Re: Ruger number one
I have a Ruger #1 in 375 H&H, and if I had the choice between the two cartridges I would buy the H&H again. For no other reason then the Ruger #1 is a classic rifle and the 375 H&H is a classic cartridge. I also think that the H&H will still be around after the 375 Ruger has long been discountinued. With that said; the 375 Ruger will give you 100+ fps more velocity over the H&H, has a shorter OAL, and does not have a belted case. Which IMO the latter two mean nothing, especially in a Ruger #1.
Alot also depends on what the gun will be used for. Like another post mentioned, it wouldnt be my first choice for a brown bear or other dangerous game hunt. If its going to be a Pa. bear or deer gun there is nothing wrong with a Ruger #1 in eigther caliber. I have taken my 375 H&H a few times for whitetail but never had a chance to shoot one with it. I load a Speer 235gr at around 2800fps for deer.
Good luck, Tony