I shoot a 300 RUM with bullets that have very high B.C (.505 or greater). However, I see the various .338's are often preffered for long range shooting, I would assume because of the higher bullet weights and not B.C., which is lower than the heavy .308 bullets. What is more important for long range shooting, B.C. or bullet weight, and why ? This may decide whether or not I rechamber to 300 RUM or .338 RUM.