Range Report Site for ballistic comparisons between calibers?

Veer_G

Beware of the Dildópony!
Full Member
Minuteman
Jun 15, 2008
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SEPA
Is there a website anywhere that has comparative trajectories for common calibers, or maybe a function that will throw up a graph for you with a few bits of data entered in? I'm optics shopping and most of the glass with BDC is strictly 5.56 and 7.62x51.

TIA!