Here is what I do. I use the data websites from powder manufacturers first. All of them have a good deal of lead bullet data. They want to sell their powder to us too!

I have lots of old manuals too. They are chocked full of lead bullet data.

The Lee manual has a bunch of lead bullet data.

Mike's pages are good to.

I have a subscription to LoadData.com and most of the articles for handgun handloading employs lead data. Brian Pearce is the on of the main writers there and he always includes lead bullets. He is also a caster so.......

There is an electronic reference I use from time to time and it is free. You can find it here: Reloaders' Reference | Download Reloaders' Reference software for free at SourceForge.net

It has the ability to store your data too. Has search functions and other pretty neat tools. It has a BUNCH of firearms manuals and printable targets too. Did I say its free too?