Help me understand the S&B P4F reticle


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esheato
April 2, 2011, 04:37 PM
I'm having some trouble understanding the S&B P4F reticle.

I have several Nightforces and have the MOA system down. I also understand the process around drop charts and dialing my elevation to get to distance and the difference between FFP and SFP, of which this is the former.

The mil system is new to me however so the reticle just isn't making sense.

Here it is:

http://esheato.smugmug.com/photos/1236648097_XRdoV-X2.jpg

From what I've gathered, the spacing on the bottom (O, N, M, L) is for ranging people. This graphic is what I'm talking about.

http://esheato.smugmug.com/photos/1236647712_q3iwY-XL.jpg

The graphic makes sense...you bracket them however you can, (top is head only, bottom is head to crotch) realize the distance, then hold or dial and press the trigger.

I guess my first question is what is the distance from center of the reticle to the first horizontal hash below center?

Also, if you look at the chart at the bottom, it's in cm/100m or in/100y. I don't get it, why does that matter? I guess I'm used to the Nightforce NPR-1 where the spacing is 1 MOA between lines.

Anyway, I don't use inches when I'm dialing MOA...I use the reticle to gauge how much I'm off from my first shot and adjust the proper number of clicks to get me on target.

Additionally the optic adjusts .1 milrad at a time.

Looking at JBM ballistics, these are my options for selecting the units of drop:

http://esheato.smugmug.com/photos/1237232146_6WtbV-L.jpg

Obviously it's not MOA or inches, but with the clicks equaling .1 mil, which one do I select?

So when I calculate on JBM, this is what I end up with:

http://esheato.smugmug.com/photos/1237240542_exLzH-X2.jpg

Looking at the drop, I've selected it to be 1.00 mils. So I end up with nice numbers that I don't know how to find on the reticle.

I hope nobody thinks I'm dumb...I just need a push in the right direction.

I really appreciate the help,

Ed

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esheato
April 3, 2011, 09:27 AM
Anyone?

esheato
April 3, 2011, 12:52 PM
Alright, just to close the loop here, from center crosshair to first hash (any direction) is one mil...with the smaller hashes in between being .5 mil.

My JBM chart was right...select mils. With the optic being a .1 milirad adjustments, 10 "clicks" equal one mil.

The spacing on the bottom of the reticle...whatever. Doesn't seem like anyone uses it. And when I'm zoomed all the way in, due to the FFP design, I won't be able to see it anyway so no big loss there.

If anyone has any other info, I would appreciate it.

Thanks!

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