As the title really. I reload but only straightwall. Never sized a bottleneck. I've found bits and pieces in the web but most of it is necking down cartridges which are already bottlenecks.
How would I go about necking a 45-70/458 win/600 nitro down? Obviously I would run it through a series of dies but how would I make the shoulder form where it needs to be?
It'd need fireforming I'd imagine to get the shoulder angle correct.
I was just playing on QuickDesign and wondered how it'd be done.