I have several thousand of the Winchester and Federal 158 LSWHP +P rounds in my ammo safe. After reading the comments on this thread, I checked all the ammo. All were crimped. All of my Model 10s, 15s, 64s, and 65s shoot this ammo very accurately. Over the past 40 years, I have found only a few quality control problems with factory ammo. Most were replaced quickly by the manufacturer after contacting them about the problem.