[Marcus26]

If it is FITA Field faces then it is worth learning to frame.
If you have a scope it's quite easy

Find the distance in which an 80cm face goes out to the edge of the target on the edge of your scope when aimed at the centre (lets say 50m)
When you frame if you line the edge of the target with the the edge of your scope. If your dot is on the edge of the 4 ring then you are 20% closer. (40m)
If your dot is on the other side of the tarter then you are 20% further (60m)
That then scales down to all the other targets.

I had not shot unmarked fita field in 10 years, spent 30 minutes working this system out and shot 170/180 for a 12 target unmarked. Works brilliantly.