Maybe I missed it, but I don't remember anything being posted that stated that the problem ammo was Weatherby brand.
I don't remember seeing it on this forum or the Wby. forum. Does anyone know for certain that it is Weatherby brand ammo that is causing the alleged problems?
IIRC the issue with redlined ammo was "for" Weatherby which would certainly imply "their" ammo. While I know there are several factory loadings for the .300 Wby the only company I know that has loaded Wby ammo "for" their line of cartridges in quite a while is Norma.
Others may know more and can chime in.
If there's one thing I've become certain of it's that there's too much certainty in the world.
