hi there has any body had any experience of a webley tacker 177 fitted with a gas ram .Ive recently bought one in good overall condition however when ive fitted a new telescopic sight ive found accuracy to be inconsistent eg 3 pellets on target then 4 flyers ,all shots taken from a cushioned rest at 20 yards. At first i thought iit could be the scope so i tried the scope off my hw95k which i know to be spot on. Same result 3 or 4 perfect shots followed by a load of flyers i know to solve this its a case of eliminating all possibillities so im guna start by cleaning the barrell if that dont sor