its take,abt 350,then i wud refill as u lose ur pound per sq ft power so 500 is a joke m8,coz the 500 pellet wud just drop out the end,i have the same but i have 2 have a firearms lic as mine is 28ftlb....an its killed a roe buck deer an it wud kill a young person of abt 20/25 even older if u hit them right..

 a cant remember exactly mate ,its not my gun its ma mates,ill find out tomo for ya, a would say at least 200 at 12ft pound lookin at size of it though,cheers ste

 @eastwoods,gunpower claim the 500 not me,never used one of these bazuka lookin things,prefer ma falcons or theoben

 how many shot will it take to get threw that tank?