I have two boxes here that say Grand Slams. They are a couple years old so I can't say they have not changed. I also don't know if they load more than one 150 grain bullet. Maybe the bid on bullets and use whatever they get the best deal on. I have only used the ones in the BLUE box. Check your local stores. These loads chronographed almost exactly as stated on thei ballistic chart on the box. This is not always the case. They clocked 2906 and the box claimed 2910.