Connecticut Custom Airguns
  • Welcome!
  • Hector's Airgun Blog
  • Products and Products Blog
    • One-Off's
    • The "Héctors Special'" scope by Sightron
    • K1050i FT
    • The Hex Louver or "Secret Sunshade"
    • Pellet Path Calculator >
      • Questions, Answers and Comments on P-P Calc
      • Privacy Policy for PP-Calc
    • The Nautilus SideWheel
    • The X-10 TiltMeter
  • Zimmer-Silhouetten
    • Results 2017-2018
    • Results 2016-2017
    • Results 2015-2016
    • Results 2014-2015
    • Results 2013-2014
  • References and Links
  • Contact us
  • Store

Where we comment on "The App"

This is a comments, feedback, questions and answers page for the Pellet Path Calculator App.

Home

Establishing the TRUE scope/line of sight height

2/10/2015

2 Comments

 
Some of you have asked if the TRUE line of sight/Scope Height changes from venue to venue.

The truth is that it does. And it all comes from the way scopes work.
People think that the vertical movement of the lenses is what changes the optical path, and therefore changes the target image location in relation to the scope's tube, which changes the relation to the bore.

NOT SO.

What the turrets change is the ANGLE at which a lens receives the rays from the previous lenses.

Because of this, the TRUE LOS/Scope Height CAN and DOES change every time you make a zero-reset.

Sometimes this change is small, sometimes it is not so small. It does depend on how far from optical center you start with, but at times the true LOS height seems to change a lot.

Well, there is an easy procedure to get this number right with the P-P Calc app:

0.- setup your scope for the day. Make sure that everything is in focus and that you are comfortable with the clothes you have the stock setup you have and the scope setup you have. Moving any of these will affect the other, so once the Match starts, do NOT move any of these.

1.- Shoot a target at your zero distance and make sure you are well zeroed.

2.- Now shoot a target at your maximum yardage (usually 55 yards/50 meters) and make sure you have measured the drop correctly (either in physical dimensions, clicks or holdover in either mrads or Divs). 

3.- Now shoot an intermediate point. Let's say that your zero is 35 yards, and your Max distance is 55 yards, then pick 45 yards. If you zero is 25 yards (this is a "near zero") and your max is at 55 yards, then pick 40 yards. Whatever is an intermediate point will work.
If you did your job well, the two BC's for these distances will be pretty close together. Not exactly the same, but pretty close together.

4.- Now shoot a 10 yards group and note the position either in clicks or holdover.

Go back and save all this data.

Now display the POI graph.

You will notice that the curve is smooth and passes through the yellow circles for the zero, the intermediate point and the Max point.

Extrapolate to the vertical axis (Zero distance) and you will have measured the TRUE Scope / LOS height for that shoot. Plug in that number and then all the BC's should click in place and be very close together.

ALWAYS put MORE TRUST in the long range data than in the short range data. I would NOT endorse a Zero shorter than 30 yards, except for pistol.

If you get very discordant results, then re-shoot the targets starting with the long range ones.

Life is nor perfect and having problems at the sighting-in range is no fun. So get there early and do things slowly, methodically, and as well as you can from the first time.

Getting in a hurry will only slow you down.

Hope this helps!
2 Comments

How to use the Email sub routine.

4/27/2014

2 Comments

 
When you have established the proper trajectory you want to conserve, a long tap on the Table shown as POI and Wind drift wll bring up a context menu. The next to bottom-most option is :

"Email table as .CSV"

Choosing this option will display the EMail options you have on your device.

Choose the one your prefer and if you have not entered a default EMail, you will be prompted to enter it then.

Enter the EMail you want to use to receive the .CSV file and hit whatever button your program uses as a "send" button.
2 Comments

How to use this Sub-page

10/8/2013

0 Comments

 
When you download the app and have it loaded, try to follow the process described in the main page of the app. Should you have any questions, comments, or feedback, feel free to make them as comments on the pertaining section of this sub-page.

THANK YOU!
0 Comments

Questions

10/8/2013

4 Comments

 
4 Comments

Comments

10/8/2013

1 Comment

 
1 Comment
<<Previous

    Hector Medina

    25 + years experience in advanced ballistics.

    Archives

    February 2015
    April 2014
    October 2013

    RSS Feed

Proudly powered by Weebly