Big Tex mentioned in the Programs section something about working with 70+% of your 1RM, but I dont know how much volume at this intensity is needed
70% is fair estimate, personally I just go by rep totals. For example: I make sure to perform at least 2-3 multi-joint core lifts at 4x6-10 at the begining of each training session. I figure if I'm reaching muscular failure around 10 reps or less I'm probably getting enough tGlut translocation. Busting out 15+ reps each set will most likely not be heavy enough.Just my opinion based on a couple months of experimentation.