So I'm looking to purchase another AR, this time in something that i can feed ammo readily available from an online retailer for a reasonable price or from a shop. I have owned an AR chamber in .223, rebuilt it for 5.56, and finally rebuilt it for .300 whisper. I don't mind the .223/5.56 rounds, i just don't trust them for my own personal safety. I prefer something with a heavier bullet. Something about ~55gr just doesn't sit well with me.
I have no intention of getting rid of my .300, but i want something i can stock up on ammo for for SHTF, and shoot for relatively cheap (compared to always having to handload for my .300, as .300 whisper is not readily available)
I have a buddy with one chambered for 6.8, and was wondering if anybody had any suggestions on a new caliber. I will be building this one myself, so I'm not looking for anything pre-built.