dla, whitworth test a lot of factory loads (handgun round) that shoot extremely well at bfr's place. Some ofthose loads use LR primers. The LR primer is has a much greater force of ignition than a magnum pistol primer and yet he ignores any and all evidence that doesn't agree with his opinion
He is wrong in so many ways
You have no idea what primers are use. Most large calibers like the .475 use LP mag primers and they are needed.
Some .500 S&W brass was cut for a LP mag primer and others cut for a LR primer. Did you know guns have been blown up when LR primers were used in LP brass because a proud primer can fire against the frame.
But you said it right---FORCE! Force not needed, heat is needed.
You have not proven a single time what you say.
