Gew 88/05 "S" Marked Barrel Specifics?

[jmoore]

Just to let you see that I don't just make all this stuff up, here's the first Model 1888 that I measured:

First, though, a caliper test on a random, but handy ring gage.




OK so far!

The rifle. Still loads via clips- no charger upgrade:



And the two different groove diameters:





It must have the one I checked last, as the readings are the same as the pervious post! Probably 2-3 years ago- why do I remember such junk????