The only ammunition that you can take home
to Canada is that ammunition which you imported - with you, from Canada - under the authority of a
Form 6NIA.
ATF
<http://www.atf.gov/>
DDTC Homepage
<http://www.pmddtc.state.gov/>
<http://www.atf.gov/>
From Huntington Die Specialties:
"We will export in any place in the world that the United States Department of State will allow us. There are restrictions concerning ammunition components. We must apply for an export license. This takes from 30 to 60 days. There is a service charge of $250.00 for processing the export license.
If your country requires an import certificate, we will need the original or a certified copy of the original certificate. If your country does not, we need an original letter stating your country does not require an import certificate. This letter must be stamped with an official government stamp."
Canada Customs might charge GST on declared brass. I've never heard of the Canadian government requiring an import licence for metallic reloading components, at least not for modest amounts that are not for resale.
It's taking it out of the U.S. - i.e. exporting, that is causing all the grief. It doesn't just apply to U.S. companies. In theory, even if you drove across the border, picked it up and drove back, unless you had the licence, you could be charged with exporting without a licence if you were stopped.
What is new to me is that the U.S. govt requires anyone exporting
brass to have an appropriate licence. Five-ten years ago it seemed that only items used by the military were under such restrictions. So M1A synthetic stocks were taboo, but Swedish m96 stocks were OK. Now it looks like the shyster lyers have sharpened the definition....