Well you have a good quality gun so don't destroy it!
I wouldn't go any lighter than 14gr but your sweet spot will be 15-17gr. Buy decent pellets, H&N or JSB are my two best pellet brands that perform well try out the JSB Hades .
For cleaning you should only need to push a rod and patch down once every tin of pellets you shoot (250ish shots). Never use brass Brushes to clean your air rifle barrel or you will ruin it and loose accuracy ( @kruza will be able to explain this for you?)
Forget about non toxic / green pellets they just aren't worth it, I've and others on here handled thousands of pellets and never got lead poisoning.......
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