Andre: I have several air rifles. My favorite is a Webley 1927(?) Service air rifle. These were used by the British Army as trainers since they have a small bolt action that pulls the barrel up against the leather seal. It is a bizarre looking rifle,but of true gun quality. In the 30's,some bird collectors would only use Webleys in the tropics due to their reliability. They have true automotive type piston rings that give excellent seals in the air chamber. The air chamber is smaller than my 1907 BSA's,but the rifle shoots just as hard.
I have 2 1907 patent date BSA rifles,a .117 and a .22(No.1 and 2 bore in British.) They are made of solid steel and are also true gun quality. No sheet metal!!
I also have 2 old Webley air pistols: A senior,and a Premier,which seems to have been a grade higher than the formerly top of the line Senior. I had a mark 1,but gave it to a friend. These Webleys were ALL machined from a billet of solid steel,not made of tubing. They were expensive guns,but worth it. I have 3 Hy Score air pistols from the 1950's. They were the hardest shooting air pistols of their era. They were designed by an engineer who designed fuel injectors for engines. A unique feature is you can lift the barrels just a bit to cock the triggers. Then,you can "dry fire" them without actually having high pressure air damage the pistons since you didn't actually fully cock the gun.
My most accurate air pistol is a 1950'5 or 60's Walther. James Bond is seen holding one vertically in a well known poster. Guess they thought most people wouldn't recognize it was an air gun. It looks like a .22 caliber Colt Woodsman. It has an absolutely hair trigger,and though not as powerful as the others,it will shoot just as accurately as a .22 pistol at 10 meters. A hard gun to cock: The small air cylinder is hidden in the grip. You put a special factory cocking block of wood over the end of the barrel to cover the sharp front sight when cocking. Otherwise,you can't cock it.
Oh,I forgot my 1950's Walther air rifle. A real competition rifle. I think it cost $1,000.00 new. It came with a factory target with 1 hole exactly the size of a pellet. But,10 pellets had gone through that hole! I managed to do that ONCE!!!
It only shoots 600 FPS,but that is the speed most super accurate air guns ,at least,used to shoot at. Extra accurate .22 ammo is also not as fast as regular plinking ammo.
There are other more modern air guns,but not as interesting. The old rifles shoot as hard as my modern Kodiak .22 air rifle. It hits 900 FPS,but,that is in .22 caliber,and not with those light weight pellets that are used in getting over 1100 fps in.117 cal..
Sorry for veering the topic off course,but I know Andre is a competition air gun shooter. I looked long and far,and parted company with some very good size lettuce to find some of these old air guns.