I found that a 1" sticker with a smaller P.O.A drawn in the centre worked well for me at 80 yards but I did put it on a piece of plain white A4 so I could see any P.O.I outside the target area . I could still see this target equally well at 100 yards but hitting it was a very different matter . I'm new to shooting ranges outside my max hunting range of 50 meters but as already mentioned your target size will be down to you and your equipment . Too small and you will end up feeling frustrated , too big and you will get bored . Atb Ricky