i'm not talking 1 rep max, i mean something like 10 rep max, say for example on barbell curls
so could one go from curling 185 for 10 reps til failure to curling 135 for 10 reps til failure and get bigger biceps?
Sure, but you need to take into consideration that there are MANY variables. When performing say ten reps with 185 is that person curling that bar in a strict fashion? He is cheating at the end to go past failure? Is he cheating to make it easier or is he cheating to make it harder? How long is he resting between sets? What is his rep speed and does that rep speed change with each rep? Is he using PED's and if so was he using both when he was curling 185 and 135? Point is that because of these variables it does not allow us to know for sure. I can tell you this, I have taken people who have lifted long rests and heavy weight and cut down their rest time and obviously their weight and they have gotten bigger. All that is needed for a muscle to grow is to stimulate it. It's been said before that a muscle have no clue as to how much weight it is using and because of this the muscle can keep growing to a certain degree without increasing the actual weight on the bar.
Also powerlifters don't do 1 rep max all that often. They train with reps just like other lifters do. It's only when coming close to a show that they start to low their reps.