Done it both ways and gave up on the barrel. We just use logs to form a v for the shot we want. We moved to a thicker area and we get crows, but not enough to make a difference. Use to be on the edge of rokslide and I swear every crow in North Idaho took its share! I think crows calling is actually helpful though, consistent crows calling equals food for most predators. I would think the math is pretty easy-do the crows eat more than the weight and hassle of packing a barrel? Are you packing on your back or do you have four wheeler access? We are all on our back, so that is an easy choice!