I agree with you Newmexican Hunter, while its not a 6.5 Creedmore, I have taken 2 Gemsbok/Oryx both with 257 Weatherby, I have taken a couple of pretty large Elk with 257 Weatherby, 4 Audad 1 at 400 yds and some really nice Mule deer with 257Bee farthest shot was a Mule deer at 450 +/- and every one of them where bang flops, not all instant death but they couldn't go anywhere until I got to them. Not shooting the new 131 GR or 133 GR, all were 115 GR Noslers.I have mixed feelings on this topic. If i was you, and planed on not shooting past 300 yards, then id just keep shooting the 6.5 creedmoor. People say its too small for big game but my experience makes me wonder if this is true. In the last few years a friend and I have shot 5 oryx (probably toughest big game animal there is without question), desert big horn, bears, and a almost a dozen mule deer and they literally all died on the spot. A couple of them went 30-40 yards. Many were shot at 300-400 yards and 2 deer were at 625 and 725.
A question i have is this? Is the lung and hart tissue on an elk or bear any stronger then the lung and heart tissue on a deer? Of course not. Yes the cavity wall is a little thicker. I think larger calibers are more forgiving when shot placement maybe isn't ideal.
This all being said, i just bought a 300 prc! Ha ha
I have taken 2 large hogs with the 257Bee, since I rebarreled with the 131 Black Jacks and I must say at 3400 FPS with that projectile its much more effective than the 115's are, shot in the shoulder and they were instant death, not may hogs die instantly from shoulder shots, toxic shock syndrome is my best guess.
I have 338 Cal magnum, 30 magnum, 7MM magnums, .277 magnum, 6.5 magnum, and the .257Bee and I always take the ole 257 Weatherby, its just got the JuJu.