The .20 is an interesting caliber for air rifles. Beeman seemed to think it was optimal - a large enough pellet to have decent weight and a longer profile for better BC's. I think he was right, but it really never seemed to catch on. Beeman and Sheridan were the only readily available .20's and most places still do carry a tin or two of .20's but they tend to be a bit more expensive and the variety of pellets is very slim unless you buy them on the internet. I'm seriously thinking about getting a new R-9 but I think I'll go with the .22. The larger diameter is better when it comes to killing with a low KE gun in my experience and the availablity of ammo along with the price has me leaning that direction. Last check at Sportsmans they had one type of .20 cal @ $11.95/500 and 4 types of .22 @ $8.99 /500.
