MI VHNTR: thank you for that information and the web-link. Yep, the 40 Super looks a hay of a lot like my 40/45 aka 40 Michaels, but with a slightly longer neck. In the information provided in the link, it provided that a 24 lb recoil spring was used. When I developed my cartridge I used a Wolff 22 lb recoil spring kit, but the only cast boolets I had available at the time were from either Lyman or RCBS molds (170 gn, 172 gn, 196 gn) and the only jacketed bullet was the old Rem/Win 38-40 3/4 jacket 180 gn soft nose that was used for both rifle and carbine.
With my compensated Gold Cup and a 22 lb recoil spring, the newer 155 gn hps would not cycle the pistol. I never tried it without the compensator so I don't know if without the additional weight of that attachment a 24 lb spring was necessary.
Well, at least I know where I can get some decent brass, if I want to use something with a small pistol primer.
Dusty Miller - why do you think the 40 Super (and possibly other wildcats like that) will pass into history sooner than later?????????? Mikey.