What's wrong here?

image.1614561379.jpeg

 
Might likely be the same way JSB also makes their 15.89gr pellets in both .20 cal and .22 cal. The extra weight is in the tail as the dish is shallower on the .20 that on the .22 version.

The .20 cal version is the top one, the .22 is the lower one. Slimmed down to fit the .20 barrel and to get the weight, filled in the rear of the pellet.

JSB 20 and 22 15-89gr pellets.1614631648.jpg