I personally favor a 400 gr LFN, in plain base, and shot at a pleasant 1000 fps, which produces deadly results on game to elk at least. However, 385 gr LFN gas checked has been the most popular weight and style bullet for many years. I should perhaps say, this is most popular after the customer purchases his first mold in a heavy weight. ( You'll understand the reasoning very well after dropping the hammer on a rew rounds in your new gun!)
The WFN has become most popular with customers in the last 8 years or so, and works well, especially if you want to keep recoil down with relitively mild loads. In which case, pick a weight from 350 gr up, to whatever rings your bell the loudest. The gun will throw bullet weights up to 450 grains with massive power, if that's what you bought the gun for. BFR's are well built and will probably handle plain base just fine with any kind of load up to full power, ifyou use one of the LBT lubes. If you intend to use any other brand of bullet lube, you'd do well to order a gas checked bullet, which is also best with LBT lube if you want to wring the maximum possible power from the gun, because gas checked bullets operate at several thousand PSI lower pressure with any given stout load, even with LBT lube. IF you load the the big ones to full house, carry a few bandades along on your first trip to the range. They will stop the blood coming from where the front sight hits your forhead, from running into your eyes and spoiling the sight picture.