RE: Deer with .243
Here in Oklahoma, the deer are smaller than your Mid western deer. The .243 is used here and to good effect. With quality bullets and keeping the weight at 100 grains or more it works dandy here. I believe it would be OK and ethical IF THE SHOOTER DOES HIS JOB! But I like to have a little safety margin. What if your only shot is a quartering away shot? What if you only have a moment to fire? If you only go through one lung, you will be more likely to find you deer if you are using a 30 06.
But a lot of deer are killed with the .243. Just not by me
okcmco