I know Ancestry has them for 1850-1880 but were there mortality schedules for 1900-1930, too?

I've never seen any other federal ones except the ones you mentioned. The state of Florida had one for 1885. Ancestry has lumped that one in with the 1850-1880 census records but it is actually 1885. I have notified Ancestry of their error more than once but have been ignored. In my opinion, errors such as that by Ancestry are usually not acknowledged nor rectified.

They tell you that's there, as well as Colorado.

"In addition to the Federal Mortality Schedules, this database also includes Mortality Schedules from two State Censuses – Colorado and Florida – from 1885."

You should always read the "For more information about this database" section.

This link gives a great deal of infor on federal and state mortality schedules.
http://www.newhorizonsgenealogicalservices.com/mortality-sch...

Thank you for that link, it's full of information.