What are people's opinions on Zinc bullets?
While pure lead typically has a Brinell hardness number (BHN) ranging from 5 to 15, pure zinc registers at 30 BHN. Even Zamak 3 boasts a BHN of 80. Some have expressed concerns that Zinc may be too abrasive on barrels. However, solid copper bullets, such as those made from Gliding Metal, have a BHN of 80-110. Interestingly, Zamak 3 is approved for hunting in states like California, which have banned lead for hunting.
The photo is a 429303 that supposed to weigh 200gr in lead, but weighs 131.5gr in zinc.