a friend asked me to try zeroing a hatsan striker .22 he is a shooting man but with shotgun and had no joy zeroing it.....I fitted a cheap scope and set a target at 30 yards ....using gamo pellets ....because I have a load ....I got in the end a terrible group of about 3" switched to rws hobby and although the group was high reduced to 1.5 " ....I has a very harsh firing cycle has anyone else had experience with this rifle if so did you achieve good groups and with what pellet