HERE is a pretty good explanation of where to shave the stock, courtesy of Surplusrifle.com. After he fits the rifle into the stock, there are several illustrations with areas highlighted thqat might need some reduction. According to the write-up, figures 8 & 9 are supposed to be the most significant areas, but I'm a rank novice.
Now, I suppose it takes someone who knows the heck what he's doing to properly diagnose and treat, doesn't it?
Right, then. Bash on!
Bob