Border locked down? That's a new one. The guy in your local gun shop is pulling stories out of his ass.
Alliant has been having a lot of issues getting powder anywhere. Even US retailers are often sold out. There are several rumours flying around as to why:
-Obama signed a secret order to restrict powder to Canada
-Alliant is sending most production to retail ammunition manufacturers so only a trickle gets into the retail market
-US government agencies are getting ready for the apex of the global banking conspiracy where they kill off 99% of the worlds population and take the remaining 1% as slaves; they are stockpiling powder for this
-the Alliant factory burned down and there is no more Alliant powder
-Alliant's export licenses expired and they can no longer export powder to Canada
-Alliant is filling domestic back orders as a priority and have temporarily suspended foreign orders
-Canadian importers and retailers have fabricated an artificial shortage so they can increase prices to get massive profits
As far as I have found anywhere, no single story has been confirmed by ATK or Alliant themselves. Most sources are saying late 2015 or early 2016 for regular orders of Alliant powder to Canada to resume.