Mine like JSB 18.1,the JSB 15.9 are also good.
One more bit. Regardless of what you hear, the Crosman Premiers shoot well in almost all guns. In some, they do the best. In others, like mine, they are acceptable. I mean the JSB are 1/2" at 50 yards and the CPHP are closer to 3/4". I would also recommend them as a starting place. If they are satisfactory, shoot all you can find. No need to spend more money. If they are like a shotgun, time to look elsewhere.