I have hunted white tail in NH for 15 years, and have many under my belt. I have NEVER had one go more then ten feet with my 30-06, yet I had to track a 170lb buck for hours with a .243 hole through it's lungs. I am not sold on .243 deer performance. A 100gr Nosler BT was ineffective in my eyes. It penetrated and expanded through to the hide on the far side, yet failed to anchor. Maybe smaller deer in other parts of the country, but on NH white tails I will never use a .243. That was the most miserable day I ever had hunting, and my Dad had warned me of the .243 being ineffective. I am not saying it is not a good choice for others, but I will stick with the .30's or a screaming fast 6mm.
But as far as smaller prey goes, the .243 is awesome. I love pink mist, and it provides plenty. A .30 is gross overkill for coyotes and other NH pests, but the .243 will anchor them on the spot. And I have done a bit of woodchuck shooting in some rather large corn fields, and the .223 isn't half the fun the .243 is.
If the recoil is too much, use a padded vest. I see no problem with the little recoil that it gives. And I am not a big guy by any means, 5'9" 180lbs. I put 100-200 30-06 rounds downrange almost every range session, and then shoot clays. I can shoot .243 all day long with no extra padding and have no problem. Yes, it kicks more than a .223. But in my opinion the .223 has zero recoil. Yes the gun moves, but it doesn't kick.
And yes, launching a PD or woodchuck 10' in the air makes it more dead in my book, well at least more fun to watch. You don't eat PD's or chucks, at least I don't, so what difference does it make if the kill site looks like ground zero? I have seen chucks crawl off from taking .17HMR and .222,.223, and .22-250, and good hits at that. I have yet to see a a chuck even try to crawl after a solid .243 hit. I even bring my 06' at times, as it is semi-auto and I can level several in short order and the carnage is just awesome to watch.
I am not saying the .22's are ineffective, only that I prefer to get the job done right and get it done every time. 6mm's get it done on small stuff like a .22 never could, with the exception of maybe the .220 swift as I have never seen one in action.
I see no relevance in stating the .243 isn't an ideal varmint round. I feel it is about the best going. If you want to get by with the bare minimum, then by all means go right ahead. Just don't try to make the .243 out to be overkill. It is used by many, and loved by most that use it.
Yes a smaller round will do, but where is the fun in using the bare minimum? My car(RIP) had 500hp and ate a 10lb bottle of NOS for breakfast, did I need it, or the ability to go from 0-60 in 3.5 seconds? NO. Was it fun as hell, you bet your ass! It may have got 6-8 MPG, but it's fun per gallon was off the chart.
I see that as the same as cost per round. If it cost a little more to have ten times the fun, than it's worth it all day long.