I was looking for a Pot Roast recipe for my pressure cooker. I found a number of them, but the one that came in my instruction manual looked the best! Some recipes I read called for bottom or rump roast, but a number of other recipes stated that these cuts were too dry or tough. A cut from the chuck (or a cross rib roast) a thought to be more tender. I made this with a 4 pound roast and cooked right at 1 hour. I put in red potatoes for the last 20 minutes and carrots for the last 5. I think I would do 1 hour for a 3 lb roast and 1 hour and 15 for a 4 lb roast next time.