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Thread: 100 yds --- 200yds Shot drop

  1. #1

    100 yds --- 200yds Shot drop

    Got a nice load for my .243 100gr interlocks (42gr N160) and can group .75" at 100yds , all seems fine. Tried a target at 200 yds to see the drop and I know 100gr in 243 is a little heavy for them but a drop of 4" seems a lot to me , has anyone any opinions on this.

  2. #2
    Perfectly normal , zero at 200 and remember 209 !

    100= 2" high
    200= 0
    300= 9" low

    should cover most common stalking calibres ?

  3. #3
    i agree 4 '' seems a big drop , try 1/2 or 3/4 inch high at 100 and then the drop may be more acceptable ,worth a try ! what are your max ranges approx? that seems a good formular above

  4. #4
    Those numbers suggest a muzzle velocity in the region of 2800 ft/sec. If you are happy with that load then adjust zero to be 1" high at 100yds which will then be only 2" low at 200yds. If you increased velocity to 2900 ft/sec then the numbers would be 1" high at 100 and less than 1.5" low at 200.

    Andy.

  5. #5
    Putting the BC 0.405 and sight 1.6" above bore-line into the Norma ballistic calulator, this drop suggests a MV of 2700fps or so.

    A 200yds zero gives +2" at 100yds and -8.5" at 300yds - near as dammit exactly as predicted by tackb.

  6. #6
    Quote Originally Posted by Dalua View Post
    Putting the BC 0.405 and sight 1.6" above bore-line into the Norma ballistic calulator, this drop suggests a MV of 2700fps or so.

    A 200yds zero gives +2" at 100yds and -8.5" at 300yds - near as dammit exactly as predicted by tackb.
    works for most stalking calibres and its close enough out to 300 for kills , an inch more or less isn't going to take the shot out of the kill zone.

  7. #7
    It's worth downloading a ballistic calculator app and having a play then you can tailor your set-up to your needs.
    I use the Swarovski Optiks app as it matches my scope but if you ignore the 'reticle' page, you could use the data for any scope.

    If your rifle is solely for stalking then +2" at 100 is a great compromise as tackb says.
    For me however, I need to be able to shoot whatever vermin etc I encounter as simply as possible with each rifle.
    So with the +2" zero method, I could well be 2.5" or 3" high at other points of the curve which would mean a miss on a rat, stoat, mink or squirrel.

    The best compromise for a point blank zero with my .223 firing 50g Norma's, turned out to be a 225y zero which meant I was never more than 1.5" high or low all the way from about 5y out to 265- pretty versatile.

    For my .243 firing 70g Federals and less likely to be shooting tiny stuff, I zero 1.6" high at 100 which is a 250y zero and only 2.9" low at 300y. However, it does get up to 2.0" high at 150y.

    Like I say, have a think about what you require and use the app to do the leg work, then zero well to that point.

    I use the Swarovski app to get initial factory load data then use 'iStrlok's point of impact Truing facility to find out my actual muzzle velocity. So using the generic data I was supposed to be 12" low at 313 yards. However, a quick field test measured only 10" low so the app was then able to calculate my actual Muzzle Velocity and 'true' all the data.

    it all sounds complicatd but is pretty intuitive to do and you only need to do it once

  8. #8
    Quote Originally Posted by tackb View Post
    Perfectly normal , zero at 200 and remember 209 ! 100= 2" high 200= 0 300= 9" low should cover most common stalking calibres ?
    that seems quite loopy for all but the 308

    most of my calibres are:
    +1"@ 100
    0 @ 200
    6-7 @ 300


    50gr .222 (bit worse for this one admittedly at -8 at 300)
    87gr .243
    130gr 270
    not tried or loaded the 300Wm but I chose it because it mirrors the .270

  9. #9
    2,0,9 works for my .308 too with 150gr BTSP interlocks at 2770fps
    Below is a link to my website.
    Quad sticks

  10. #10
    For the metric ly minded I have read that zeroed dead on at 100m the drop for 200 and 300 is 15 and 50cm (for the regular stalking chamberings ie mv ca. 750-800 m/s)

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