After reading the link that Gatoragn sent me, I have a better understanding of SAAMI pressure standards. However, after reading the information on the Hornaday website, I have another question: Is the 150gr 30-06 SST faster than the 165gr 30-06 SST simply because of F=ma? In other words, you get a better velocity with the 150gr SST but it will hit with less force than a 165gr SST? So wouldn't the difference be negligible since the 150gr SST is approx. 70fps faster than the 165gr SST?