I disagree. Even my tiniest of hatchlings don't get pinkies. All my hatchlings' 1st meals are rat fuzzies or hopper mice. After a couple of meals, they get either rat chubs or small adult mice for the next couple of months.
I'd start it on rat chubs if it has had a couple of meals before you bought it. If you are feeding mice, I would offer hoppers or small adults. My small bee only had 6 meals before I got him, and I fed him a small mouse the 1st week, and 2 small adult mice every 4 days since. Pinkies are almost always too small for BPs, unless you hatch out twins.