Ive heard on several occasions that nosler made some changes to the ballistic tips since they were originally introduced. Ive not found a lot of information on when those changes were made. I recently purchased some 150g .277s and failed to ask if they were new production or old and ended up with some older stock. Was my own fault so not complaining. Based on another recent post i just had to know if they were the same. I cut an older one and newer style bullet and found they are significantly different. The newer style is on the left and older style on the right. You can clearly see the jacket is much thicker onear the base than the older style bullet.