G'Day Fella's,

Mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm Donuts!

A Dumb Question, from out of the blue;
Q) Is the .450 Rigby, basically the .416 Rigby case, necked up, or a different parent case?

I could go and Google this info up, but if any of you good folk, have the spare time explain this Q, I would always prefer to hear this from you.

Best regards
Homer.