If the .243 is an Elk killing machine with 95 grain bullets,why wouldn't the .223 with 60-62 grain Nosler and Barnes not be also?

62 grain .223 Federal Fusions penetrate 15" in ballistic gel and I would expect the Nosler and Barnes to go farther.

So why not the .223 for Elk or is the .243 the lowest caliber lethal to Elk without a head shot?

Jayco