That might be what your looking for,
A few suggestions;
The Surgeon xl with the AI mag will only load a cartrige to 3.625" OAL, that is pretty limiting in a 300 rum. Unless your planning single shot. The action is heavy and needs a 1.350" barrel shank as well. Still a great action. The one pictured weights in at about 15 lbs without optics.
The Surgeon RLR with a Seekins mag or a wyatts box will get you to near 3.900" OAL. This will allow the 200-210 to seat out of the case capacity, not that your going to need it all anyway. The RLR is Surgeons long action mag remy clone with m-16 extractor and the Surgeon one pc bolt. With a 28" barrel you should be able to drive the 200 grainers to 3100 fps. My 30" rum does 3150 with a less than max load.
With a medium palma contour, or a number 6 contour barrel, with optics you should make your 14 lb limit.
Unless Boots is your uncle, you might have a hard time getting a barrel from his shop right now.
I would brake a 300 rum at 14 lbs. but that is dependent on weather you feel the need to spot your shots, and can stand the punishment.
Good luck with your build.