And we've all seen how many documented or reported cases there has been of that...

(failed ejection of belted cartridges.)

By my informal questioning, I've come up with exactly zero that have heard of or seen a belted cartridge slip by the ejector. Of course, I welcome the opportunity to stand corrected if anyone can point to a specific case in which this has happened.

Personally, I still believe this stems from John Taylor's writings in which he identified the theoretical scenario in which it could happen.

I've got DRs in 470 and 375 Belted, so I've got no beef either way... both of mine work fine.

PS - before the pressure argument gets going...

Kynoch loads their Belted at 19.5 tpi (max)
and their flanged at 18 tpi (max).

Seem minimal to me and I bet your gun would never know the difference either.