webley alecto.
its easy close the relief valve, giving you the full 500fps in 22. (i have an alecto 22 and crony).
if you don't want to spend that kinda money, crosman 22 pumpers are good.
same platform;
1322 has pistol grips and a 10" barrel
2289 has pistol grips and a shoulder stock (easy to swap back and forth), and either a 12" barrel with non-detuned valve, or a 14" barrel with a detuned valve. (ones in canadian tire or scopesandammo for sale today are 12", non-detuned).
scopesandammo has various barrel sizes available to get a bit more UMPH, should you desire. i would suggest getting a replacement breech screw if you are going to go that route, for ease of dismantlement.
(1322 barrel band and front sight needs replaced if going with longer barrel, and frame needs spring and pin if you want to put the stock on, if you might do either of these things, just start with 2289 instead)