Wanted to re-post this here so it can be a handy reference:

This is Prilipin's Chart - considered the gold standard for utilizing volume and intensity in your training:

1RM% / RPS/ OR/ RR
55-65/ 3-6 /24 /18-30
70-75 /3-6 /18 /12-24
80-85/ 2-4 /15 /10-20
90+ /1-2/ 7 /4-10
RPS=Reps per set
OR = Optimum Rep Total per workout
RR = Rep Range per workout

Thanks Randy