From keepandbeararms.com

Also means one most likely could not bring in rifles in the below calibers for hunting.--------------------------------------------------------------------------------

No U.S. Ammo in Canada?: Politics and Pistols, Pt. 2
Submitted by: Bruce Krafft

Recently], we reported that Canadian authorities had sent word of a United States State Department proposal that would ban several ammo calibers sale by United States companies to Canada. ..."

"In Canada, calls to their Parliament protested the idea that whole classes of ammo could, effectively, be stopped at the border. ... The intent of the story was simple - to let our readers know the United States Department of State was considering a ban on the export of US ammo in several calibers ..."

"Although the .50 BMG, 7.62 x39mm Soviet, 7.61 x51 NATO, .308 Winchester, 5.56 NATO and .223 Remington are considered by some to be purely military rounds, they are, in fact, very effective for hunting anything from varmints to polar bears. ...