about this dont paw with the jab stuff...i think it should be mentioned that if you are confident in doing it, and you are aware enough of the risk and reward, there is really nothing wrong with it. i am a southpaw and my range with my right hand is my strong point, i dont need to paw to find range, i paw to get the other dudes hands moving and voila, openings are made. its no different than any other tactic of baiting your opponent, you just gotta know you are doing it and have the proper response plan. so dont necessarily assume its a bad thing. i knocked a dude out that outweighed me by 60 pounds with 18 oz. gloves and headgear on simply because of pawing and drawing.

as far as finding your range. dont even use the heavy bag, use the double end bag. just jab it all day until you feel you know what it's doing, then step away from it further and jab from long range, then close the gap and jab from close in when it is going away from you...much more practical range finder than the heavy bag.