273 302 318 340 build

Ok so top 2 ring side clearance measured 0.003"-0.0035" for top ring. 2nd ring measured 0.0015"-0.0025"

Bottom rails are harder to measure as they should be installed to measure?
Suggestions how to measure?
I get 0.003" but it requires some effort. These don't slop in the grooves like the top 2 rings do.
Thanks.

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