Missouri has a few reloading product manufacturers that I'm aware of and a few of them also have walk-in sales. Here are the ones I know of but please feel free to list any others.

Sierra Bullets - Sedalia MO - Outlet Store open to public
Starline Brass - Sedalia MO - Unknown if they sell at the factory
Missouri Bullets - Kingsville, MO - Can buy at factory but they recommend calling first

I remember a place on N. Broadway near downtown St. Louis that sold pulled bullets, brass and some other bulk components.  I haven't been able to find any information on them so it's possible they are no longer in business.

GRAFS in St Charles

DUNNS in Peavley

Those places are dealers and retail operations.  I was more interested in seeing if there are actual manufacturers in MO who might also sell direct to the public.

The place on Broadway in STL is Hi-Tech Ammuntion but they moved out west of the city. They're still in business and have a website. Just search for their name. It's new guys running it though. Still good people from what I can tell. They delivered an order to me one time when they were in their way to a fun show. Met them at McDonalds. Saved me shipping and hazmat so I really appreciated that.

oh yeah

good guys

http://hi-techammo.com/

i still have a bunch of pulled 762NATO and jugs of WC846

Missouri Bullet Company has given me a pretty deep discount when I've paid in cash in person. Might be because I'm so charming though.

Great info!  Thanks.