Could be a interesting topic for sure, I’m a long time bow hunter(over 35 years) and a powder burner so all this airgun stuff is new to me within the last 1.5 years due to my health issues and I’m learning as I go but one thing I have found out is if a person is going to shoot BIG BORE airguns you need air, lots of air, I now have 1 small and two big air tanks and a AV compressor.
Big Bore = Air, lots of air, .30 not to bad depending on airgun, .357 is getting into air usage but you get a few good shots off a fill then you have .45 caliber which uses a lot of air and then the 50 cal YIKs, most folks that shoot big bore will have bigger air tanks and they can fill faster then the smaller compressors do plus they get more bench time, but then again everyone is different. I have five big bores now, two 30’s, two .357’s and a .45 and I practice a lot being I don’t have to worry about air, I can now hit my 5” AR500 plate at 100 yards no problem, I also practice a lot shooting the 2” and 3” plates at 100 yards with the 30 and 357, all my practice shooting is between 50 and 100 yards and I now feel confident shooting those distances with all my airguns.
What are you planning on hunting the most? if your going after coyotes then a .30 or .357 will be fine out to 100 yards ethically but then there are guys that hunt yotes with the 25 caliber and they are dispatching them with head shots but to me that’s to small of caliber for yotes I feel better with at least a 30 cal but I like the .357 Texan better, it has a good 100 yard punch and I believe it will take a deer out to 100 yards also then you have the .45 and .50 cal which are good for most big game animals if your shot is close enough to be ethical.
My state of Mn isn’t to airgun friendly YET so we are really limited to on what we can shoot/ hunt with airguns.