The way I see it, you have the 416 Rem and 416 Rigby, both pretty much the same with velocity, +/- 100 fps. (big snip)With the cost of new rifles, it makes a non-handloader lean towards the cartridges guranteed to be on the shelves in 10 years.C F
It's plus or minus 200 fps, if you handload. The Rigby can produce a full 200 fps more velocity than the Remington, while still operating at a lower pressure. I failed to give the Rigby enough credit in my earlier post. Lower pressure interests me more than the velocity difference, because lower pressure rounds tend to be easier to work with.
As far as leaning towards rounds that will still be on the shelves in 10 years, I guess that favors the 30-06, 375 H&H, 416 Rigby, and others that have proved their staying power over the last century or so.
Winchester, aided by the outdoor press, is doing an excellent job of getting a really good ride out of the WSM/WSSM craze. Some of those calibers will still be chambered 20 years from now in factory rifles, but many of them won't. The 30 WSM will probably stick around, just because there's always room for one more 30 caliber in the American market. We'll see if it outlasts the 300 Winchester or not.
I'm sure that the 30-06 will be on gun shop shelves for as long as we have gun shops to go to. The 416s will wax and wane with the times, but the 375 H&H isn't going anywhere. It's too darn good.