Perhaps I am mistaken, but I recall that Rupert shot required arsenic to create enough surface tension to mold quickly, with the dimple caused be contact between still hot (or molten) lead with the water, but it could be produced with a fall of only a few inches, whereas the Drop shot was solid and fairly round when it hit due to being dropped from a greater height (eliminating the need for arsenic, but requiring the construction of tall shot towers). I'm not into playing with aresenic, so I made a bunch of shot from varying altitudes... the higher you get, the more rounded the shot. Tragically, Shot Tower State Park in VA. declined my offer of a living history demonstration there :nono: , so maximum height thus far is about 30 feet... some usuable shot, much misshapen scrap to be recast another day. BTW, Shot Tower State Park in Virgina can provide you with a great deal of information on early shot making, and since the tower is still standing it is a great place to visit.