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6.5x284 drop chart

 
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  #8  
Old 10-16-2013, 08:25 PM
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Re: 6.5x284 drop chart

Did you use Brian Litz's corrected BCs? Sounds to me like your chrono may not be 100% and you could be a bit slower than you think, unless another confirmed rifle and distance have been proven.
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  #9  
Old 10-16-2013, 08:40 PM
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Re: 6.5x284 drop chart

Used G7 of .313....also tried the corrected MV function in the shooter program by entering your actual drop and distance. It gave me a mv of 2510....I really dont think its going this slow
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  #10  
Old 10-16-2013, 08:56 PM
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Re: 6.5x284 drop chart

It could be that slow. Testing tonight I saw big velocity changes with seating depth etc. I think you will have to shoot 500 and measure actual drop.
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  #11  
Old 10-16-2013, 09:13 PM
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Re: 6.5x284 drop chart

Well that's a good point...I am seating them long .I will shoot and confirm....thanks for everyone's help
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  #12  
Old 10-16-2013, 10:58 PM
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Re: 6.5x284 drop chart

Quote:
Originally Posted by pills View Post
after getting my load right (51.5g H4831sc/ Lapua Brass/ 140g Berger VLD hunting @ 2750fps) in my Cooper 24" 1 in 8 barrel. I am making my drop card, using shooter app. and JBM program. Both gave me the same values . With a 200 yrd zero they give me a 300 yrd drop of 2.4moa (10 clicks) Vortex 4-16 PST on MOA. Problem is when I shoot this I end up 2.5" low at 300. I shot two 3 shot groups then switched to 3 MOA (12 clicks) and was shooting dead center. groups were all very good for me .6 to 1.75" at 300. Any ideas on the difference in the programs and actual results?

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I just quickly ran the data you provided above in QuickLOAD and it spit out a velocity of 2721. With a 200 yard zero the come up for 300 is 2.39 MOA so your data is close

So if I was getting what you are the first thing I would look at is the zero. It has to be absolutely perfect for the come up data to be correct. In your program run it with a zero of 195 yards and see what you get. In QL that come up would be 3.09 MOA. So if you are zeroed just a tad low at 200 like a 1/4" (a guess) that would account for what you are seeing. Something to check.
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  #13  
Old 10-16-2013, 11:15 PM
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Re: 6.5x284 drop chart

Quote:
Originally Posted by pills View Post
Used G7 of .313....also tried the corrected MV function in the shooter program by entering your actual drop and distance. It gave me a mv of 2510....I really dont think its going this slow
I doubt very much that you are going that slow. The velocity calibration in Shooter doesn't give meaningful information at 300 yards. You need to get out to longer ranges. Using this function at 1000 yards a .5MOA correction is 30FPS. At 300 yards it's 224 FPS. Try entering the same MOA correction in your shooter program at longer distances and check the velocity corrections.
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