I've never seen a leaded telescoping baton, but you might want to reconsider the fixation on weight - because strike damage depends a lot more on the angle and targeted zone. If the cops are getting anything like the military in training on these things - they spend a lot of time learning where and how you can hit somebody without risking permanent damage. I'm pretty much the last person to stick up for cops, but beating somebody with a baton is hard work - so I'd be more inclined to think the cop dealing out the blows is trying harder than his fellow officers to not shoot a person to death.