Many years ago I had a new 700 rem that did goofy things like your gun.
After a long frustating time, I found that the front lug bolt would not screw into the receiver to provide a good and snug fit. The gun was jumping around inside the stock. It's a shot in the dark,but worth while looking into. I have never heard of a model 7 that didn't perform. Lastly, I cannot relate to your charge of 36 grains of varget. If possible load-er-up some more or try a different powder. I'm convinced it is a simple fix,,,just gotta find the problem.