It is claimed that the 22 caliber is THE most popular caliber in airgun use today. There is plenty of reason to believe that. The weight range of 22 cal pellets is impressive. Cost per pellet is also substantially beneficial versus their larger caliber counterparts. The recent increase in power of the guns has expanded the versatility of this caliber with slugs and monster redesigns. Both in target and hunting. Their economical nature versus the 25 caliber also elevates their standing with both pellets and slugs. I prefer 25 caliber, but 22 caliber has made big advances and I'm gaining new respect for them.