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trajectory calculator help

 
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  #8  
Old 09-17-2012, 02:05 PM
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Join Date: Aug 2012
Posts: 13
Re: trajectory calculator help

I checked my chrono with some Eley 17 mach 2 loads that ranged from 2120 - 2258. That's prettyclose to the factory specs. .
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  #9  
Old 09-17-2012, 04:36 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
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Re: trajectory calculator help

Quote:
Originally Posted by Round2it View Post
I checked my chrono with some Eley 17 mach 2 loads that ranged from 2120 - 2258. That's prettyclose to the factory specs. .
If your velocity of 2945 was correct and you are using a 60gr v-max, you would have to have more than doubled it's BC to get that trajectory (.600 instead of it's published .265). I will assume the 2.6" sight height is correct.

I doubt that the published BC is off by much.

That leaves only a these of other possibilities:
a. Velocity
b. Sight in distance.

You are sure of your sight in distance of 100. That leaves velocity as the only other possible to create that kind of difference. The 3250 fps velocity that was posted earlier would work.

Try some further distances to check your adjustments. I bet if you try using this much higher velocity you will find yourself getting much closer to your correct trajectory.
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  #10  
Old 09-17-2012, 04:44 PM
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Join Date: Aug 2012
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Re: trajectory calculator help

I have checked and rechecked my components and data - I have not checked the assumed 100 yard target lately. Now that I think about it, the target was taken down for mowing then put back up, presumably at the same distance. I will check that when I go back out this week. I really hope that's it.
Thanks!
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  #11  
Old 09-17-2012, 05:01 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
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Re: trajectory calculator help

Quote:
Originally Posted by Round2it View Post
I have checked and rechecked my components and data - I have not checked the assumed 100 yard target lately. Now that I think about it, the target was taken down for mowing then put back up, presumably at the same distance. I will check that when I go back out this week. I really hope that's it.
Thanks!
Yeah that might help. However, unless it was moved about 85 yards further away, which I'm sure you would notice, your velocity is still going to need to change drastically.
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