I was wondering why my SIG P226 was leading like a bar steward with "to spec" cast ammunition (.356"). Much to my surprise, after measuring the barrel it is .357" groove-to-groove, i.e. .002" over specification -- and this is a modern firearm! Also, the groove-to-groove (and throat) measurement of my No.4 is .318", whereas "standard" (as if there is such a thing...) is .313", i.e. 0.005" over specification -- and the barrel has no signs of throat wear, so is practically new! Can anyone beat either of those for out of specification-edness?