?? Why ??, I've always crimped my rifle rounds. Up until now, all my bolt gun work has been done with a .308, in the field, the rounds are in a hard case to prevent alot of unnecessary impacts. The .338 being a much longer round, rounds are carried in a smaller, numerically speaking, case. I would be concerned that I may not be able to treat them very delicately most of the time. For this reason, I had thought to crimp them as an added level of insurance from tactical OAL modification. Heck, I've had .45 ball to a tactical OAL mod on me in the field. From the bench, the .338 works well from 600 meters and beyond and packs a nice payload. One does not always have the luxury of a stable concrete bench, hot coffee, donuts, etc... I've heard arguments that crimping degrades accuracy, this may or may not be true, from the golden rectangle perspective, I doubt that crimping would be much of an accuracy trade off in this scenario. So...that is my thinking on the "...why...", now, I ask you...Why Not?