As said crosman 2240, Benjamin/Sheridan eb22/e9a etc
I have a crosman 150 that packs a punch
Also older ones as Baz mentioned Schimel and S&W 78g
..and with a simple little modification the 1377 pumper goes right up to 6ftlbs.
Not really, the 1377 is a knock open valve, not a blow off valve - such as the one in the Sharp Innova - so it doesn't put any extra strain on the trigger when you sort the power out.
Some people put a heavier hammer spring in which does spoil the trigger, but since the standard hammer spring is strong enough to dump all the air in one go there is no need whatsoever to do it.
I did a thread on here a few years ago on how to restore the new Gen III guns to their proper power potential - basically it just involves blocking a bleed hole and taking the TP out slightly and that's it. No need for flat top pistons, hammer springs or any other nonsense.
OK got that wrong then. I was thinking of the old Crosman classic .22 pumper I had in 1980. Let's just say we didn't have chronos then, I just 'tuned' it.
A shooting bod at the halls of residence was amazed that I could hit and break a milk bottle with it at a distance of [thinks carefully] 40 yards. From memory I'd guess the trigger weight was about 20-25 pounds.
The seals never lasted last long when I had them.
BTW the bod had a shotgun in his hall of residednce room's wardrobe - all legal apparently.
P1V1overT1=P2V2overT2
You're right, Crosman changed from blow off valves to knock open valves, but I'm not sure exactly when.
That old pistol of yours self cocked when you pumped it I think/ - it was one of the early types. They used the same mechanism on the rifles such as the 140.
Overall I think the knock open valve is better, it's more reliable and doesn't suffer from heavy trigger syndrome.
The Crosman 1377 & 1322 had better triggers & used the knock open valve, the earlier 1300 had a blow off valve & the trigger pull got heavier the more you pumped it. They also had an annoying habit until they were run in of the quad ring valve not seating properly. This could lead to you firing & upon pumping up again the gun could occasionally discharge prematurely.
I have seen this happen on two 1300's of similar vintage. It is very sensible never to load a pellet & close the breech until after you have pumped it up.
While using mine about 45 years ago I had put one in the breech & was pumping it up. The swing of the handle was such that the side of your hand can go across the muzzle when pumping. At approx 10 pumps it went off & plugged me in the palm at the base of my forefinger. Didnt half sting i can tell you!
I had to pull the .22 pellet out with tweezers.
I never pumped a 1300 with the breech closed & one up the spout ever again!