So having checked pretty much every on-line reloading supplier in Canada with the same results as everyone else, I thought "Why Not" and dropped a note directly to Barnes.
"Hi Folks
I am sure you get this question about 50 times a day (or more)
I live in Canada and as far as I can tell there are no .308 x 150gr TSX or TTSX projectiles available anywhere in the country
I have contacted every vendor that I can identify
Do you have any idea when you might be catching up on backorders?
Thx"
They replied - good news in itself and it didn't appear to be a completely canned reply although aimed more at the US market...
"Thank you for shooting Barnes bullets.
We are currently running a sizable run of the .308 150 TTSX.
As you can hopefully understand our industry is backlogged at unprecedented numbers. Our employees are getting lots of overtime as we are running our bullet and ammunition making presses nearly 24/7.
Several things you can do. The best advice I can give is to check in to our online store to check availability.
https://www.barnesbullets.com/
Next, get yourself on email waiting lists with several, if not more, online retailers such as Graf & Sons, MidwayUSA or Natchez Shooters Supply as well as a host of others.
Next, take a look at these two sites
https://ammoseek.com/ or
https://www.gunbroker.com/
Hope you find what you're looking for!"
Who knows maybe some will leak north of the border