Pure Tin runs about 2/3 the weight of lead which is why tin shot never really took off as a replacement for lead shot. Tin's density is about 7.28 g/cm3 versus lead's at about 11.34 g/cm3. Most of the magnum grade lead shot I have read about runs about 10.5 to 10.7 g/cm3 due to having antimony added as does copper or nickel plated lead with their respective plating. Pure Bismuth runs about 9.80 g/cm3 and mixed with 5% tin drops the density down to about 9.7 g/cm3. I am going off memory here. I have no problem shooting the 95%/5% Bismuth /Tin alloy either in shot form or round ball. It is about as close to lead as you can get without going the tungsten route. Have a nice weekend.