Pumkins are mostly hollow. That is why the bullet passes right through them. Fill your pumpkins up with water next time and see what happens.We've shot watermelons before and they explode like their was a bomb in the middle. It's their water content. The bullet going 3500fps displaces the water to the sides at an incredible weight. Try it some time. You won't be disappointed .

I found a watermelon shot with 30-06on Youtube. I can't access it at the office, though, so I didn't watch. Here's the link.

www.youtube.com/watch?v=4rAvO49-TXQ&feature=related