Help with Creedmoor Sight

[Mac Attack]

I purchased a Pedersoli Sharps model 1874 reproduction in .45-70 which has a Creedmoor rear (model USA431 http://www.davide-pedersoli.com/img/Accessories/USA%20431.jpg),Hadley eyecup and globe front. I read the instructions that came with the sight but am still clueless on how to use it. Here is what I know:

Elevation adjustments:
Staff is 3 inches long grated into 20 lines per inch
Each line on the staff is equal to .050" = 5MOA or 5" at 100 yards
The Vernier scale has 5 lines at .010 each = 1 MOA or 1" at 100 yards.

Windage adjustments:
Upper scale on the Vernier scale has 10 lines at increments of .020" = 2MOA at 100 yards
Lower scale has 10 lines at increments of .040" = 4MOA at 100 yards

My overall sight radius is 36" and my barrel length is 32".


Hell I never realized I had to be a mathmatician to shoot one of these! Since this is the first time shooting with a Creedmoor can you all provide me with some tips for shooting with it. I plan to shoot at 100 - 200 yard. targets.

Some questions:

1. There is no index on the elevation settings. How do I know what elevation I have my sight set to?

2. My windage has an index so I can see what my settings are but what should I set it at if there is no wind?

3. What MOA should I set my sights for 100 yards? Should I start closer than 100 yards to get it sighted in? The instruction manual had the following table:



Does this mean that at 100 yards I should set my elevation MOA to 1.04?

Any advice and guidance would be greatly appreciated.

Mac

 

[arcticap]

I would guess that every movement of the knob is relative to the eyepiece starting at it's "zero" position for your rifle and load at 100 yards. So first you will need to sight in your rifle to find where "zero" actually is and not simply where it's supposed to be on the sight.

The linked picture of the sight that you posted seems to clearly show a height index engraved into the side of the ladder. Once the elevation is "zero'd" for your load and gun, then you need to take note of the exact location of the height of the eyepiece on the ladder as indicated by the postion of the engraved lines to be able to return to where they originally matched up.

Using new sights probably requires a break in period to learn about them and to get used to using them in the field. A reference sheet of the most often made adjustments at the distances that you shoot at with their corresponding values in inches/feet would probably be helpful.

 

[Mac Attack]

arcticap
"The linked picture of the sight that you posted seems to clearly show a height index engraved into the side of the ladder."

On the ladder there are gradiated lines up to 3 inches, but there is no line on the eyecup which I can use to match up with the increments on the ladder. Unless I am not seeing it? Am I supposed to use the Zero mark on the vernier scale as my sight index?

 

[Jim Watson]

Am I supposed to use the Zero mark on the vernier scale as my sight index?

Yes, as a rough index. Do you know how to read the vernier?

 

[Mac Attack]

Yes, as a rough index. Do you know how to read the vernier?

Not really, can you teach me how? I know only what was in the instruction manual. But have no practical experience with this type of sight. A tutorial would be greatly appreciated.

 

[K.A.T.]

Zero

Look on the side of the slide that the eye piece mounts to, there is your zero.

 

[Jim Watson]

Instructions on reading a vernier sight are at:
http://www.montanavintagearms.com/vernier_instructions.html

 

[billnpatti]

In the picture, the sight is set to 1.351. Here's how you read it: Look at where the 0 oline on the vernier is located. In the picture it is just above the 1.35 mark. Then look at the five lines on the vernier to see which of them line up exactly with a line on the sight. In this case, you will see the 1 is the one which is lined up with one of the sight scale lines. So, you take 1.35 and add a 1 to the end to get 1.351.

 

[Iggy]

Great information and explanations guys.

Thanks to both of you for your time and efforts.