Question on Soule sight graduations

[1886nut]

Although I've used tang sights most of my life, these have been mainly limited to simple elevation only sights. Recently acquired a C Sharps highwall with an MVA Soule on it. Could someone explain to me what the manufacturer means by "44 MOA" of windage or "289 MOA" of elevation.....Isnt this all dependent on barrel length / sight radius as well as my particular load? I guess it would be helpful to know the thread pitch on both the windage drum and the elev. screw to understand this better. Does anyone know what these are? I suppose I could call MVA, but since I acquired the sight second hand, I think it would be imposing myself by asking for a free lesson in longrange BPCR shooting, and I'd rather learn on my own with a little help.

[montana_charlie]

Yes ... the amount of change in your point of impact will be one MOA with a particular barrel length (sight radius).

The Soule-type sight movment is graduated in hundredths of an inch. In round numbers, a hundredth of an inch of change will equate to 'one inch at a hunnert yards' if your sights are 36 inches apart. You'll get one MOA of change if the sight radius is 34 inches.

One full rotation of the windage drum will move the staff sideways 2.5 hundredths ... or 2 and a half inches / 2.5 MOA (depending on barrel length).

A more universal 'increment' to use when discussing Soule sight settings is the 'point'.
If you increase elevation enough to get 'five inches' or '5 MOA' (again, depending on barrel length) it's easier to say that you went up 5 points ... with 'points' referring to the actual marks engraved on the sight.
Turning the windage drum enough times to track the staff from extreme left to extreme right will give you a total movement of 44 points.

I made this drawing a year or two ago for another guy, but saved it because it seemed easy for him to understand.
If it doesn't answer your questions, try me (us) again while being more specific.

CM

http://i684.photobucket.com/albums/vv203/montana_charlie/VernierScale.jpg

[Don McDowell]

The 44 minutes of windage is 22 minutes right and 22 minutes left of zero (that's the long mark in the center) Each mark on the drum represent 2 minutes +-. The numbers on the drum adjustment represent 1/2 minute.
286 minutes elevation is just that..The staff markings are 5 minutes per mark, you get adjustment from 1-4 minutes by using the markings on the eyecup slide.
The number of minutes required to hit the target at any chosen distance will depend on your front sight height, and the trajectory of your load.
The marks may not be exactly a minute due to barrel length etc, but they'll be close enough that you can move the poi from the 5 ring to the x ring.
I'ld about bet MVA will send you the paper that tells how to use the sight , if you call and ask.

[Tom Myers]

Imparting the same information as Charlie's excellent post but using a slightly different approach.

Click the link How to read a Vernier Sight (http://www.tmtpages.com/vernier.htm) to view this page on my website.


Hope this helps.

[montana_charlie]

Or ...

You could get information on your MVA sight straight from the people at MVA.
http://www.montanavintagearms.com/soule_instructions.html

CM

[Chill Wills]

Or ...
You could get information on your MVA sight straight from the people at MVA.
http://www.montanavintagearms.com/soule_instructions.html
CM

Yours and Toms are really very good. MVA could upgrade their instructions by looking at this.
There are match shooters that have been around for years in this game and have never taken the time to learn this.

[mehavey]

http://i46.tinypic.com/6eouoo.jpg