TC1,
Kind of a geek out with Ringmans Swarovski experience.
Buying several to get a good one sounds like Leupold engineering ....something to be avoided.
Pig hunting buddie has a 3-12x50 Zenith Flash Dot.
Other one has a 4-16x50 PMII.
I have a collection of 7 of them myself.
Only general rule i've seen is that the bigger objective they have, the better they work in the dark.

dave

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Only accurate rifles are interesting.