Hunter Nick I'll answer your question directly:
I don't believe there is any objective measure that can prove to me that the .223 (even with heavy for calibre 73-88gr fast twist bullets) is a legitimate deer hunting cartridge when COMPARED to larger calibres.
This is due to basic physics...the larger calibres outperform the .223 ballistically, penetrating deeper and transferring more energy. They are just superior in range, power, and penetration.
As you implied caliber debate is never ending... they are always a bit silly, and people rarely prove one popular cartridge is better than another. Different rounds have different purposes, and there is plenty of room at the table for everyone to sit.
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