@0 I would select 1 rifle in 5.56 or .308 and just train and shoot as much as possible. It’s better to take classes and get shots down range than own guns. Make it as all purpose as you can. And then buy a second version of that weapon platform so you have spare parts and maybe an extra barrel with different length
@0 Why would I buy two caches of ammo on two guns that can potentially break. What if my AR-15 breaks and my AR-10 runs out of ammo because I split my ammo capacity. It’s unrealistic to be trying to loot ammo in SHTF if you are trying to grab the most popular calibers