Questions about the C79

[jfahy]

Hello,

I'm making myself a C79 cheat sheet for my battle book - or trying to.  I'm missing a few basic pieces of information and haven't been able to find them anyplace, hoping someone here can help me out:

1. How wide, in mils, are the horizontal lines?  (Stadia lines??)

2. How high, in mils, is the space between the two lines to the right of the post?

3. When you're zeroing the sight: I've found one source which says one click = 2.5cm at 100m, and another which says one click = one minute of arc which is 2.9cm at 100m if I'm doing my math right.  What's the truth?

 

[Nfld Sapper]

From my "coaching notes",

1 click = 25mm for 100m zeroing

but for 25m zeroing,

1 click = 6mm

 

[jfahy]

1 click = 25mm for 100m zeroing

Cool, that agrees with the more official-looking of my two sources.  Thanks.  ;D

 

[Fusaki]

3. When you're zeroing the sight: I've found one source which says one click = 2.5cm at 100m, and another which says one click = one minute of arc which is 2.9cm at 100m if I'm doing my math right.  What's the truth?

As NFLD Sapper said, 1 click is 25mm (approx 1") at 100m.  It is also 1 Minute of Angle.

Here's the Shoot to Live PAM, which is full of the kind of info you're looking for:
http://www.scribd.com/doc/3617434/canadian-bgl382003pt001-2002

As well, take a look at this thread for a bit tangent of ballistics theory:
http://forums.army.ca/forums/threads/85162.15.html

 

[jfahy]

Here's the Shoot to Live PAM, which is full of the kind of info you're looking for:
http://www.scribd.com/doc/3617434/canadian-bgl382003pt001-2002

...and that was exactly what I've been trying to find!  Cheers.

 

[bender]

As NFLD Sapper said, 1 click is 25mm (approx 1") at 100m.  It is also 1 Minute of Angle.

That's what I was thinking - ie 1MOA = approx 1" @ 100m.
However, it is more than a little out of my lane, so no more from me

 

[jfahy]

That's what I was thinking - ie 1MOA = approx 1" @ 100m.

They're really close.  A minute of arc is 3.6mm more than an inch deflection at 100m, so if you assume it is an inch you'll be off by just over half an inch at 400m.  That's not big enough to show in any grouping I've ever done. 

Edit: Sloppy language on my part, somewhat improved now.