My opinion:
Taking a long action and making a short action shell fit it is working exactly backwards, so I would reject the 284 and all wildcats based on it. Same with all shells based on the 308. The 264 was made by Winchester to get close to the 270 but fit in a lever action or auto. It did that by using a fatter shell with a rebated rim to get very close to the 30-06 size shell. You have a 30-06 size action...........so what is wrong with a 30-06 base shell?
The 280 is very good as is the 270, and the 25-06 for that matter. If wildcatting is your cup of tea look hard at a 6.5-06.
I have several friends that own the 280 AIs and none of their rifles have actually impressed me enough to make me consider owning one. Seeing kills on Antelope, Deer and elk, none of them are any better then the kills I have made with my old 270 and in a few cases, not as good (probably because they drank the cool-aid and just had to use a target style bullet instead of a better made hunting bullet for their hunting)
Sure they work, but the pain in the neck needed to make brass and fire-form it is more then what ballistic advantage it gives is worth ---- to me anyway. You can buy Nosler 280 AI pre-formed, but not as inexpensively as you can get standard 270s and as I said, I can't see ANY advantage of how the 280 AI works in the field over the standard 270. (or a standard 30-06 either) And yes, I have seen them side by side on several occasions.
If I wanted to work on feed lips a bit and take 30 minutes to open a bolt face and extractor I would make a 7MM Rem Mag Mag long before I would make a 280 AI. The AI will hold one more round and in some actions 2 more, but I see no true advantage in that for a hunting rifle. That's just me however.
Anyone that thinks "AI" is thinking about extra speed, and the belted mag gives you that (and a bit more) with no pain in the neck hoop-jumping.
I have owned a lot of different belted magnum rifle in my life and I still own a 300 H&H and a 375H&H, both of which hold 3 in the mag, and both of which have never been shot empty in the game fields. Thinking back, I have never shot a belted mag rifle empty in over 50 years of hunting.
I do make as large a mag capacity as possible if I can, (example: most of the 9.3X62s I make) but that is just if I can for the reason "why not"....but I hunt with flintlocks and many times a Ruger #1, I don't actually have a need to lots of rounds in a hunting rifle. Again.........that's just me.
Lots of folks like to be the "real expert" by having something that is "unique", but in the real world, for deer, you probably could not make a better deer rifle then a standard 25-06. the 270 and the 280 hit harder and toss more bullet, but they don't kill a deer any better then a 25-06. Elk and bear.............those may be a reason I can see opting for a heavier bullet, but not on deer to be honest. Unique doesn't mean better. Not at all really.
I have killed more deer than I can count with 270s in the last 1/2 century and I also own a 25-06 with which I have killed about 25 deer and antelope combined in the last 15 years. Hit for hit, comparing bullets of good construction, on deer size game ....I can't actually see any difference at all.
The 25-06 kicks a bit less too.