I have a chance to pick up an R700, there are two of them for sale down the street in great shape, both identical except one is chambered in .30-06 and the other chambered in .338 UM. So I can’t find much info on the .338 UM … the only thing I could find is that is has roughly 4.5 times the recoil of a .30-06. I even wiki’d, googled, etc the .338 UM and still found next to nothing. So what are the differences between a .338 UM and a .30-06? Pro’s, con’s? Also I found nothing on this site with the search term .338 UM ... is that the same as the .338 Lap-something? Thanks for the advice and answers.