[BigFrank]

Low reps do build strength but they also build muscle. Size and strength normally go hand in hand to some extent, especially for beginner to intermediate lifters. Not until lifters usually get to an elite / pro level do the glaring differences start to occur. Look at the past Mr. Olympia's and how they train. Main exercises should be done low reps. The muscle has to be broken down and then repaired for size to occur. What do you think does that better?

The whole powerlifter / bodybuilding physique difference is from training but not as much as one would think. It is more from dieting and drug use differences.

Without getting too winded here the big difference is bodybuilders do everything in volume and powerlifters train what is needed to get stronger. Where as a bodybuilder may do 12 sets for biceps, most powerlifters just do enough for them. Which with that said a lot of powerlifting is technique. Bodybuilding not so much.

Guess the bottom line here is, if your not going heavy in the gym because your bodybuilding, you're cutting yourself short. Still gotta bust your ass to get stronger or bigger.