So far I'm happy with the Labradar but it does have it' catches.... As MD pointed out, 17 cal.. forget it. So Far anyway. Mine picked up a 17 once out of three shots. It read the one it caught accurately but doesn't work well there.
22's havn't been a problem but do not get the readings much past 50 yards. 6.5's I've gotten readings out to 125 yards.