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.391 is too high unless your running a sub 1 in 8 twist. Typically you want to use the mach 2 or 1.75 given BC as a start with the ELDs for any sort of range. For the 180 and a 1 in 8.75 that's 0.364...

What bc are you using? There's multiple listed based on speed twist and range. Labradar is 1% accuracy so could easily enough be 25fps out.