Hi Ade. Try steel BB shot, too, or darts (much more fun with a Gat, anyway), as housing low-grade smooth bore barrels as they do, pellets are erring towards the pointless with these pistols, anyway, especially as it sounds like an array of foreign bodies may have been fired through your example in the past, which may similarly have distorted the barrel liner (as a boy, we used to use scrunched up bits of tin foil as ammo, which once wedged in by the screw-in loading pin, would often jam and have to be reverse pushed out with one of my Gran's old No.8 knitting needles, lol )?