Hodgdon does not make any of their powders at all!! Most of their powder is made by ADI (Thales) out of Australia and a few powders made for them by St. Marks. and are re-branded with their H number. Here is a link to Hodgdon's web site, as you click on whatever powder you are interested in, a pdf file will open up and it will show who made the powder for Hodgdon. IMR is made in Canada and still makes their own powder with the exception of one or two as shown on the msds sheets on the link below. For example, look on your can of IMR 4227, mine says manufactured in Australia.
http://www.hodgdon.com/msds.html