BC for 22 LR bullets

[KnotRight]

I can not find the BC calculator that someone posted earlier. I would like to know if there is one that is available for Samsung phone or get the BC for the popular 22 ammo that is one the shelf.

 

[11B CIB]

This? It’s not an app but has some good data

http://www.shooterscalculator.com/ballistic-trajectory-chart.php?t=4e72518c

 

[KnotRight]

Thanks 11B CIB. Just plugged in the Federal 22 information and ran it on Bullet Flight app. It looked to be around 6" difference at 200 yards. The BC's from the website is .138 and the velocity is listed at 1,200 f/sec. The app says -32.2" (-15.4 MOA) and from the graph at 200 looks to be around -38". I have the zero at 100 yards.
I am guessing but would you think most BC for round noise 22 LR would be around the Federal's of .138?

Thanks,

 

[11B CIB]

What’s the bullet spec? Lead/copper RN? What weight?

I’ll see if an app I use has a different result

 

[Tim]

Here's a simple way to figure it out if you know muzzle velocity.

Get your zero settled.
Plug your MV and a guess at BC into your ballistics calculator (Strelok, 4dof, etc)
Let your calculator solve for your 200yd adjustment. Let's say the solution is 15.4 MOA
Shoot at 200
Let's say you find that your actual adjust at 200 is 15.7 MOA.
Adjust your BC until the solution and actual dope agree.

BC printed on a box or published online is only valid for a certain MV at certain distance, etc. every rifle is different, so it makes sense to true you BC as described above.

Long range center fire rule of thumb is to adjust your muzzle velocity in the calculator to match actual dope for ranges up to 75% of your supersonic range. For further distance, adjust your BC until the dope matches reality.

 

[KnotRight]

Tim, here is the input and out put

 

[Tim]

@KnotRight , I have not used that app so I can't give specific direction. Strelok and Kestrel\Applied Ballistics both have inputs for things like barrel twist, muzzle velocity, scope height over bore, and BC. Somewhere in there you ought to have a "truing" function that lets you indicate your actual dope at certain ranges.

 

[Tim]

Make sure you fill in that altitude box. Air density is an important component.