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Impact @ 200 after 100 zero

 
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  #1  
Old 03-29-2013, 08:04 AM
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Impact @ 200 after 100 zero

I have developed a load for a 300WSM w/210 berger & 58.5 grains of H4350.
I have very good groups.
After Shooting a group @ 100 yards, with my same aim point, my impact @ 200 was 9" when it should of been 4.7" according to my bulletsflight app.
Am I overlooking something ?
Thx!
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Old 03-29-2013, 08:10 AM
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Re: Impact @ 200 after 100 zero

Whats your scope?
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Old 03-29-2013, 08:46 AM
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Re: Impact @ 200 after 100 zero

I have developed a load for a 300WSM w/210 berger & 58.5 grains of H4350.(Irrevalent)
I have very good groups. (also does not pertain)
After Shooting a group @ 100 yards, with my same aim point, (which is what???) my impact @ 200 was 9" when it should of been 4.7" according to my bulletsflight app.
Am I overlooking something ?

If you are using center bullseye as your aim point I dont wonder at all why you are low at 200. Even with my 22-250 at ungodly speed I have to aim ABOVE the center of the bullseye to get on at 225 yards,,,,and it still just a touch high at 200.

Give full data on the load
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Old 03-29-2013, 10:12 AM
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Re: Impact @ 200 after 100 zero

Are you shooting uphill or downhill? It matters.
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Old 03-29-2013, 10:35 AM
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Re: Impact @ 200 after 100 zero

Quote:
Originally Posted by bbutturff View Post
Are you shooting uphill or downhill? It matters.
I got it backwards. This would make your point of impact high, not low.
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Old 03-29-2013, 10:47 AM
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Re: Impact @ 200 after 100 zero

I think what is he is saying is that he did not adjust for 200, he shot it as 100 to figure out drop. Drop was 9" vs 4.7", 4.7 being the expected result.

So, IF I am correct then that means your data is wrong. For example BC, atmospheric conditions etc. My guess is that your velocity is wrong and is likely several hundred fps slower than what you input.

What is relative to the equation I think is what expected velocity did you use, how did you come to that conclusion, and did you chrono the loads?
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Old 03-29-2013, 11:05 AM
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Re: Impact @ 200 after 100 zero

Chronyed load. Flat ground. 2550fps.
Changed g7 to g1. No diff. Correct BC used.
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