For me, if ever the chance comes around, I'll be using my 7mm rem mag.... Because it could be the only elk hunt that I experience.
However it's no ones problem but mine, why I choose the calibers I choose. I could see being a proficient enough shot to use a .243 win to take elk. I don't use a magnum because I'm not competent, I use one because I'm proficient with my rifle.
Truth be told I really think my .270 win is all I need to take elk cleanly. I've been reading for years how they do a nice job on elk. (my .270 is alot lighter than my 7mm rem mag)
The op did a nice job taking the elk, saying that the penetration from the 100 grn bullet was satisfactory......... what more can you want!?@#$%&