Yeah, you know I'm with you on this. I do love the .243, just seems to telepathically go where it's intended, available and does the jobWhy not keep it simple and effective and choose a standard caliber?
If deer hunting and an occasional predator hunt is your game, I can't think of a better choice than the old 243 Win. Rifles - the absolutely near perfect Tikka T3X lite. You don't need a semi-auto for deer hunting.
The 243 Win is a true multi-purpose caliber. The one qualifier I must add is that I've never shot a deer beyond 200 yards with it, most being under 150 yards due to the terrain where I hunt.
I've been shooting the 243 Win since the late 60's and have taken deer, varmints and predators with it. It has never let me down if I do my part. With deer hunting like all hunting, it's all about shot placement and having the proper bullet with enough energy to make a humane kill.