Had My trusty bsa t10 for a few years it's used weekly and I have learnt the rifle and scope and pellet combo not changed a thing for years it gets served properly by a gun smith as its a work tool for me. I was starting a new tin of pellets so as standard trip to the range to make sure its pellet on pellet zero but rather than my 55yard been 2 mill dot down it was only 1 thought it might have been a flyer so took another shot and same again got my eldest step daughter to try it too and she confirmed it too. The only thing different this time to anyother is the air I got my bottle filled up wi