How about a 440 Corbon. It is a 50 AE case necked down to .44. You get the case capacity of the 50AE but the bullet selection of a .44. Factory loads run about 2100fps.[img]http://photos.ar15.com/ImageGallery/IG_LoadImage.asp?iImageUnq=11397[/img]
Looks like a 357 Sig on steriods to me!
I also have two consecutive TROMIX lowers and an additional 4 consecutive available to the purchaser.