Literally millions of rounds of standard 150 to 180 grain ammo was fired with absolutely no fuss long before "Garand Ammo" or adjustable gas plugs existed. Milsurp M2 ammo has never been common in Canada. It's virtually gone, Stateside, now too. Even the CMP is selling Federal 150 grain FMJ's with some Greek milsurp.
Talk to your local gun shop about ordering you some Federal. Expect to pay up front and remember that Federal brass is known to be softer than other brands. Only means it won't last as long.
That W.W. II vintage ammo is worth a pile of money to collectors. Moreso, Stateside, than here though.