Thank's for all your advise i'm on my way to the gunshop as soon as I've sent this! (not the one that sold me the gun) to buy some bore cleaner i've gust phoned him and he's got some 901 in i think he said it was called, he also said every thing you all said so again. Its all hes got at the moment and it's what he uses. It removes carbon and copper. Once I've cleaned it he said he will cast it (is this nessasary?) costs £15.
I don't think I've helped the situation by putting 10 rounds through it every time (Dick Head) Oh well thats what you get from jumping from a rimfire to a centre fir