As too your first question, some believe they do others do not, I am of the, they do camp.
As to lead pots, I have the Lee pro 4- 20-pound bottom pour. The main cause for them to drip is dirt and junk in the pot, I weighted the pour stem and the dripping has stopped. But it can be annoying dealing with the Lee bottom pour pots, but the Lyman or RCBS pots cost almost $300.00 more than the Lee.