Lots of "freedom" this year, so round count is hard to nail down. Bring 2x the amount mentioned above (rifle 200, pistol 150, birdshot 70, slug 5, buckshot 15) to cover your options.
Here are my numbers for the match, but I decided to use the pistol much more than the shotgun, so your mileage may vary. For the record, I'd say my abilities are average:
254 Rifle
249 Pistol
69 Birdshot
0 Slugs
5 Buckshot
Ryan