Great call! Dick is right, no matter what brand of rifle it is, and no matter how good or bad it shoots, you can always make accurate reloads for it, and if that still doesn't help, letting a smith tinker with it will definitely help you out. I am not a Winchester fan....HOWEVER, that being said, the Model 70 can be made to be a tack-driver, with a fairly minimal amount of smith work, and a good barrel.
You will enjoy reloading. Like Dick said, at first you will be nervous about what to do, and where to get started. In time, you'll become very comfortable with the process.
First steps I did was figuring out the right settings to sonic clean and tumble-polish my brass I had been saving for years, and for how long to leave them in there. Looking back, if I were to do it all over again, I would just go ahead and get the Stainless Tumbling Media setup and be done with it. I'll probably end up buying that next year. For what I spend in sonic cleaning solution and tumbling media every couple months, it's worth it just to buy the Stainless setup and only have to buy cheap LemiShine and Dawn dish detergent for the stainless tumbling media setup from now on.
Buy reloading manuals for every brand of bullet you plan on loading for. Learning the right way to do things is key.
If you need tips, go to YouTube and look up IraqVeteran8888 and his basic how-to getting started reloading video. It's like 16 mins long, but all his videos are REALLY helpful.
Also, since it's a 7mm RemMag (one of my main calibers I reload for ALOT), if you ever need any advice or have any questions regarding the caliber, or load data, feel free to ask me anytime. I'll be more than happy to help.