Isnipe windage deflection Double JBM online calculator??

E

emerson

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I've gone through each several times. Yes, set JBM to zero wind deflection at the rifle's zero range because isnipe does that, also experimented with setting zero range of 1 yd for both. Same bullet displaying same BC. Yes, shooting at the range is only way to get absolute data, but my setup has enough error to make the data iffy, let alone the variable wind. The calculated drops of both programs are within 1/2"@500yd. Anyone dealt with this?
 
I'll second the spindrift setting.

But I also wouldn't be surprised if there were errors in Isnipe.
I've found errors on Isnipe before, 2 I can remeber. One was missing range/data. I can't recall what ranges but I had it set for data@25y increments, is simply skipped 2 ranges.
The other was duplicate data. Totally different ranges, exact same data.

I use ballistic now. I'm happy
 
Well, the difference is 13"@500yd. I considered spin drift but this seems to be a lot. My leaning is toward trusting the JBM output. I don't have a setup to reach out very far so not a huge deal at this point.
 
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