Many lifters learn the bench press from powerlifters. And powerlifters certainly know a lot about it. But remember, their goal is to lift the most weight possible for one rep, and they often use special lifting shirts.
If your goal is to build size as well as strength, and you lift raw (without a stretchy lifting shirt), then your pressing form will be different. Here's a quick video lesson.
Dave Tate is the co-owner of Elite Fitness Systems and has been involved in the sport of powerlifting since 1982. A true testament to his skills rests in the 10,000 hours of personal training and strength consulting sessions he has performed with novice to elite athletes. Numerous clients have broken barriers they never thought possible through the use of maximal, dynamic and absolute strength development methods.