Those targets are nice but way to easy to nail them. I did mount an iron plate with smaler holes behind the original holes. Starting with 6, 8, 10, 12. and a 14mm. hole. On a day with no wind the 6mm is no big issue on 30 yards with one of my HW springers Cheers Buddy!
This came with a set of reducing plates for each of the holes but even hitting those would cause them to flip close?! Some are far far too sensitive and others reluctant to flip up!