Thanks for that Severnsider.

I have measured the distance where I currently shoot:

54 feet / 16.5 metres / 18 yards

I have a break barrel rifle, being the BSA Meteor. I have been online reading and found that somewhere it says the 6-24x50 scope is too large for the rifle, so now I am wondering what kind of size I should actually look into ...

I am getting seriously into this, even though it's only targets, I like to be dead on with shots and accuracy.