Kent Impact is tungsten matrix and does act like lead (some what) and is a good shell. I use it in vintage fowling pieces instead of Bismuth. In newer shotguns I prefer Hevi-shot , and for waterfowl a choke with 700 consriction and shot load of 1 1/2 oz. The reason Impact workes like lead is polymer mixed with the tungsten. Other tungston alloy are not as soft. I have found no other shot that patterns as well as Hevi-shot .!