I have been doing the 10 x 3 for fat loss protocol applied to pullups and handstand pushups. I have worked up to 45lbs with the pullups and 20lbs with the handstand pushups. My back and arms have never been bigger or fuller. For context, I do tabatas daily for cardio, pavels 3-5 (5 x 5)with one arms and pistols on alternate days, and eat slightly above maintainence calories.
Definately go heavy and above 25 total reps for the best mix of strength and size.