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Here is another mathhammer guide by Red Archer.
It lists blast weapons' scatter probabilities for different distances at different ballistic skill levels and teaches how to calculate the odds of a blast weapon shot hitting or missing its target.
Feel free to view and download the short PDF file here. I appreciate any feedback!
Cool. This is going to be extremely useful, 'specially the bit about the arcs for the scattering.
I've developed the theory on scattering arcs for deep-striking purposes (back in 4th edition) initially. If you're interested in that too (odds for reserves rolls, reserves rolls with re-roll, scattering, etc) feel free to have a look here (Mathhammer - the risks of deep-striking).
Thanks for commenting and always good luck with your dice!