UNKNOWN
You see, it's all very well quoting from the record, but now you've drawn my attention to the portion that made me think of the question in the first place.  It's patently clear from this, I'll read to you
"It's clear from his own evidence as to the number of cartridges which were loaded and those found in the gun which was taken from him, that he's not being frank in this regard."
So it's clear that there were several shots fired, not just one and that's what the Judge found in the matter.
He's telling us he can't remember firing a single shot.  At the trial he remembered firing one.