I tried 300 during covid, but there was so little ammo available I could never find the right combo to work with the ar15 I had at the time. Rather than butting my head against the wall, I built an ar15 in 762x39 and bought up whatever of that ammo I could find.
This is great selection. All handy, nothing that can't be reloaded, and modern thinking. I would add the 357 mag/38 spec option as you can easily carry a snubbie anywhere. Or even as a backup to a 9mm, as they are great belt carry guns(9mm with 15 rd mags is good start). Quite a few guys mix a revolver and semi auto to stay current is skillset on range day. Also a hand off to a partner if the SHTF leaves him unarmed.Doesn't sounds like you've got too much consolidating to do, I'm sure most INGO members have a far longer list of calibers they own.
That being said, I am in the camp of having fewer calibers myself. There are a few that I think you could get rid of without losing too much versatility, which I'll list below, with my reasoning for each:
1 - .50 AE - I don't think this needs much explanation, as it sounds like your already aware with the "I know" comment.
2 - 7.62x39 and/or 300 Blackout - Speaking only of supersonic 300 blackout, these two rounds are extremely similar in ballistics and in what they can achieve. With 7.62x39 you generally speaking gain cheaper ammo, a larger number of firearms already out there that are chambered for it, and slightly better ballistics out of a full-length barrel, assuming you can get good quality ammo. With 300 blackout you gain the ability to easily switch to super quiet subsonic rounds, assuming you have a suppressor, and also the ability to go with a much shorter barrel length before you really start to notice your muzzle velocity falling off. If you have a 30 cal suppressor, I'd stick with 300 BO just to have the easy option of running super quiet subs, and ditch 7.62x39 since 300 blackout can basically achieve the same performance with supersonic rounds. But if you don't have a suppressor or aren't interested in running subs, just stick with 7.62x39 since the ammo is super cheap and there's already a ton of it out there. Or, you can just get rid of both; 223 really fills the same role, without a huge drop in performance at close range, and the added benefit of a flatter trajectory if you start to have to reach out there. And if you think you need more punch than the 223 can deliver, just grab the 308.
3 - 450 Bushmaster - At relatively close range it's definitely a harder-hitting round than 308, but unless you plan on hunting a critter that's larger than anything we have here in Indiana, that extra power is likely to just be overkill.
These are the calibers I would absolutely keep, no matter what, if I were you:
Rifle
.22LR - Perfect for varmints. Also, in a survival situation you can carry a ton of it, and it can even technically take larger game if you can get up close and take head shots. Not something you ever want to be using it for, but if you actually reach a point where it's hunt or starve, having a load of 22lr on you is probably going to be your best bet.
.223/5.56 - Seems to be in the goldilocks zone for rifle cartridges. The recoil is quite mild, it's a relatively light round, easy to have high capacity in a small package, powerful enough for self-defense and even hunting larger game, even if not quite ideal. Tons of firearms are chambered in it, it's readily available, cheap, etc.
.308 Winchester - Also an extremely common round. If you want to set out to hunt deer, this seems to be about the best cartridge you can find for having just right amount of power out to 300 yards. Plus it can be a more authoritative option as a self-defense cartridge than 223.
Pistol
9mm - Seems to be the goldilocks round for handguns, like the 223 is for rifles. Plus there's a ton of it out there, it's cheap, etc.
Shotgun
12 gauge - You can't ask for much better versatility in a firearm. I don't think there's an animal in this state that you can't get an effective hunting load for. Yes, you'll be limited to relatively close-range engagements, but with buckshot or slugs 12ga can actually be quite effective as a self-defense option, even out to 100 yards and a bit beyond.
The struggle is real...
We are in a generation of lots of stuff, in every sector.
