Longtime Browning bolt action user, but just now stumbled upon this thread.
Formidilosus:
Thanks for the evaluation and write up. I'm glad to see that the test rifle seems to be doing well.
As a lefty who likes tang safeties that lock the bolt down and have less than 90 degree bolt throws for hunting, I've been running a lot of A bolts, A bolt 2s and X bolts since the late 90's; I have them in calibers ranging from 223 through 375 H&H. I've sent many thousands of rounds downrange and killed many head of game with the Browning rifles listed.
By and large they've been great rifles and generally are very, very accurate with a number of loads. As alluded to earlier in this thread, the only real consistent hiccup I've experienced with them is if they get wet and the weather is or turns bitter cold. Between the triggers and bolt design, like some other gun designs, it's not uncommon to get a mushy trigger pull and/or slightly delayed and soft firing pins strikes when its very cold. To account for these conditions, I degrease the bolt and trigger group, sparingly lube with teflon rem oil, and dry fire the rifle several times before loading, which has eliminated any such like issues.
I think it's unfortunate that Browning seems to have abandoned the "Max" stock design that was common on many iterations of X bolt 1. IME, they're one of the better factory stock designs available, and especially so for many of the price points at which they were offered. Instead, they stuck with several McM designs on the X bolt 2's that are more expensive and, IME, not as functional.
Mostly for better aftermarket stock availability, I've been running more and more Tikka actions for the past several years, but I still picked up a few new X bolts in configurations I like. Also, the X-bolts are a great low-bolt-throw, safety-locking-the-bolt-down option for cases that either need or could use more than 3.34.