Harold,
I like the Green Dot load you cited for clays but with a bit less powder - 13.8. Actually I've loaded this down to 12 gr. for kids and was surprised how well they work on targets.
For 7/8 oz I use Win WSF at 16.5 gr and the 1078-20 wad. I forget the pressure but I think it is a bit over 10,000. You would have to check the Hodgdon site to be sure. I've shot 10's of thousands of these and never a problem. However, not through a Damascus gun but that should not make much difference if the barrels are sound.
Low pressure is relative to bore size. It is tough to get a 20 really low especially with 7/8 oz., at least with published data.
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