With factory open sight on a lever action Winchester I'm limited to 75m. The same gun with a tang sight I am good to 225m. That is with very good light. What does not come across is how hard it is to shoot open sights well in low light or super bright light. The last 20 minutes of shooting light I'm only really good for 100m not 225 with the peep sight.

Express sights on my doubles are 75m in perfect light and down to 50m at the witching hour.