fwiw - at our club we've been shooting 200yd rimfire benchrest for years, shooting at a MR-42 center. The top score for these matches is a 200-17X. One was shot with a Win 52, one with a custom rifle, two with a 40X, and I don't know what the other rifle was.
While a good rifle (and very consistent ammo) is essential, winning matches is usually decided by reading the wind and technique.
iow, at that range, a bazillion dollar top-of-the line custom rifle isn't going to mean diddly if the shooter can't read the (changing) wind conditions and doesn't have a solid technique.