Things I liked:I upgraded from a Gamo Whisper to the Air Arms S510....night and day. The gun is beyond accurate, super easy to fill and the 10 shot magazine is intuitive and smooth. Put a good piece of glass on top and you will make 50-100 yard shots confidently.
The difference between the two rifles is unbelievable...the pellets actually go where you aim them consistently with this weapons. If you are wondering how accurate this gun is, I would respond with "how accurate are you?"
The power adjustment knob is a great feature. Full power in .22 is very hard hitting and may be unsafe for back yard plinking/pesting. Things I would have changed:Nothing yet...the safety is a little dangerous. It is in the trigger and its a little difficult to toggle back on after firing a pellet. This isn't a problem because the rifle is a bolt action and the chamber is clear after firing (obviously), but, it could be safer. This rifle in .22 is a real weapon and must be respected be its owners. What others should know:The Hill Air Pump works great with the rifle. Takes about 25-30 pumps to go from 150 bar to 200 bar; this band (200-150BAR) will last you about 20 shots at full power. Full power put a pellet clean through an inch thick plywood board at 25 yards in the .22. If you are used to a .177, this gun will surprise you with the drastic increase in power.
Things I liked:I have hit three squirrels in the upper torso at 30 yards. All of them died very quickly and didn't need a second "anchor" shot. The exit wound was vicious. This is the best hunting pellet I have used with my Air Arms.
Accuracy is required, but precise head/heart/lung shot not required for a reliable kill.
These pellets group very well and are deadly. Things I would have changed:Nothing, maybe a larger tin. What others should know:With my Air Arms S510 I have tried:
1) JSB Exact 15.89: Tack driver; however, squirrel heads at 40+ yards are a small target and anything but a true brain shot won't due. I have hit them in the jaw and they run off. No good. Body shots are effective, however, if you aren't hitting in the shoulder blade they will run off. Ice pick like wound.
2) JSB Exact heavy 18 grain: Again, very accurate. No expansion. Precision required for a kill.
3) Predator Polymag: Bad grouping with my rifle. A little light for a hunting pellet.
4) Baracuda Hunter Extreme: Terrible, terrible grouping.