I am a bit predjudiced because I dearly like the .300 H&H. I would say go for it. I have one made by Winchester that I am thinking of doing the same thing. The only draw back is finding brass. It is getting scarce but you can make it from .375 brass fairly easy. Or maybe http://www.qual-cart.com/ can find you some. Having had one I found out early on that it is a handloading proposition.

Buy a factory rifle?? UGH!!! Take a couple of Tylenol and lay down until that thought passes.