I had not heard this before. Is it because the synthetics are lighter than wood would be? I don't have a preference although my husband says I am such a girl because I choose my guns first on how they look, and then on how they feel.Wood but I love old Mausers.Synthetic is better if you are concerned with accuracy mostly.
It will but all it takes is a hairline crack and your accuracy goes out the window as it did with my carefully bedded model 70.Mainly because synthetics are so dimensionally stable and strong. Wood tends to swell and shrink over time, and even may warp, putting pressure on the barrel.
A good glass bedding job will help a lot with that.