One of the best load sites i have found is one that Ouickdtoo turned me onto , Ammo Guide Interactive , it has links to all the major power companys load data as well as over 11,000 loads for 509 cartridges .
Granted you should always check loads from the net aginst the powder companies data , but this site lets you do this .
It also has a ballistics calcuator and a way to compare ba;;istics between cartridges , plus much much more .
Not a bad deal for $15.00 a year .
stimpy