The Cowboy has a claimed feet per second rating of "up to" 350 fps so I wasn't expecting too much. Right off the bat it hit around 300 fps and kept climbing till it hit just under 320 feet per second. I even went back later after shooting it for a bit and hit got to the mid 320's! I think it just needed a bit of breaking in to hit it's full potential. Read full article here: https://www.replicaairguns.com/2011/4/9/marlin-cowboy-lever-action-bb-rifle-chronograph-test.html