I have been shooting an accurized 300WM for 3 years now and am going to have a custom rifle built. Some people are telling me that I should go to a 300RUM. I do not know if it is worth the extra expense and KICK. I am hunting Whitetails in PA from 500 to 1000 yards. Occaisionally out west for mule deer and elk. Is there any accuracy improvement? Any help would be appreciated.