New from Mississippi delta

[Delta Shooter]

I'm just an avid deer hunter interested in learning to shoot a little further. I have a model 700 rem 7mm the trigger is 2.5lbs the stock is original and the scope is a leu old vx11 3x9 I use to hunt the hills where 175 yes was a once every 5 years shot to the delta where u better be able to hit a 10 inch pie plate at 600 yds . I'm open to any suggestions. Anyone can give me. I have read a little about mils and moa but don't really understand it. I'm a single father so money will be tight. I'm very curious about what upgrades are out there pluse techniques. I know u get what you pay for by all means. once again thanks in advance and looking forward to hearing from you!

Current stats
Remington model 700
Leupold vx11 3x9 ( thick crosshairs)
2.5 lb trigger
Oem stock floated
Nikon 800yd range finder
Winchester 150gr ballistic silver tip