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Sharps Rifle sighting in

Discussion in 'Black Powder Shooting / Muzzleloaders / Handguns' started by lthome5, May 12, 2008.

  1. lthome5

    lthome5 New Member

    Joined:
    May 12, 2008
    Messages:
    4
    I am new to black powder cartridge rifle shooting. I have a C. Sharps .45-70 1874 rifle that I plan to take on a bison hunt. I need help with sighting in. I have a mid range Soule sight. My barrel length is 30 in and my sight radius is 34.5 inches. If I sight it in at 100 yards, and I want to hit the bulls eye at 300 yards, how do I adjust the sight? Also, if I am, let's say 2 inches low at 300 yards, how do I make an adjustment on the sight to bring it up the desiried 2 inches? Please help. I am new to black powder cartridge shooting. Thanks
  2. delta13soultaker

    delta13soultaker New Member

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    Location:
    Depends on Uncle Sam's whim every 3 yrs.
    Your Soule sight should have an ELEVATION knob on the side. Moving your rear sight up will cause the impact of the bullet to rise.

    I don't know the brand of your sight so not certain of the MOA on the elevation. (I think 2.5 MOA clicks is standard for windage though.)

    To know how far to turn your elevation knob you need to find the trajectory for your ammo, and the MOA of the elevation knob. (The MOA may be in the manual.....or call the manufacturer....the other option is to shoot until you can see the MOA yourself by measuring the distance between groups at same distance when you adjust the sight.)

    Here is an example of the difference.

    weight velocity 100yds 200yds
    45-70 (300 HP at 1800) +2.7" -9.2"
    45-70 (405 FP at 1330) +1.3" -22.9"

    Once you know the MOA you just need to do the math.

    1MOA = 1" @ 100yds. So a click from a 1MOA sight will move the bullet impact 1" at 100 yards. A 2 MOA would move 2" for a click at 100 yards.

    MOA doubles every 100yds.

    So at 200 yds the click would move you 2".

    So if my sight is 1MOA and I want to move my impact up 10" at 100 yards I will turn the knob 10 clicks up. For 10 inches at 200 yards I only need 5 clicks.

    Hope this helps.

    P.S. 2" at 300yds is nothing to worry about if hunting bison.
    Last edited: May 12, 2008
  3. mrkirker

    mrkirker New Member

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    Jul 13, 2007
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    3,067
    R/S/F/O
    Rear Same; Front Opposite.
    When sighting in remember:
    R/S/F/O
  4. 59sharps

    59sharps New Member

    Joined:
    May 31, 2008
    Messages:
    1
    0k here you go x = (C x S ) / R
    X IS THE REQUIRED ADJUSTMENT
    C IS POINT OF IMPACT CORRECTION DESIRED ON TARGET
    S IS SIGHT RADIUS (FROM THE EDGE OF REAR SIGHT TO THE EDGE OF FRONT SIGHT MEASURED FROM THE SIDE OF THE SHOOTER SEES WHILE SHOOTING.)
    R IS RANGE TO TARGET.
    ALL DIM MUST BE EXPRESSED IN INCHES. (IE 100YRDS = 100YRDS X 3' X 12" =3600"
    USING WHAT YOU GAVE ME EXAMPLE (2X34.5) / (300YRDS X 3' X 12") = .00638" OR (69" / 10800")
    OF COURES USING THIS FORMULA YOU NEED TO ALREADY KNOW WERE YOU ARE HITTING AT GIVE DISTANCES.
  5. musketshooter

    musketshooter New Member

    Joined:
    Apr 5, 2007
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    Montana
    You will have a heck of a time shooting a buffalo with a peep sight. That is a target sight, not a hunting sight. I know, I have tired it. When you say bufflao hunt, you must realize that you will probably be within 100 yards of your target. Even "wild" buffalo are more like cows than wild animals.
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