O.K. here is a question for those of you that have kept up with more modern designs of rifles. My brother-in-law bought a Remington 700 for my nephew. It is chambered for 300 win mag. He claims that it will soot other, smaller rounds as well. I have been around guns for 40+ years and did not know of a rifle round that could shoot something smaller the way you can shoot a .38 from a .357 . Please enlighten me. Thank you.