My rifle likes the 200gr ELD-X, therefore I like the 200gr ELD-X! Every rifle likes a different load so keep experimenting until you find what your rifle likes. I'm getting .5" at 100 and around an inch at 200 & 300 yards...this is more than sufficient for me with a hunting rifle, making the 1st shot and getting knowing that it is going to make its mark is priceless.
Anyone shooting 300 RUM is 99.99% using it to hunt long range...all the bullet's mention in this thread are capable of killing big game at long ranges.