doesn't have (airtube fill and shots, trajectory graphs, BC calc. from two velocities and range, etc.) — and you can take it with you in your pocket, no PC necessary.

Link:  https://www.airgunnation.com/topic/official-release-simple-pcp-calculator-mobile (Owner has since deleted the file)

Also look at: https://gpc.fotosoft.co.uk

I like shooting by the numbers!

(1) Measure your projectiles BC with a chrono.

(2) Measure your MV with a chrono.

(3) Measure your scope height.

(4) Measure your range to target.

(5) Measure your wind direction and velocity with a anemometer, bluetoothed to your ballistic calculator.

(6) Enter the measurements into your ballistic calculator.

(7) Dial the numbers from the ballistic calculator on the scope turrets.

(8) ❌ Aim and shoot — for a first-shot hit!  ? ❌ 

Matthias

Does anyone know what the ballistic coefficient of a .35 diablo exact pellet?  Also, I saw on another chat where someone said to use G1 and the bullet type. But when I look at a chart of "G" types, it clearly looks like it should be a GL. What should it be???

Ballistic Coefficients - Hi-Lux Optics

I found the following BC value for the JSB dome 81gr:

0.053 (GPC ballistic calculator, ChairGun)

Matthias

What about the true scope clicks per inch 1/8 advertised may really be 1/7. Does this screw up results of ballistic programs? 

Yes, Don,

imprecise clicks will give you imprecise shots, even when using a dope chart instead of a ballistic calculator.

But most ballistic calculators have a function where you can

(1) Measure the actual clicks of your scope,

and

(2) Calibrate the ballistic calculator to the non-standard clicks of your scope.

Matthias

@jungleshooter I'll try that. I've been using .048.

I purchased an ATN X-Sight 4k Pro. It automatically calculates the distance and readjusts the recticle. The only caveat is that you have to enter the correct ballistics into the settings so it can calculate the correct drop. I think i'm going to get spoiled!!  lol