Interesting trivia... If you're packing a 1911 (I don't currently own one) and someone exclaim's that you are "old school" whilst they have 9mm chambered firearm on their belt -- smile and remind them that the 9mm (9x19) cartridge was introduced in 1902 -- while the .45 ACP didn't come on the scene until much later -- in 1905...
Capt.koolaid -- if I could have an HK P7-series pistol chambered in .357 Sig I would be a very happy man. Rest assured, that I'd buy one as soon as I could. At one time, I contemplated altering an "extra" P7M13 I had in inventory to a .357 Sig by having the chamber reamed out for the bottle-neck cartridge. At the same time, altering the chamber face to accept the .40 S&W case head like exists on the P7M10 slide. It would have taken quite a bit of work -- that I couldn't personally make happen due to the lack of the necessary tooling (not to mention, lack of skill). Also, it would mean cannabalizing a $1900 P7M13 with no guarantee of success....something I just couldn't bring myself to do.
But, the creation of a 10+1 capacity HK P7-series pistol with a "normal"-sized slide chambered in .357 Sig would have been a perfect pistol for me.
(I still have that P7M13 sitting in the safe -- if any readers know of a gunsmith willing to take on the task...)