JSB has earned a reputation as making some of the finest pellets in the world. They're consistent in size, shape and weight. All those things contribute to increased accuracy. And isn't that the No. 1 thing you're interested in? Developed in cooperation with top hunting airgun manufacturers, the JSB Diabolo Exact .30 caliber pellet is carefully designed, precisely produced and quality controlled so that the result is a very accurate pellet. 44.75 grains results in the perfect balance for the pellet.