good question and its different for everybody ..,for me.. Im not to the point of only buying the favorite pellet of a particular gun ,,,ive got the FX,, WC and IMPACT also the RAW HM1000X 30and 25 cal.so i keep there .the ammo they like best but love the idea of variety, so at this time of only 1 year into PCPs,i have got approx 160 tins of pellets on hand ,on a good day with my youngest boy,hes 9 and my shooting partner ,loves to nail those spinners and has picked up on how to do the little things from setting parallax and knowing about cant to getting a hang of using the eye box we have shooting sessions that have lasted 5 plus hours ,so we have shot up to 10 plus different kinds of pellets in one session and have gone through a 1000 plus pellets in one session ,,so i just checked my stock bought acct at AGD and theres a splattering of 24 ,20 16 12 tin purchases so yeah i try to take advantage of every savings i can always ibought in numbers of 4 hynzie