From the University of Central Florida's National Center for Forensic Science, a smokeless powder database that could be as useful to people who reload as to CSI types.
Pushing the "Download Now" button doesn't download to your computer. It just opens the resource so you can use it.
Ignoring the form at the top of the screen, you can page down to the data...after page after page....
Or you can use the form and for example, enter "231" in the "Product Name" field and press "search". Winchester 231 appears just below the form.
Notice the blued "Sample Detail & Download Section." Click that and you get everything you want to know about 231.