Hi Thach, It was nice enuff outside to piddle about alittle bit and I came across my targets I shot with the R9. Best Groups at 25yds were with pellets,(JSB EXACT JUMBO 15.89, dime covers the 5 shot group), (JSB Straton 15.9, dime size 5 shot group), (Crosman Piranha 14.3 gr did well) , ( Gamo Rocket did well, this pellet has a BB in the head of the pellet,very good for penetration), JSB Hades 15.89gr,dime size 5 shot group), (JSB Monster Redesign 25.39gr 5.5mm did surprisingly well given how heavy it is), ( H&N Terminater 16.36gr, nickel size 5 shot group ), ( AirArms 16gr did well), ( H&N FTT (Field Target Trophy) 14.35 gr 5.55mm did very well,Probably the tightest group,easily completely covered by a dime, the other 2 sizes 5.4mm & 5.3mm did did very well but the H&N FTT 5.55 grouped the best of the 3). ( JSB Exact 14.35 5.5mm is tied with the H&N FTT 5.55mm). Other pellets tried were H&N Silver Point 17.3 gr Big nogo ), (AirArms 18gr nogo), (H&N Baracuda Match 21gr not bad,nickel size group), (JSB RS 13.4 gr 1" group), ( H&N Spitzkugel 16 gr did great 1 session and then fell off the next time out), ( H&N Sniper Light were a big nogo). ( Crosman Premier Pointed 14.3gr just covered by a quarter). (H&N Excite nogo). ( And finally the Gamo Red Plastic tipped pellet was a nogo ). Found a couple more targets,lol. H&N Barracuda 15 did pretty good, a dime size group with 1 opening it up just a smidge, that could have been me. (FX 15.9 was a nogo) . ( H&N Barracuda 18 gave a quarter inch group ). ( H&N Sport wad-cutter was a nogo). (H&N excite gave a half-dollar group size group). ( Falcome Dome 13.43 did well). ( RWS WadCutter Meisterkugen 14gr did really well but 1 opened the group to a quarter). That's it,finally! lol. I seen where you had gotten another barrel for your R9. Where did u get it from (Air Venturi ?) I have'nt gotten around to polishing the barrel yet. I can't find that polishing compound I have. When I do I'll let you know if it has helped any.