Tyler, your post #7 is excellent logic.
Here in Ohio we can only use airguns on small game, we can’t even use them on turkey, which would be easy.
I small game and pest with .22, .25 and .30. For me, even if I could deer hunt with a .357 or larger I probably would not. Nothing against anyone that succesfully uses them. Archery in Ohio goes Late September to about first week in Febuary, that’s a long season. I have yet to use a PB during “gun week” to take a deer. I get it done with archery. I like to get one deer in the freezer and get it over with as soon as possible so I can get back to small game and my year round pesting permissions.
I sort of compare airgun hunting to fishing for yellow perch and walleye. Yellow perch fishing is flat out fun when you find a honey hole, just like a good squirrel area in the woods, you have a decent bag limit (especially pesting) and some good trigger time. Deer hunting is more like walley fishing, you put in a lot of slow boring trolling time but the reward can be awesome and the bag limit is lower and you can fill a freezer quicker.
To each his own. Economics plays in too. .22 pellets are very economical especially if you like to shoot a lot. .25 gets expensive quickly, .30 is even more expensive. .357 and larger isn’t a good choice if you’re going to plink, but your budget will dictate that. And plinking a .357 has a very low shot count as well.
As much as I would like to get a deer with my .450 Bushmaster, I’m entirely happy with my archery success and to be honest I can deer hunt in much more pleasant weather. I have many many hours in trees in crappy weather and much prefer pre-November where I can have crisp mornings and pleasant daytime temps. To me, because of the cost of a decent larger game air rifle for a one week season, it’s a poor investment.
If you do go the big game route be sure to shoot in fair weather and cold weather to learn how cold weather affects yout POI so you’re confident of the proper aim.
Good luck.