Use 70 % of maximal load; go to concentric muscle failure; then do 2 or 3 forced repetitions with 15 % more weight. (strengthsensei.com)
One of the methods these athletes use to achieve such hypertrophy is the combination of lifting maximal loads (1 - 5 RM) and fast eccentric training (plyometrics). (strengthsensei.com)
Adequate rest is needed between sets when working with near maximal loads. (rosstraining.com)