Al, that ballistics BS and theory means diddly squat except on paper only.
Shoot what you want, but the the key is to SHOOT !
At some point the trigger is going to have to be tripped , and then alll the thory goes out the window if the shooter is not caable. THAT is the biggest factor in ant cartridge.
The real world differences between the 243 and the 6.5 Creedmoor is diddly squat when it comes to a 300 yard deer kill, personal choice is just that .
Either cartridge will be fin, it's the personal choice that will be the biggest factor
Cat