For years I've been hearing the same tired old crap: "Don't use the .416 Remington Magnum on a dangerous game safari because it will lock up on you & get you killed."
Do the rules of reloading common sense suddenly vanish when discussing the .416 Remington Magnum?
You develop & test your loads for the environment you intend to deploy the firearm in WITH ANY CALIBER.
A load developed for deployment on an African Safari with 100 degree + average temperatures & a load developed for a backup gun to be deployed in Churchill Falls, Canada as a Polar Bear backup gun in the winter using exactly the same components would probably call for different powder charges as a given maximum powder charge developed for the cold weather environment would likely generate excess pressure in the hot environment & thus result in difficult extraction.
Without thorough in the field development & testing for each specific situation & firearm/caliber selection the above paragraph is nothing but guesstimations & generalizations but the principles are well established as factual.
In a nutshell a load has to be developed & thoroughly tested for the environment it is to be used in.
I own 2 x .416 Remington Magnum rifles & have used them just about everywhere & have never had a problem because I exercise due diligence as regards
environment specific load development & testing with all the firearms and calibers I own.
If this nonsense was spread intentionally to "kill" a perfectly good caliber it did a heck of a job because it's hard getting rifles, ammo & reloading components for the .416 Remington Magnum. Finding new brass for the .416 Remington Magnum is next to impossible.
Way to go rumor mongers.