Dad
After years of bashing the .243, my Dad bought one to hunt groundhogs, which is what he believed was the calibers sole virtue. He shot it so well, that he took it deer hunting too. And lo and behold, he started filling tags, and missing less deer, than ever before. Turns out some practice, and a milder kicking rifle, let ol Dad shoot a good bit better than with the .270.
Dad's load was factory Rem 100 Core-Lokts. When the rifle came to me, naturally I loaded for it, and shoot 100 gr Nosler Partitions. Bamaboy and myself have taken half dozen or so with Dad's .243, and I cannot say it is any less of a killer than something bigger. Bamaboy especially seems to excel in bang-flops with the caliber!
My view is that the .243 is the perfect venue for controlled expansion bullets, ie Partitions, A-Frames, AccuBonds, etc. The Core Lokt is not a bad bullet either, and we have recovered a couple from the off shoulder. But we have not recovered a Partition, all pass through's.