I have a friend who has a .416 Rigby. I neither own a .416 nor have used one. If I thought I wanted one I would pick a preferred rifle than the cartridge unless ammo was a problem.
I would not worry about the pressure. I am sure that the Rem is safe, and I don't really care about pressure or efficiency if the rifle and cartridge do what I want.
Based upon the posts that indicate that the .416 Rem ammo is more available, I would choose it. I suspect also that a good rifle for the .416 Rem is more available, less expensive, maybe a little less cumbersome due to the use of a smaller action.
FWIW chamber pressure has nothing to do with recoil. Recoil is derived from momentum.
Regards,
Jerry
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Ecclesiastes 12:13 ¶Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.
14 For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
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