Currently pondering on the idea of purchasing a hw97 .20 cal. I have read some amazing reviews about the gun itself! I am currently running a Gamo urban .22 pcp that pushes an 18gr about 730fps. My question is will this .20 cal hw 97 get me somewhat close to the performance of my urban? My Main goal is to have the most pcp like springer I can get, and from what I read, the hw97 comes really close with smoothness. Some real world performance numbers of this gun in .20 cal would be great. The website states 850fps but not sure what Grain that is .