Use marksman pellets .when I was young my mate told me his brother could light a match head at 120 yards with them using his airsporter with open sights so it must be right.. he said that his brothers mates,mate had tuned the gun not with a kit but by using a double ox spring and it was well powerful as it would shoot to page 27 of the yellow pages and it shook with power when you fired it..so going off my mate the marksman pellets sold at the local newsagents for 14p would be the pellet of choice.. or ..any that you have tested that your gun prefers don't forget to wash dry weigh and lube them for consistancy as this will make all the difrance