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JSB heavy vs mk2

IDK Maybe around 50-60 but mine is the shorty so yours has the longer barrel and air reservoir making it more efficient than mine. I just blast birds at 100+ yards with mine and really dont pay attention to shot count but a fill lasts like forever because every shot is an occasional POOFED birdie or 2 that's about it maybe 5-6 max per session they are ALREADY wise to me. I really don't like to waste ammo unless its CHEAP CROSMAN CPHPs from Wal-Mart.