A group of local enthusiasts of squash artillery are going to try to find out when they attempt a world record. These things are generally really big air guns. They are making their attempt in Utah, in hopes of taking advantage of the thinner atmosphere at elevation to get better distance. I guess that’s what they have to do now, is go for elevation, since at 700mph, you’re pushing the sound barrier. I can’t imagine pumpkins would survive intact because of the supersonic shockwave.