With an average UC capped weighted GPA for 2018 at 4.23, anything below a 4.0 will be a Big Reach even with a competitive ACT. UCLA tends to be very GPA focused.
25th percentile for OOS Fully weighted GPA was 4.42
2018 Freshman profile: https://www.admission.ucla.edu/prospect/Adm_fr/Frosh_Prof18.htm