What's this reticle called, how does it work?

[Luckyorwhat]

I've heard it referred to as a 'range-finding' reticle, but I don't know how it would work.

And are those lines mil-dots, or just some random Tasco design?


Is the funnel used to measure width? Is it therefore calibrated to something already, like a person, or is it for you to set as you like? "Ah, at 75 meters a deer fits this wide."

More importantly, I suppose, is to ask if those curves are right, if that's the proper scale for things to diminish in distance! Or if that depends on what distance you start measuring at?


I guess another use would be that you could replicate the Horus Vision reticle, but in a cruder manner?

 

[blak ice 300]

I know that they use that kind of reticle of crossbows. I dont know how it will stand up to the recoil if it is for a crossbow??

 

[shotzee]

you can use any mil dot scope to approx range

 

[TDC]

With practice and patience you can range find with a Mildot reticle and be very accurate. This of course depends on the shooter who is doing the calculations.

Google Mildot reticle or check out the Mildot master website (www.mildotmaster.com) they explain it there.

TDC

ETA: This is a fun site, lots of practice for free.

http://www.shooterready.com/mildot.html

 

[Luckyorwhat]

I know that they use that kind of reticle of crossbows. I dont know how it will stand up to the recoil if it is for a crossbow??

Do you know the purpose of the funnel, it obviously has to be for sizing things up? Or is it for estimating wind-drift, like the bottom rung is low wind, the next one is a bit stronger, etc?


Maybe I just need to go out with a meter stick and a measuring tape and figure it out the hard way, by seeing what fits where at what range.



About the mil-dots, I'd heard of them, but those links really help me understand clearly, thanks.

 

[Juster]

On antitank weapons, the funnel is for width.`
http://www.globalsecurity.org/military/library/policy/army/fm/3-23-25/ch2.htm#par6

 

[Luckyorwhat]

Awesome, thank-you! I guess I need to see if my Tasco will handle mounting on a 14.5! That must be it, it's measuring width. I guess that barring any T-xx tanks to shoot at, I could just find a standard target size, and see adjust magnification until it starts fitting into the lines at predictable intervals, then use that to estimate range in the future.

I found this one, and the company only knew it was for different ranges, no instruction manual: http://www.deben.com/optics/riflescopes/crossbow.htm

And this one shows a logical progression, like a ballistic plex:

 

[lcq]

I have the same reticle in my Marstar Scope. It would be nice to get some data on it.

Brian

 

[Luckyorwhat]

To be honest, I've got two of the scopes, because they're not very expensive and I need something to last until I save up for USOptics. The irony is that I've learned they're actually counterfeit Tascos! Can you believe that? And though I've got two, they have different turrets (1 has threaded caps, the other doesn't).

I got more info. To summarize, my suspicion is that the reticle is candy, and if it can be used for anything more than a cross-hair that's a bonus. But nevertheless I'm experimenting with sizes and seeing what fits where.

I marked off some distances at the range and tried to calibrate it, but I spent too much time sighting-in a .22 so the sun started setting before I'd barely got the rifle with this scope out of it's case.

What I did see was that at 6x magnification, the lowest setting, an 8.5" wide piece of paper took up about 6 spaces marked out on the crosshairs at 25m. If they were set up to be mils, like a mil-dot scope, I calculate the paper would only fill 6 slots at 36m. Thus I suspect the reticle wasn't even supposed to be used in a 6-24x scope. Ergo if the scope's going to be useful to me, I'm going to have to invent my own system, and/or find a magnification setting where it fits back in (I'm getting a pacing wheel and cutting out metric sized squares of paper for the next range trip). Then once I find a magnification where the crosshair stadia have some sort of meaning, probably 1/2 or 1/4 mil, as 1/2 would be more practical but 1/4 I'd be more accurate in calibrating it. Then I'll etch the magnification ring and scope body so I don't lose that mark, fill the etch in with white-out and cover it up with clear nail polish. After that I'll start looking for meaning in the range-finder funnel. I've got big 1mx1m sheets of heavy paper that will help with that.

I'm starting to get it, I think that if something is 2 units long you use the whole funnel, and if it's 1 unit long you use half the side. I'm thinking there's not a lot of objects out there that are 2units by 1 unit in their dimensions, besides MBTs and Jeep TJ/Wranglers.
http://www.globalsecurity.org/military/library/policy/army/fm/23-11/Ch5.htm#top

These lines are developed from the mil relation formula and are designed to enable the gunner to estimate range to targets having a 10- or 20-foot dimension.