Actually I disagree to some extent that guns, like my MRAD, aren't quite accurate. Mine shoots like a laser, and the trigger in it is fabulous. I read and researched for several months and looked at lots of different options. Then if you figure that the cost of the .308 barrel is a third of the cost of a new high end gun.....plus you only have to buy one high end scope. I put a Nightforce on mine and didn't have to buy 2-3 scopes for different guns. If you figure in scopes, rings, etc, the switch caliber guns become much more affordable. Ordered a 6.5 Creedmoor barrel thru Wolverine that should be here any day now, so have 500-1800 yards covered between those 3 calibers, and is very nice to pack up only one drag bag to go shoot all day. Plus there are very few of us that can easily find somewhere to shoot longer then a mile.
Not disputing at all though that some of the custom built guns are a bit more accurate, but are they any more affordable? My researching and phone calls to a bunch of different shops and vendors didn't seem to bare that out.
I do love that there are lots of high end .338 rifle options though and it'd be boring if we all picked the same gun. Some guys who have fired my Barrett said it was the nicest gun they've ever fired, and a couple guys were like meh, no biggie at all, so each to his own. Seriously no real wrong answer here with most of the guns being discussed here. My opinion is that you can't really go wrong with any of them.