Thank you metengr. Is there a resource you could suggest? I'm sure there is a reason, but all of the calculators that I can find do not recognize Chromoly. I am guessing that this is probably because it is not a stand alone alloy.
If you cannot find density for a specific alloy, look for properties of a more popular alloy with similar composition. In this case, 410 stainless. The ferritic and martensitic stainless steels (and even the austenitics) do not vary much from the 0.28 lb/in3 of carbon steel.