I think @ingwe could answer that question very completely. Hopefully he’ll chime in.
OK, here you go. I have a sample of only a few deer with the Speer 70 grainer and I was not impressed ( at least not in a good way...) A close friend who I actually believe took over 23 deer with that Speer and loves it. There are no flies on the basic 55 gr.Hornady for sure, especially out of a .223
As to where to hit them...the same place you'd hit them with a .30-06
As others have mentioned there are a number of good premium type bullets for this but if you are hanging with the Hornadys,you aren't missing out on much.
