I am getting back into pistol shooting after a long break and I want to pick up a funnel-type target holder/pellet trap for safety.

They are available in two different sizes - 14cm X 14cm and 17cm X 17cm...which one should I get for UK competition 10m pistol targets...?

Also would the 6 yard competition pistol targets use the same size target holder...?

Cheers for any guidance.