I heard they beefed up the BT. But I do not know if it is true or not. I really like the 165 BT in a couple of my 30-06's for deer. They do a great job on deer. about 4 years ago I found a close out on the 165's and bought 40 boxes for my hunting load. So they will last me the rest of my life on deer. I really like them. I also load them with RL22 in my 30-06 with a load I got from the Nosler web site. Tom.