First of all , Singh Sahab is nice person you can trust on this website for purchasing. It's my second rifle from airgunkart. Very fast delivery. Thanks Singh Sahab. Now about AARMR 350 it's real beast in low cost. Indian made rifle giving competition to imported rifles. Awesome power. If you want to zero it after 30 meter you should go with 10-13grain pellets. Because it is so powerful due to that light pellets after 20 meter will be flyer. Due to its powerfull spring recoil is more. But afterall once you get idea and zero your rifle you will enjoy it. Within 30 meter just take any pellet and fire it will rock. Most preferably go with wad cutter flat head. Wooow awesome accuracy with that and don't worry about penetration it will penetrate due to beast power of 350 Magnum.