I've been doing a lot of reloading lately, and also have some new acquisitions which I am getting the required die sets for. One will require two different die sets, and while browsing through an old COTW, I found the '44-357 Davis' cartridge listed. It's practically the same as my 357 Automag/44 S&W Magnum wildcat. Both differ from the 357/44 Bain & Davis by not having the long tapered neck.
I can't find any reference as to why the 357/44 Bain & Davis had the tapered neck. Extraction was never a problem, even with Jim's hot loads. Maybe just to make it different???
Just goes to show that great minds think alike. Separated by 30 or 40 years, but the same basic idea.