Here's a link to the ballistic calculator I use. http://www.handloads.com/calc/

I got the bullet's ballistic coefficient (BC)from Hornady's product page. As Underclocked said, those published BCs are a big "if". But they are probably close enough to be useful for muzzle loader velocities and distances. If you play around with that chart and change the BC a few points one way or the other you will see what I mean.