I've got a small stash of #1 that I'm keeping just for HD because it's just so devastating but I was unaware of the previous discussions regarding strays.
That being said, I did notice the possibility when I patterned my 1301T...
Even at 10 yds you can see one pellet from each shell is starting to go its own way.
At 25 yds I got one very low flyer from the first shot but the second shot stayed relatively tight. So yeah, some inconsistency is definitely a possibility.