Cops provide some fertile ground, no two ways about it. I was once dispatched to the scene of a drive by shooting, along with several other officers. I was still a rookie at the time, but already had a considerable shooting background behind me. Anyway, I arrive at the scene to find one of our veteran officers examining the bullet holes in the house. He glances over at me, and states authoritatively, "Yep, looks like a 30-06." Mind you, there were no cases found at the scene. Nor were there any en-bloc clips. Nor had we recovered any, say 173 grain FMJBT M72 bullets that might have lent credence to his observation. Just a roughly 1/3" hole in the stucco of the house, that apparently looked like it could ONLY have been produced by a 30-06 . . . but not a 308, or a 7.62x39. As I said, I was still a rookie, but I learned a whole lot about "police work" right then and there.
They're not alone, either. We once had a body armor salesman who gave a demonstration of his wares at our range. Setting the vest up on a frame, he then moved back to the 50 yard line to do the shooting. As he explained to us, he wasn't going to shoot it up real close like other body armor companies do, but further away "so the bullet has a chance to get up to full speed."
We (or some of us, anyway) were not impressed.