You have no idea how close I've come in the past. My Bro has a Custom Robar .50BMG that is a "blast" to shoot.
I just about sold the Busa last year so I could buy a Barrett M82A1, I was really close. But then $7500 for a rifle that shoots $2 bills downrange? I dunno, it started to make less and less sense.
When you really think about it, there is almost nothing the .50Cal can do that a 7.62X51 cannot do that is at all useful to a civilian, other than impressing friends and strangers. Sure the .50 is a whole nother animal, but in any imaginable civilian defensive scenario .308 makes a lot more sense...
Well that and I cannot ride a Barrett.
I also really want to get an M1 Garand. I love the sound of that "ting"...
Also if we are talking about Survival, TEOTWAWKI? Then I'll be toting around my Ruger 10/22 a couple dozen standard 10 round mags, and few thousand rounds of ammo... Would be a great choice besides, I've put more rounds through the 10/22 over the last 20 years than I can imagine, I can pluck the wings off a gnat at 100yds with the silly thing.