Westicle said:winchester makes a 64gr load specifically for deer....
.223 is fine for deer when used in its element and within its effective range and picking your shots....... before 1890 they used black powder for everything and it is a lot more weaker then a .223 will ever be.
I'd take an original 45-70-405 equivalent - 405gr @ ~1400fps - for deer over a .223 any day.