Now it's my turn, I dial in what my dad did because I don't have trajectory chart. I shoot.... nothing 
I shoot some more and finally we get out a target. I'm shooting way low, so I dial up and fire 3 shots at 300 into a 1.5" group After I get everything set right I try another shot and hit one, but it makes it back into its hole. It's my dad's turn again and once again the Cooper wacks one first shot, but it got back into its hole 
We cleared out the close ones, but now there is another at 380 yards and its my shot. I take a guess and dial up six more clicks, wait for the wind to die down a little, and hold off to the side about 3-4 inches. I send the 39 SBK on its way and it just dumps the 'chuck hard 
Here are the two we recovered.
As we were leaving the ranch I saw something move on the skyline of a rim. I yank up the binocs and, yep, it's a rockchuck. I get out and shoot over the hood with the bipod. I put the crosshairs under his chin and squeeeeeze. Another one bites the dust.
As we are headed home we stop at a promising rim and glass. I spot one after a couple seconds and my dad lays down on the bed of the flatbed. He shoots and the Cooper claims the biggest 'chuck of the day.
I've been drooling over one at Sportsman's but they are just to much for my budget right now 
Gary
I'm having a hard time resisting those sweet rifles and will have to go into therapy if I keep seeing pics of them! 
Gary