I can't comment on the 300 WM in a BAR, but I can on a BAR in .338 WM. It was by far the softest shooting .338 I have shot. Another BAR in 7mm RM would put round pretty much in the same hole at 100 yards. My only problem with them is there safety and the extra noise to chamber a round. If you want one get one. Only you can decide if it works for you or not.