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.
https://www.milsurps.com/images/impo...stuff045-2.jpg
https://www.milsurps.com/images/impo...stuff046-2.jpg
https://www.milsurps.com/images/impo...tuff0461-1.jpg
OK so far!
The rifle. Still loads via clips- no charger upgrade:
https://www.milsurps.com/images/impo...stuff050-1.jpg
And the two different groove diameters:
https://www.milsurps.com/images/impo...stuff047-2.jpg
https://www.milsurps.com/images/impo...stuff049-2.jpg
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????
