Best advice you'll ever get when it comes to learning precision long-range shooting: Start with something cheaper than .300WM. Those guns are chambered in $3 bills.
Find yourself a decent bolt gun in .223 and you'll be set for ~600yd. with that, which isn't a cake-walk for a beginner. From there, work your way out. You can spend all day shooting/learning on something like a .223 vs. wasting your money on .300WM rounds that are gonna cost you a fortune.
BTW, what scope are you running? @ ~$600, you just start to get into the 'decent' area in the realm of scopes, IMO.
My general rule of thumb is to spend at least as much on the scope as I did the gun, pending funds.
:masturboy:
P.S. - Is this your gun? Someone elses? Pics of said gun?