Just be sure you go into this with your eyes wide open. This can become an expensive past time real quick.
First - you will want to spend a few $$$ to "accurize" you Win. model 70 to get your groups a little tighter.
Then you will find out you need a decent rangefinder to better calculate the distance to your targets.
Next comes a ballistic app to better determine your dial-ups and windage.
Only then do you realize that your scope does not track well or return to your zero - so a new, better scope is in order.
Finally, you realize the shortcommings of your current rifle and caliber, so you start a custom build in one of those big magnum cartridges.
Once your custom build is done, you spend more $$$ for some reloading equipment for better, more consistent accuracy and to keep your ammunition costs down.
Now you realize that your targets aren't holding up to all the battering they receive, so you need to buy some AR500 steel targets.
Then you start hitting targets way out there....but miss once in a while. Then the idea pops into your head: "if only I had...." and the process repeats itself.
It is a slippery slope my friend. :-)
+1 what he said, in all seriousness it is very much like this. In order to be proficient at any range you need to shoot, shoot, shoot and shoot some more. It is like anything else you want to be good at you have to practice alot. Its getting more and more expensive too. The first thing i did when i got into this sport was buy my reloading components, dies, scales, press, powder, primers, bullets, and a couple of reloading manuals. Find a bullet you want to try and load some cases. I started at 200 yards and didnt leave tell i felt extremely comfortable in my ability, trigger control, cheek weld, and consistent grip of the gun. Dont get to excited about groups at 100 yards either ive seen guns shoot a ragid hole at 100 then be embarrasing at 200.
Main thing is good optics, you have to know when you dial up, down, left, or right its goin to do what you want it too. I absolutely love shooting, theres nothing else id rather do, its a very addictive sport.
There are a ton of people on here who will help you, if i knew any loads for your caliber id help you there but ive never owned one. Im sure someone will come on here thatll help you in that department.