How are the 70 grain Sierra MatchKings for groundhogs? I am shooting a 6mm Remington and currently use 80 & 95 grain Red Praire Varmint Bullets from Clint Starke and 87 grain V-Max's. I am happy with all of these but I am always looking to try something new. The majority of my shooting is from 200-500yds at groundhogs. My main concern is richochets. Do the Sierra's bust apart when hitting the ground or will they richochet? Will they give me clean kills on hogs? Thanks!