I too have X-Frame grips on my Lew Horton M629 Magnum Hunter. At the time I ordered mine, the S&W website said they fit round butt 629s. Don't know iffin they changed anything but the product description since, but I love 'em on mine. Much better for woods usage than the wood stocks that came with it, especially with heavy hunting loads. My 629 likes 240 grainers and they also seem to work the best on our Wisconsin Whitetals......at least for me.