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A few other ideas.... What about a control scope to check atmospheric conditions? It would be used every test session to see if conditions had changed from one session to another that would affect results. Probably would not have to be a rifle scope, could be a good spotting scope. Record the resolution it achieves each session and see how it varies from day to day.
In industry it is common to test 30 samples to get valid statistics on performance variation. Not possible for scope tests, but if you get a scope that performs much worse or much better than it's peers, test another sample to verify results.
Camera lenses are part of an image forming system, so the resulting image (film or digital) can be analyzed to determine the lens resolution. To eliminate the influence of visual acuity and eye defects, can a high resolution image be taken through the scope? Then the image can be looked at under magnification to determine resolution.
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