a flat charge to 3200 psi.. The pump is easy to pump except for the last 3 inches of travel...

I weigh roughly 250 lbs and am built kinda stout. I have to stand up and bend my knees to let my body weight compress the pump after the first 50 pumps... he he
I have only set the Sumatra at half power with a full charge and using Beaman Kodiaks 21 gram pellets, I have run about 24 pellets through it and am half way down on my charge. I was told that at full power useing Eun Jin 29 gram pellets that I should get at least 20 good shots.
My reasoning is if when I take the Sumatra out on a hunt, I will take three rotary clips "18 pellets" with me and also take my CFX along. Each chamber holds 6 pellets. Oh and by the way, the 20 and 22 cals are rateded the same as far as flat tragectory and FPE. High is upwards of 60 plus FTE with a full charge and useing the heavy pellets"29gm".
Also a nice feature is that you can load any type of pellet you want. the Sumantra is not fussy. like 6 different weight pellets or shapes. I was told not to use to light a pellet or cheap pellets because they come appart in the barrel. They get blown to pieces before exiting the barrel.. lol
You can read the "Our Take" on the Eun Jin Sumatra .20 cal at Straightshooters. I was gonna get the .20 cal but after talking to them about there being little difference, I took the .22...
Oh the trigger... The trigger is fantastic out of the box. It is two stage and adjustible. Very smooth with definite break when fired. My trigger finger felt right at home..

Gene