JSB .177 and .22 pellets come in different head sizes (especially .177). For accuracy, head size matters. Find out which head size shoots best and then buy as much as you need. A great place to get them, as they are usually well-stocked in the many different varieties of JSB pellets, including different head sizes, is the Canadian Airgun Forum Store. (Note: the CAF Store has a "default" shipping price but they charge only the actual shipping. How do I know? I've bought a lot of pellets. Send them an email to find out more.)