I shot IHMSA for many years, including some night matches. Used several revolvers with open sights, TC Contender/Encore's, Wichita's, XP-100's, all with both open sights and scopes. The firing line was lighted and that helped with seeing the sillies, and I used a sight mod I had used years before with the open sights. Way back in the 60's/70's I shot rimfire sillies at a private gun club, not sanctioned and sillies of our own design. Mostly I shot semi auto's, both with open sights and scopes. For both day and the few night shoots I used white outline rear and white post front for the open sights, and they worked good enough even just by moon/star light - it was the sillies that were hard to see as the range was not lighted. Just part of the challenge IOW. I also opened up the rear sight blade a little to make it easier to see the front and rear separate from each other. Had younger eye then though, probably wouldn't work as well for these old eyes now days.