Hey sure enough, there is a "dot" machined forward of the lug. Cool. So I have tried a variety of 115 and 124/125 grain bullets all loaded to 1.130 without issue - the finished cartridge goes in to correct headspace, chambers, fires, ejects fine but does not go "blunk" when you drop it in the barrel. And I htink thats fine - that seems to be an out dated test. S&W has very precise engineering. My guess is the barrels are somewhat to tighter tolerances? In any case these are not concerns for reloaders.