I have a Northshore barrel's custom on a Remington 700 action. I have been getting good results with both 110 and 220 rounds.
It is a heavy sucker and I would not be taking it hunting. Plus I am just not sure how lethal it would be at longer (100 yard plus) ranges.
It is fun to take to the range and watch the fudds when I unpack it. Then when you shoot sub sonics they really get their knickers in a bunch.
Is it worth the 1400.00 I have into it? Probably not. But I do enjoy it.