I love my .243 too. It's a lovely Sako Aii that I picked up from TradeEx just about a year ago:
I hunted with it last season, walking the logging cuts here on Vancouver Island,
and although I wasn't lucky enough to see a blacktail buck (
they call them the 'Ghosts of the Pacific' for a reason),
it sure was a joy to carry.
Other posters have mentioned the inherent accuracy of the .243 and I have to agree.
At 100 yds, my lil Sako wants to put cheap Federal Powershock 100 grain soft-points into the same hole.
So yes, there's a lot to like about these cute lil rifles ..
Having praised the .243 however, if I ever win an elk draw then I'll use either my .270 or .308 or .30-06
Yes, the .243 might do the job .. but my other gals in the safe need to feel useful too .. lol.