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Thread: Trajectory calculation issue

  1. #1
    dog chaser distant stalker's Avatar
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    Trajectory calculation issue

    While at the long range shoot in Kurow we had the opportunity to confirm our drop charts and collect some real data. I got the following real world results (all in yards because 1000 yards sounds way cooler than 900m) rifle is zeroed at 100m (110 yards)
    343 - 4moa
    480 - 8.5 moa
    568 - 11.25 moa
    697 - 15 moa
    850 - 20 moa
    5 degree angle
    7mm mag firing 168gr berger vlds at 2960 fps (thats what chrony told me but 2900 seems to replicate the trajectory better)
    I am using shooter and having issues getting the numbers to align to the real world results. Anyone want to join me in trying to get things to line up?
    The frustrating thing is my other 2 rifles are spot on straight from shooter so think something must be wrong with the input data.
    Might have to go and do another long range dady and do the data collection again to confirm but it was all pretty convincing on the day with shots landing as they should with the various corrections etc.
    Wondering if maybe when we were ranging the steel targets we were actually getting readings off the ground in front/behind
    Gimp did you measure the ranges to each plate from the plates at all? Did anybody else get different ranges for the plates?

  2. #2
    Impure Lead Flinger
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    where are you getting chrony data?

    Are you using litz BCs?

  3. #3
    R93
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    I think you have sussed it already HH. Until you can confirm the ranges are correct you could be creating a larger problem.
    How much different are the soloutions, more or less MOA? I use the same program (shooter)as well as JBM on my phone and can have them both open to compare. I sometimes get a slight difference but shooter seems the most precise. Thanks BB!
    Ranging small plates without a background can be frustrating after a few rounds are wasted.
    Accurate speeds, atmospherics and BC's are very important as well.
    Last edited by R93; 29-02-2012 at 11:03 PM.

  4. #4
    Impure Lead Flinger
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    yeah I always range multiple ranges myself with my own gear... never use other guys data either..... you always seem to end up mucked up...

    Special when kiwigreg tells you XY range and umm greg why am I 2m low?
    R93 likes this.

  5. #5
    Impure Lead Flinger
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    Actually I had a rifle sighted in for 100yd but use meters for ranges soooo maybe if you check shooter settings and set the zero to 110 in the edit rifle data bit or better yet be less confusing and sight in for 100yd.... mine was alll way up the fuck when I had that... the other thing to make sure is right is correct sight height it can make a fair difference to (half bolt dia+half scope dia+distance between scope and bolt)

  6. #6
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by baldbob View Post
    yeah I always range multiple ranges myself with my own gear... never use other guys data either..... you always seem to end up mucked up...

    Special when kiwigreg tells you XY range and umm greg why am I 2m low?
    Or um spotting for you and you wouldn't believe me you were 4-5m right of target! 3 or 4 shot later you realized you went wrong way with windage! shouldn't have brought this up I know after the incident up the river when I had lost my windage Zero but couldn't help myself
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  7. #7
    R93
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    Quote Originally Posted by veitnamcam View Post
    Or um spotting for you and you wouldn't believe me you were 4-5m right of target! 3 or 4 shot later you realized you went wrong way with windage! shouldn't have brought this up I know after the incident up the river when I had lost my windage Zero but couldn't help myself
    Uh Oh!!! Your in the poos now

  8. #8
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by R93 View Post
    Uh Oh!!! Your in the poos now
    Im waiting for the backlash
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  9. #9
    R93
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    Quote Originally Posted by veitnamcam View Post
    Im waiting for the backlash
    If I know BB he's brewing a goody!!!! Or gone to bed

  10. #10
    Almost literate. veitnamcam's Avatar
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    I can take it so can he
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  11. #11
    Impure Lead Flinger
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    Its true he had a serious issues with putting things sheeps bums that day....

  12. #12
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by baldbob View Post
    Its true he had a serious issues with putting things sheeps bums that day....
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  13. #13
    R93
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    Quote Originally Posted by baldbob View Post
    Its true he had a serious issues with putting things sheeps bums that day....
    He is practically a Coaster then Adam?

  14. #14
    Almost literate. veitnamcam's Avatar
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    dammit you bet me to it
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  15. #15
    Impure Lead Flinger
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    Quote Originally Posted by R93 View Post
    He is practically a Coaster then Adam?
    I must say he excelled at the initiation.....

 

 

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