I am curious if there is any reason beyond aesthetics for the rounded grip caps I occasionally see on old Mauser rifles (usually Rigby's and Husqvarnas)?

I would also appreciate any photos of rounded grips caps people have on their rifles (mausers or not). I'm undertaking building a stock for a Mauser of mine and, due to my limited stock making experience, the rounded grip seems like an easier way for me to shape the grip than inletting for a steel grip cap.

Thanks in advance.