You should be fine. You will need minimum 50 rounds on Sunday if there is no reshoots needed. The rest all depends on how long it takes you to sight in. Do you know your rifle well, or are you going to spend a lot of rounds trying to get dope for your rifle? 200 is strongly recommended for new shooters with no dope. I usually don't use more than 100 for the whole weekend.
Cheers
Dave