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I observed M20 and HN40 again tonight. My scope wasn't cooled properly and seeing was fair to poor, about 4/10. Transparency was reasonable but being early in the night limiting magnitude was only about 4. Conditions were far from good overall. Scope 10"/F5 Newtonian.
I was able to resolve the "A", "B" and "C" stars very easily. I didn't use less than 120X but the 3 were easily visible at this power. The "D" star was not visible at 180X. At 220X it fleetingly popped in and out a few times. If you didn't know where it was and what it looks like you would probably miss it. The same situation applied at 300X, I caught glimpses of it but it was very tough.
CS-John B
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