I actually did some research on this not too long ago. It seems there are an equal number of people on both sides of this fence. For me, I decided to play it safe with the 165 grn. I think it is still a great round for personal defense and I can't see risking any potential damage to my handgun or myself by using the 180 grn, especially in cheaply made range ammo form. What does everyone else think? Check out this article before you post though. Just something to think about.
http://www.greent.com/40Page/ammo/40/180gr.htm
http://www.greent.com/40Page/ammo/40/180gr.htm