RE: determining range
This sounds pretty good for hunting scenarios. My criteria for accuracy is reliably hitting a tennis ball at 20 yards and a grapefruit at 40 yards. I get lucky sometimes andshoot a sub 2" group at 40 yards, but it's not something that can be counted on. At 70 yards, I can reliably hit a paper plate; but given the amount of time it takes for an arrow to travel that far, I would try to limit my shots to 40 yards with few exceptions.