Sighting in your Rifle.

Federal Cartridge is the best place I have ever found for this info.

http://www.federalcartridge.com/default.asp?br=1

Go to the website. At the top, click on the ammunition and ballistics banner. On the next page, click on the open ballistics catalog in the upper right box (pop-up opens). Select gun type and select all uses (just gives you everything possible). Find your ammo and it gives you all the choices Federal makes and ballistics for each (shouldn't vary enough from other ammo to be of concern).
Sorry I couldn't get the link straight to the catolog (it won't show on my computer).

Rob

There are a couple PC programs for ballistics that will give you a very close calculation of your trajectory. You need to input the height of the scope or sights above bore center, the muzzle velocity, and the ballistic coefficient. Then pick an arbitrary range for your second zero point (some will work with initial zero, as well) and it'll give you the deviation from line of sight at all different ranges.

My son has one; it's quick & easy to use, and DARN close, but I don't remember the name. It also has a data section where you can enter all sorts of load/velocity data, and it prompts you so you don't forget any of the entries.