Not being familiar with stabal match, I looked it up on the 2023 hodgedon burn rate chart. It's in the varget range, two powders slower than varget. Other powders really close are win 748,760, and h380.
Seems pretty fast for 338wm. At the very least it would be better for small for caliber bullets.....the 165gr-to maybe 200gr. I've reloaded 338wm for years, your typically getting into medium slow to slooow powders. ....4350, 4831, larger reloader #'s.....that class powder. Take a look at recommended powders from a few sources, find them on the burn chart. I'd bet stabal match is faster.
Not saying it wouldn't work. Just be careful and realize you might not get good performance.