Couple days ago I found half a box of factory Hornady Vmax in .204 hiding in the back of the safe. As I was going out to zero a new batch of hand loads and thought why not finish the box of Factory stuff off as it must be 10 years old by now.
After sighting the new batch of hand loads, the barrel was pretty warm and I loaded the first factory round.. BOOM,!.. that was louder than normal? Ejected the case to see a big split down the neck. next three factory rounds were fine.
Neck split didn't seem to effect accuracy. Four shot group at the center dot is the factory ammo.