I grew up in northeast phila…in the ’60s we used to melt down solder and fill the bottlecaps to get some really deadly impact into the game. since the twistoff cap didn’t exist, the trick was to get the cap off the bottle without damaging the sides..this let you get the maximum amount of solder into the cap. We ended up making a rule (after some knock down and drag out fist fights) that the solder couldn’t crown over the top of the cap…it had to be flush…to try to equalize the game. My old man was an electrician, though, and the otherkids didn’t know that I was doping the caps with mercury. I would cast the lead around the mercury and my bombers were the B52’s of the block…