After owning a Diana 48, I kind of want a 54 now. I'm still working on my springer chops, but I can do a dime at 35 yards. Since the 54 is recoilless or close to recoilless I'm sure I could do better.
Geezer my 48 shoots JSB 15.89 and 18.13 gr pellets very well, it's favorite is H&N Field Target Trophy 14.66 gr in 5.53mm. My advice would be to buy pellet sampler packs, you get a lot of different pellets to try and it saves some money over buying full tins of pellets that your rifle will not like. I didn't do this with my 48 although I was advised to, but I did when I purchased my 37 in .177."Geezer"I just got my RWS 48 last week (the combo package). I have to say I had no idea you could constantly hit that small a target with a air rifle. I was impressed with the overall package.
My only suggestion would be that any gun that heavy should come with sling mounting. I set mine up with a sling this weekend.
When spring comes this year and I am outside again; gofers beware! I have only shot the JSB 15.8 so far, I am going to try different pellets. but I don't know why; the JSB's 15,8 are DEAD ON and repeatable.
The fact Is, I have never owned a "quality" air rifle. The NEW fact is, now that I do, I don't plan to ever be without one! Only problem I can see with this rifle in the future is, Which Grand kid to give it to when I kick off--LOL