Trouble with Bulletflight Iphone comeups

Discussion in 'Long Range Hunting & Shooting' started by kustomkoatings, Oct 12, 2010.

  1. kustomkoatings

    kustomkoatings Well-Known Member

    Messages:
    64
    Joined:
    Feb 11, 2010
    Yesterday I was working on my dope for my .338, and I wasn't able to get Bulletflight to give me the right numbers. @ 800. Could someone look over my info and tell me what I might be missing.

    .338 LM 300 grain SMK @ 2830fps Zeroed @ 300 yards
    85 deg
    Baro 29.92
    Elev 400ft
    Wind 2mph from 11 oclock
    Cosine 0

    I was zeroed @ 300 yards and bullet flight called for 14 MOA up @ 792 yards and I was way over the plate I ended up with only needing 11.25 MOA . I had the same problem back in June in South Dakota shooting @ 947 I could not go from 600 yards up to 947 yards. If I used what Bulletflight called for I would be several minutes high. I have tried to fudge the numbers in every possible way but nothing adds up. I and 100 % positive that my muzzle velocity is right, I entered bullet bc with bullet database. I have played with the b.c. to try and get it right and nothing seems to get me close. I really need to get this figured out before I head back to South Dakota next month for muley season.
     
  2. nddodd

    nddodd Well-Known Member

    Messages:
    1,409
    Joined:
    Aug 30, 2005
    My g5 drag model called for 12 min at 790 and the g1 model called for 14.

    I've had better luck with the g5 model.


    Nathan
     

  3. albert

    albert Member

    Messages:
    22
    Joined:
    Mar 29, 2004
    the bc in the bullet flight data base isn't always right. I believe that they use published bc's. compare with others and check. I have had better luck using a g7 bc. I have had good results using the bc's in brian litz's book.
     
  4. mo

    mo Well-Known Member

    Messages:
    432
    Joined:
    Mar 5, 2006
    I had to adjust my velocity in my program. My rifle shoots around 2875 to 2900 I finally settled on 3150 fps in the ballistic program. I shot rifle at 500 600 700 800 yds and everything was dead on.
     
  5. RMulhern

    RMulhern Well-Known Member

    Messages:
    796
    Joined:
    Jan 2, 2003
    Totally amazing!!