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That was an assumption on my part, of course. Hand loading is the only way to go for any of these. 300H&H has been around alomost 100 years, whereas the other magnums, at the oldest, around half as long. Lotsa guns out there chambered for it, and actually only a little harder to find ammo for than a 300 WM.
Pick up your speer book(or any other) the 300 H&H delivers better velocities with less powder, powder for powder, bullet for bullet, apples to apples. In spite of it's tapered case it is still one of the most efficent cases out there. It also relies on the belt for headspace, not the shoulder like all of the others mentioned here. Full length resizing not needed, brass lasts longer.
I also have to point out that the 300 Win Mag has many more ammo choices available.
That said, I am a handloader and have a soft spot for the 300 H&H. By handloading you can make loads that will leave the 300 Win Mag lagging a bit. I'd not hesitate to have a 300 H&H in my gun rack.