Welcome to the reloading board. Pull up a rock and set a spell.
Yup, loading slugs have been discussed a few times recently. Scan the last 3-4-5 pages and you'll see several slug loading topics.
So as not to reinvent the wheel too much, you might wish to go to
http://data.hodgdon.com/shotshell_load.asp and select 'Lead Slugs' for load type, then look around the various powder, primer, wad and hull options.
Whatever loading manuals you have: LYmans, ABCs ... have slug data too. Lee and Lyman have data, also, and there is always Google.
GS