Yerr, I had one in .25, very tight bore (243) and as vm says, only really worked with rhino’s. I shot loads of ferals in factories and rabbits around factory units at night with it. It cost me £99 new and it was really nice and smooth to cock and shoot. I regret selling it really. The lad I sold it to fitted a gas ram and I think it spoiled it in my opinion. I sold my airsporter S at the same time to make room for a Theoben sirocco, which I still have. I thought that the supersport was better than the airsporter in every way. I will have another one day.