Sierra, get the 300WSM, you will not be sorry. In fact the 300 WSM is outselling the 300WM from talking to gun buyers and sellers. As far as having chambering problems, I've never had this happen to my 300wsm model 70. I have 7 or 8 friends that hunt with the 300wsm and they all praise it's accuracy, performance and shorter action. This cartridge is here to stay. My 300WSM kicks the same as my 30-06 with better performance.