air arms fieds 4.52's. or jsb's. theyre basically the same pellet. 8.4grains. thats a good place to start. my hw100, hw97kt, mpr and my lads s200 all shoot bang on with air arms fields 4.52's. field target trophys are good, rws superfields, falcons. buy a good top quality pellet, or beg borrow or steal as many different top quality pellets off your mates. try them all. some are good, others are excellent. i use air arms in all mine as they are the best in all 4 barrels. start with them and see how you get on. some barrels like 4.51's or 4.53's. ive found 4.52's the best for me. other people will probably beg to differ.