One I thought was cool was getting a shot to go thru the first sniper's gun and into his head. It wasn't thru the scope rather it hit the bottom of the barrel and came out the top and hit him right in the head. I've also had a couple of nut shots and explosion shots.
I got to the second sniper. I killed the guys on the ground and lined up my shot. The bullet hit his right hand, severed the fingers and then hit him under his left eye. Nothing like watching severed digits go thru the air in slow-mo.