Yes, agree. I was able to "infrared" two close ones then "freehand' the 3rd one- but it took me almost 1.5 energy bars over 2 days to clear level 38 of region 6- really tough it was.
Spend on an energy drink (it slows down target and increases your reload speed). I think the Special that had hollow shots and 2 energy drinks is now over though- look out for an affordable special with energy drinks and get it.