I have been shooting the MRX bullet since I am in the Lead free zone of the state. I decided on the MRX bullet just because it made sense to me. It is modeled after a lead bullet ie tungsten core vs lead core and jacketed with copper. I have been successful with the MRX bullet but I have heard that many do not like the TSX. I was just searching on line and found this article on Bass Pros web site. Scroll to the bottom and read the post on the bottom. The MRX expands much greater then the TSX according to this persons post. Has anyone else had any experience with either MRX or TSX bullets? Glad I bought the MRX.