Just bought a Browning stalker,trigger is susposed to be adjustable,tried adjusting but doesn' t adjust but less than 1/4 lb is this consistant with them or is this one not working.Will go from 4.5 to 4 lb. with a couple turns of the adjustment screw.This is the first Browning I have owned.Would like to get some info before I fire it so I can send it back if something is wrong with it???