Rooshooter
Here is a link to the match 9 equipment list
http://www.northcarolina1000.com/match-9.html
No help there, people use everything Brandon mentioned & more (you'll notice I cleverly picked a match where I did well).
Thomas Ellington has been more than a regular winner with his 6mm Dasher. Chris Collins may be leading the club points again this year, and shoots a .300 WSM, Scott Fletcher has done a lot of winning with his .338s. Moreover, the Butner group is what remains of the old Hawks Ridge club; people who shoot there are quite dedicated, and have been at it a long time. "Been at it a long time" = more .30s than you might find a at newer club.
As always, it is barrels and bullets and good shooting. One thing I'll mention about match 9. We had short-range type wind flags, raised to bullet height, running down the center of the range at 900, 800, 600, 400 and 300 yards. Both Scott Fletcher & I admit we used them. Not like a short range shooter. For me, I noticed in the HG shootoff that the wind changed about 120 degrees just as the record period began. I waited until the wind direction changed back to what we had in the sighter period & ran my shots a as fast as I could. It was a seven inch group where the others were in double digits. It was also almost off the paper, but that didn't matter for a group shootoff. Scott Fletcher was the brave one, he actually stopped shooting when the wind changed, & resumed when the prevailing condition returned. I wouldn't have had the guts, but this time anyway, it paid off for him.
Brandon is in good hands with Leonard Baity. Leonard won't dictate chambering choice, but if you ask & listen closely, I'm sure he'll tell you his preferences.
It pays to listen. For example, suppose you wanted a .30. Leonard has an awfully good .300 Ackley reamer, and an awfully good .308 Norma reamer. If someone were to pick Dave Tooley as their gunsmith, he has a hummer of a .30 BooBoo reamer. (1) Both smiths have built a number of shooter-of-the year level rifles in these chamberings. (2) The .30 BooBoo has almost exactly the same case capacity as the .308 Norma.
So that's a tip -- pick you gunsmith & listen to them.