I just recieved one for an upcoming build, its like a bank vault, its tight and smooth like nothing I have seen before. mine has the built in rail, so its a bit heavy for a hunting rifle. the regular actions aren't so heavy, so if weight is a concern you might not get the built in rail. I figure I am probably adding about 4 oz by going with it, but to me the extra stiffness in the action is going to be what I want.
Ihave bench buddies that hunt with them. Some other friend of mine just got their rigs this yr. love em, 300 wins, the one rifle took a 386 bull, and loaned it out and took another 7x7 about same caliber
BAT actions are AWSOME. If you are building a hunting gun, you do not need to get a big br type action like the "M" 1.55. Bat makes 1.35" remington style actions that are repeaters. That would be the ticket!!!!
I am by no means an authority. But, I just watched Gordy Gritter's DVD where he chambers a barrel for a BAT action. Some of the tolerances he mentions suggests to me that one might build the rifle with a little looser tolerances to allow for dirt etc.. in a hunting rifle than you would for benchrest. I don't see why you couldn't use the BAT action. But, the setup might be just a little different.