thanx a lot for the advice. i appreciate it. Is the ballistics coefficient calculated with the length and the diameter of the bullet or is it something more like the density of the bullet mass/volume. i'm not opposed to trying different calibers. like i said, i'm starting from scratch. only reason i ask is beause i don't know. maybe i guess i'm asking is, the smaller the bullet the less effect the wind drift/wind resistance has on the theoretical flight of the bullet?