I have a couple 7-300wm's too and a pair of 7STW's. That's the benefit of being able to build your own guns. After 20 years of it you tend to of collected a few of them.
One of those 7-300win's is the next one I wanna build. I have a Sendero in 7 RM that shoots pretty good right now. It is kinda my starter long range rig. But when Berger comes out with those 195gr bullets, I want to have something to shoot them. My twist isn't quite enough in the gun I have, although, for kicks and grins, I will buy a box just to see what I come up with, you never know. But then the question is, do I rebarrel my 7 RM with a little longer barrel and an 8-8.5 twist, or build one of those 7-300's. I am ultra nervous about having a rifle built in fear that I will mess up the specs for it and whatnot. I will have to hunt down a dandy of a smith when the time comes. I want to try to find one who has already built one of these 7-300's so that they can give me good input.