I'm not sure if this is possible, but at this time, the ammo shortage isn't really in effect in Canada. As Canadians, we can import 5,000 rounds at a time from the US, although most people don't bother, because its cheaper here. Some however do get, specialty ammo that's not readily available in Canada. It may be worth investigating to see how much you can take back, if you made a trip up here.
If you come up, try the poutine, ....... Just a suggestion..
one last point, there's very little HP pistol ammo available, but scads of rifle stuff.