Anyone do a .338BR in an AR platform?

[amafrank]

Looking at doing up a .338BR for a friend who hunts hogs. He has been using a 30-221 bolt gun but has discovered that some of the hogs come looking for the shooter and others stalk the hunter. He wants more firepower and quicker followup shots so naturally the bigger .338 round makes more sense as well. I've got a RockRiver lower with all its parts and I'm looking at doing the upper. Any help on gasport size and location as well as loads for the gas gun would be helpful. I've done quite a bit of loading and shooting with the bolt guns but they don't care what the pressure curves are...just whats quiet.

Thanks
Frank