On the Rigby vs Remington issue, I'd say 10-15yrs ago, the common perception was that you could find Rigby ammo on the other side of the pond a lot easier than Remington, so no matter which one they preferred, having a ammo was favorable to getting overseas and having your ammo not make the trip, so guys bought the Rigby. So that bolstered sales of Rigby's, even if guys thought the Rem was superior (my vote was Rigby either way).

I don't think those rules apply today. Getting ammo to your destination is a lot more reliable, and I think .416Rem has gained enough popularity that you could get ammo either place.

For what it's worth, I have heard a parallel thought process that guys should never reload ammo for their 'African rifles', because if your ammo doesn't make it, you'll be stuck with factory loads available, so you should just shoot and zero to the factory fodder. It's sound logic, but I think it's better to just plan your trip effectively enough to get your ammo there, no matter what you're shooting.