Here are two examples of the same kind of thing:
The first is a pair of different .357 magnum ammunition fired in the same gun (Remington on the left) and the second is a pair of 10mm reloads also fired in the same pistol (primer type not known).
I've seen this "full aperture sheer" a number of times and while it's not always consistently reproducible, I have noticed it to be a lot more common with Remington ammunition and higher pressure ammunition.