Hi there, I have just bought what looked like an immaculate one of these from Holts. I took it to my local gun club last night and......oh dear. its barely pushing the pellets half way don the barrel. On re-cocking and firing the pellet will leave the barrel just. Looking at it here are the details:.177 SINGLE-STROKE PNEUMATIC AIR-RIFLE SIGNED HAMMERLI, MODEL '450', serial no. 0504131. Can you still fix these rifles? Probably the seals as it appears to have come from Switzerland or germany from the various labels on it. Any help gratefully received, not worried about the cost. Externally it is immaculate, I would just like to use it for 10 metre target shooting. many thanks,
raytheham@gmail.com