I may be able to stop by KCR in a couple weeks.
I’m looking for surplus powder, sized surplus bullets, primers and maybe a few loaded rounds of M33 and some higher quality projectiles.
I know Pats is a good source for this stuff, but are there any other vendors I should keep an eye out for?
I’ve been to the Creek a few times before and know my way around, but never was looking for .50 reloading stuff.
Thanks!

Try finding Jerry Hazlet of Amer-I-can Enterprises.

He is an expert we FCSA shooters use for reference.

Jerry did sell a lot of his stuff after a serious (health scare).

He still is able to deliver a heap of info about the 50BMG.

You should be able to find surplus 50 powder from 2-3 vendors as well as primers. Scarce though and not the bargain they used to be. Surplus pulled bullets are very scarce. Maybe one vendor, maybe two will have any at all. Very little loaded 50 BMG remanufactured ammo. Gone are the days you could buy skid loads of surplus components or remanufactured 50 ammo. Still a good show, just be aware you'll not see much surplus bullets and powder. Check the vendor across the road from the covered sheds where Pat's Reloading is located. (behind the clubhouse) He has tables with ammo cans with various bullets. Best chance to find M33 ball at his tables and maybe powder.  Bartlett from GIBRASS is often beside his tables with powder.  The Hi-Tech vendor may have primers and powder? You will probably see some API 50 pulled bullets which are less popular as they can start fires and not allowed on most ranges. Sorry for the depressing report but it's gotten worse every year from about 2003.

Thanks for the info guys.
I’ve checked out Pats Reloading at KCR before but didn’t buy any .50 stuff because I wasn’t looking for it at the time.
It’s nice that most vendors there are in the same spot every year.
I do remember the days of pulled Bullets and powder being much more common and cheap years ago, but better to get into the game late than never.