Simple Yes or No will suffice, but if you want to explain your position you're more than welcome. Q: Are pinned Scope bases on round or multi-flat actions (Remington, Savage, Winchester or custom) necessary? No, I don't believe so. Whenever I true an action I mill the screw holes dead center for mounting screws with #8-40 threads. In doing so, I align the holes in most instances more true than they were from the factory. The screws I use have a tapered filister head as seen on weaver/leupold screws and a Torx socket. The tapered head will center the screws within the tapered hole in the base, while the mating surface of the rail will keep the base straight side to side on the action top. The only place I see pinned bases needed, is on a flat top action, with flat bottom bases.