I have to admit similar practices. I have a pretty good collection of reloading manuals, plus Handloader magazine writeups on cartridges I am interested in. A little common sense goes a long way. My benchmark is an old Speer #8 manual. I have always felt that it has been the very reliable source for maximum load data. However, as it is getting so old, many nwere powder are not represented. Interestingly, I bought a couple pounds of IMR 4320, & IMR 4064 this morning, so some things have not changed to much, well, maybe the price.