[concept_8]

If you realy want to get the distance of bb travel correct don't forget to compensate for bb decay so to speak, (the farther from the muzzle the bb gets the more energy lost leading to a more rapid drop as it travels).
Without hop up it might be easier to compensate for decay or drop, but once you throw hop up into the equation the variables might just be infinite and way to much to precisely account for.

As it stands it looks like the numbers you've come up with are a generic bb weight+fps=distance which might be usefull in figuring out what distance one would acheive using different weight bb's in a single specific gun that is running consistant fps with say .20's.
I don't see anything dealing with specifics of the gun itself or the bb's for that matter though since from model to model and even gun to gun of the same model variables would change dramtically, and from bb brand to brand some changes are likely also.(size, material make up, shape,)

Even still though as a specific chart for a single model, you have a couple of variables to compensate for (harley's suggestions, decay, bb consistancy, and any more you can figure out like temp humidity ect. if you realy want to crunch out all the details) and it might end up close to precise.

Good luck n keep at it, n maybe in the end you'll have a usefull chart that can be helpfull for m700 owners and maybe even easily tweakable for other models also.