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I'm interested in this as well. I only have one Model 7 in a 204 Ruger and mine was making the squeaking as well. I really started to notice it after I replaced the firing pin with a Gre-Tan lightweight one.
Try grease between the shroud and bolt body, heard of aftermarket shouds like above post galling up. Or look for burrs somewhere, had a CZ that had a jam up burr on it, almost lock it up solid.
Wiped off the grease from the lugs, smoothed them up a bit more with 600 grit sandpaper and piled on the Imperial Sizing Wax. Squeaking is gone. Thanks to everyone for the suggestions - especially the Imperial Sizing Wax. I never would have thought to use that.