Rafsob
They are brass bullets and they are designed to work that way. They are very new and I was concerned about how the would work but not any more; that deer staggered for 25 yds [about I did not measure] the damage was awesome and it had 26 inches of penetration to go with it. They shoot better than any thing else in my triumph and my Endeavor. No other bullet ever gave me half inch groups with any regularity. They are expensive but very good.